Provided by: youtube-dl_2017.09.24-0.1_all bug

NAME

       youtube-dl - download videos from youtube.com or other video platforms

SYNOPSIS

       youtube-dl [OPTIONS] URL [URL...]

DESCRIPTION

       youtube-dl  is  a  command-line program to download videos from YouTube.com and a few more
       sites.  It requires the Python interpreter, version 2.6, 2.7,  or  3.2+,  and  it  is  not
       platform  specific.   It  should  work on your Unix box, on Windows or on Mac OS X.  It is
       released to the public domain, which means you can modify it, redistribute it  or  use  it
       however you like.

OPTIONS

       -h, --help
              Print this help text and exit

       --version
              Print program version and exit

       -U, --update
              Update  this  program  to  latest  version.   Make  sure  that  you have sufficient
              permissions (run with sudo if needed)

       -i, --ignore-errors
              Continue on download errors, for example to skip unavailable videos in a playlist

       --abort-on-error
              Abort downloading of further videos (in the playlist or the  command  line)  if  an
              error occurs

       --dump-user-agent
              Display the current browser identification

       --list-extractors
              List all supported extractors

       --extractor-descriptions
              Output descriptions of all supported extractors

       --force-generic-extractor
              Force extraction to use the generic extractor

       --default-search PREFIX
              Use  this  prefix  for  unqualified  URLs.   For example "gvsearch2:" downloads two
              videos from google videos for youtube-dl "large apple".  Use the  value  "auto"  to
              let  youtube-dl  guess  ("auto_warning"  to emit a warning when guessing).  "error"
              just throws an error.  The default value "fixup_error"  repairs  broken  URLs,  but
              emits an error if this is not possible instead of searching.

       --ignore-config
              Do  not  read  configuration  files.   When  given in the global configuration file
              /etc/youtube-dl.conf: Do not read  the  user  configuration  in  ~/.config/youtube-
              dl/config (%APPDATA%/youtube-dl/config.txt on Windows)

       --config-location PATH
              Location of the configuration file; either the path to the config or its containing
              directory.

       --flat-playlist
              Do not extract the videos of a playlist, only list them.

       --mark-watched
              Mark videos watched (YouTube only)

       --no-mark-watched
              Do not mark videos watched (YouTube only)

       --no-color
              Do not emit color codes in output

   Network Options:
       --proxy URL
              Use the specified HTTP/HTTPS/SOCKS proxy.   To  enable  experimental  SOCKS  proxy,
              specify  a  proper scheme.  For example socks5://127.0.0.1:1080/.  Pass in an empty
              string (--proxy "") for direct connection

       --socket-timeout SECONDS
              Time to wait before giving up, in seconds

       --source-address IP
              Client-side IP address to bind to

       -4, --force-ipv4
              Make all connections via IPv4

       -6, --force-ipv6
              Make all connections via IPv6

   Geo Restriction:
       --geo-verification-proxy URL
              Use this proxy to verify the IP address for some geo-restricted sites.  The default
              proxy specified by --proxy (or none, if the options is not present) is used for the
              actual downloading.

       --geo-bypass
              Bypass geographic restriction via faking X-Forwarded-For HTTP header (experimental)

       --no-geo-bypass
              Do not  bypass  geographic  restriction  via  faking  X-Forwarded-For  HTTP  header
              (experimental)

       --geo-bypass-country CODE
              Force  bypass geographic restriction with explicitly provided two-letter ISO 3166-2
              country code (experimental)

   Video Selection:
       --playlist-start NUMBER
              Playlist video to start at (default is 1)

       --playlist-end NUMBER
              Playlist video to end at (default is last)

       --playlist-items ITEM_SPEC
              Playlist video items to download.  Specify indices of the videos  in  the  playlist
              separated by commas like: "--playlist-items 1,2,5,8" if you want to download videos
              indexed 1, 2, 5, 8 in the  playlist.   You  can  specify  range:  "--playlist-items
              1-3,7,10-13", it will download the videos at index 1, 2, 3, 7, 10, 11, 12 and 13.

       --match-title REGEX
              Download only matching titles (regex or caseless sub-string)

       --reject-title REGEX
              Skip download for matching titles (regex or caseless sub-string)

       --max-downloads NUMBER
              Abort after downloading NUMBER files

       --min-filesize SIZE
              Do not download any videos smaller than SIZE (e.g.  50k or 44.6m)

       --max-filesize SIZE
              Do not download any videos larger than SIZE (e.g.  50k or 44.6m)

       --date DATE
              Download only videos uploaded in this date

       --datebefore DATE
              Download only videos uploaded on or before this date (i.e.  inclusive)

       --dateafter DATE
              Download only videos uploaded on or after this date (i.e.  inclusive)

       --min-views COUNT
              Do not download any videos with less than COUNT views

       --max-views COUNT
              Do not download any videos with more than COUNT views

       --match-filter FILTER
              Generic  video  filter.   Specify  any key (see the "OUTPUT TEMPLATE" for a list of
              available keys) to match if the key is present, !key to check if  the  key  is  not
              present, key > NUMBER (like "comment_count > 12", also works with >=, <, <=, !=, =)
              to compare against a number, key = 'LITERAL' (like "uploader = 'Mike Smith'",  also
              works with !=) to match against a string literal and & to require multiple matches.
              Values which are not known are excluded unless you put a question  mark  (?)  after
              the operator.  For example, to only match videos that have been liked more than 100
              times and disliked less  than  50  times  (or  the  dislike  functionality  is  not
              available   at   the   given  service),  but  who  also  have  a  description,  use
              --match-filter "like_count > 100 & dislike_count <?  50 & description" .

       --no-playlist
              Download only the video, if the URL refers to a video and a playlist.

       --yes-playlist
              Download the playlist, if the URL refers to a video and a playlist.

       --age-limit YEARS
              Download only videos suitable for the given age

       --download-archive FILE
              Download only videos not listed in  the  archive  file.   Record  the  IDs  of  all
              downloaded videos in it.

       --include-ads
              Download advertisements as well (experimental)

   Download Options:
       -r, --limit-rate RATE
              Maximum download rate in bytes per second (e.g.  50K or 4.2M)

       -R, --retries RETRIES
              Number of retries (default is 10), or "infinite".

       --fragment-retries RETRIES
              Number  of  retries  for a fragment (default is 10), or "infinite" (DASH, hlsnative
              and ISM)

       --skip-unavailable-fragments
              Skip unavailable fragments (DASH, hlsnative and ISM)

       --abort-on-unavailable-fragment
              Abort downloading when some fragment is not available

       --keep-fragments
              Keep downloaded fragments on disk after  downloading  is  finished;  fragments  are
              erased by default

       --buffer-size SIZE
              Size of download buffer (e.g.  1024 or 16K) (default is 1024)

       --no-resize-buffer
              Do  not  automatically  adjust  the  buffer  size.   By default, the buffer size is
              automatically resized from an initial value of SIZE.

       --playlist-reverse
              Download playlist videos in reverse order

       --playlist-random
              Download playlist videos in random order

       --xattr-set-filesize
              Set file xattribute ytdl.filesize with expected file size (experimental)

       --hls-prefer-native
              Use the native HLS downloader instead of ffmpeg

       --hls-prefer-ffmpeg
              Use ffmpeg instead of the native HLS downloader

       --hls-use-mpegts
              Use the mpegts  container  for  HLS  videos,  allowing  to  play  the  video  while
              downloading (some players may not be able to play it)

       --external-downloader COMMAND
              Use      the     specified     external     downloader.      Currently     supports
              aria2c,avconv,axel,curl,ffmpeg,httpie,wget

       --external-downloader-args ARGS
              Give these arguments to the external downloader

   Filesystem Options:
       -a, --batch-file FILE
              File containing URLs to download ('-' for stdin)

       --id   Use only video ID in file name

       -o, --output TEMPLATE
              Output filename template, see the "OUTPUT TEMPLATE" for all the info

       --autonumber-start NUMBER
              Specify the start value for %(autonumber)s (default is 1)

       --restrict-filenames
              Restrict filenames to only ASCII characters, and avoid "&" and spaces in filenames

       -w, --no-overwrites
              Do not overwrite files

       -c, --continue
              Force resume of partially downloaded files.  By  default,  youtube-dl  will  resume
              downloads if possible.

       --no-continue
              Do not resume partially downloaded files (restart from beginning)

       --no-part
              Do not use .part files - write directly into output file

       --no-mtime
              Do not use the Last-modified header to set the file modification time

       --write-description
              Write video description to a .description file

       --write-info-json
              Write video metadata to a .info.json file

       --write-annotations
              Write video annotations to a .annotations.xml file

       --load-info-json FILE
              JSON  file  containing  the video information (created with the "--write-info-json"
              option)

       --cookies FILE
              File to read cookies from and dump cookie jar in

       --cache-dir DIR
              Location in the filesystem where youtube-dl can store some  downloaded  information
              permanently.   By  default  $XDG_CACHE_HOME/youtube-dl or ~/.cache/youtube-dl .  At
              the moment, only YouTube player files (for videos with obfuscated  signatures)  are
              cached, but that may change.

       --no-cache-dir
              Disable filesystem caching

       --rm-cache-dir
              Delete all filesystem cache files

   Thumbnail images:
       --write-thumbnail
              Write thumbnail image to disk

       --write-all-thumbnails
              Write all thumbnail image formats to disk

       --list-thumbnails
              Simulate and list all available thumbnail formats

   Verbosity / Simulation Options:
       -q, --quiet
              Activate quiet mode

       --no-warnings
              Ignore warnings

       -s, --simulate
              Do not download the video and do not write anything to disk

       --skip-download
              Do not download the video

       -g, --get-url
              Simulate, quiet but print URL

       -e, --get-title
              Simulate, quiet but print title

       --get-id
              Simulate, quiet but print id

       --get-thumbnail
              Simulate, quiet but print thumbnail URL

       --get-description
              Simulate, quiet but print video description

       --get-duration
              Simulate, quiet but print video length

       --get-filename
              Simulate, quiet but print output filename

       --get-format
              Simulate, quiet but print output format

       -j, --dump-json
              Simulate,  quiet  but  print  JSON  information.   See  the "OUTPUT TEMPLATE" for a
              description of available keys.

       -J, --dump-single-json
              Simulate, quiet but print JSON information for each command-line argument.  If  the
              URL refers to a playlist, dump the whole playlist information in a single line.

       --print-json
              Be quiet and print the video information as JSON (video is still being downloaded).

       --newline
              Output progress bar as new lines

       --no-progress
              Do not print progress bar

       --console-title
              Display progress in console titlebar

       -v, --verbose
              Print various debugging information

       --dump-pages
              Print downloaded pages encoded using base64 to debug problems (very verbose)

       --write-pages
              Write  downloaded  intermediary  pages  to  files in the current directory to debug
              problems

       --print-traffic
              Display sent and read HTTP traffic

       -C, --call-home
              Contact the youtube-dl server for debugging

       --no-call-home
              Do NOT contact the youtube-dl server for debugging

   Workarounds:
       --encoding ENCODING
              Force the specified encoding (experimental)

       --no-check-certificate
              Suppress HTTPS certificate validation

       --prefer-insecure
              Use an unencrypted connection to retrieve information about the video.   (Currently
              supported only for YouTube)

       --user-agent UA
              Specify a custom user agent

       --referer URL
              Specify a custom referer, use if the video access is restricted to one domain

       --add-header FIELD:VALUE
              Specify  a custom HTTP header and its value, separated by a colon ':'.  You can use
              this option multiple times

       --bidi-workaround
              Work around terminals that lack bidirectional  text  support.   Requires  bidiv  or
              fribidi executable in PATH

       --sleep-interval SECONDS
              Number of seconds to sleep before each download when used alone or a lower bound of
              a range for randomized sleep before  each  download  (minimum  possible  number  of
              seconds to sleep) when used along with --max-sleep-interval.

       --max-sleep-interval SECONDS
              Upper  bound of a range for randomized sleep before each download (maximum possible
              number of seconds to sleep).  Must only be used along with --min-sleep-interval.

   Video Format Options:
       -f, --format FORMAT
              Video format code, see the "FORMAT SELECTION" for all the info

       --all-formats
              Download all available video formats

       --prefer-free-formats
              Prefer free video formats unless a specific one is requested

       -F, --list-formats
              List all available formats of requested videos

       --youtube-skip-dash-manifest
              Do not download the DASH manifests and related data on YouTube videos

       --merge-output-format FORMAT
              If a merge is required  (e.g.   bestvideo+bestaudio),  output  to  given  container
              format.  One of mkv, mp4, ogg, webm, flv.  Ignored if no merge is required

   Subtitle Options:
       --write-sub
              Write subtitle file

       --write-auto-sub
              Write automatically generated subtitle file (YouTube only)

       --all-subs
              Download all the available subtitles of the video

       --list-subs
              List all available subtitles for the video

       --sub-format FORMAT
              Subtitle format, accepts formats preference, for example: "srt" or "ass/srt/best"

       --sub-lang LANGS
              Languages  of the subtitles to download (optional) separated by commas, use --list-
              subs for available language tags

   Authentication Options:
       -u, --username USERNAME
              Login with this account ID

       -p, --password PASSWORD
              Account password.  If this option is left out, youtube-dl will ask interactively.

       -2, --twofactor TWOFACTOR
              Two-factor authentication code

       -n, --netrc
              Use .netrc authentication data

       --video-password PASSWORD
              Video password (vimeo, smotri, youku)

   Adobe Pass Options:
       --ap-mso MSO
              Adobe Pass multiple-system operator (TV provider) identifier, use --ap-list-mso for
              a list of available MSOs

       --ap-username USERNAME
              Multiple-system operator account login

       --ap-password PASSWORD
              Multiple-system  operator account password.  If this option is left out, youtube-dl
              will ask interactively.

       --ap-list-mso
              List all supported multiple-system operators

   Post-processing Options:
       -x, --extract-audio
              Convert video files to audio-only files (requires ffmpeg or avconv and  ffprobe  or
              avprobe)

       --audio-format FORMAT
              Specify  audio  format:  "best",  "aac", "flac", "mp3", "m4a", "opus", "vorbis", or
              "wav"; "best" by default; No effect without -x

       --audio-quality QUALITY
              Specify ffmpeg/avconv audio quality, insert  a  value  between  0  (better)  and  9
              (worse) for VBR or a specific bitrate like 128K (default 5)

       --recode-video FORMAT
              Encode   the   video   to   another   format  if  necessary  (currently  supported:
              mp4|flv|ogg|webm|mkv|avi)

       --postprocessor-args ARGS
              Give these arguments to the postprocessor

       -k, --keep-video
              Keep the video file on disk after the post- processing;  the  video  is  erased  by
              default

       --no-post-overwrites
              Do  not overwrite post-processed files; the post-processed files are overwritten by
              default

       --embed-subs
              Embed subtitles in the video (only for mp4, webm and mkv videos)

       --embed-thumbnail
              Embed thumbnail in the audio as cover art

       --add-metadata
              Write metadata to the video file

       --metadata-from-title FORMAT
              Parse additional metadata like song title /  artist  from  the  video  title.   The
              format  syntax  is  the  same  as  --output.  Regular expression with named capture
              groups may also be used.  The parsed parameters replace existing values.   Example:
              --metadata-from-  title  "%(artist)s  - %(title)s" matches a title like "Coldplay -
              Paradise".  Example (regex): --metadata-from-title "(?P.+?) - (?P
              .+)"

       --xattrs
              Write metadata to the video file's xattrs (using dublin core and xdg standards)

       --fixup POLICY
              Automatically correct known faults of the file.  One of never  (do  nothing),  warn
              (only  emit  a  warning),  detect_or_warn  (the  default;  fix file if we can, warn
              otherwise)

       --prefer-avconv
              Prefer avconv over ffmpeg for running the postprocessors (default)

       --prefer-ffmpeg
              Prefer ffmpeg over avconv for running the postprocessors

       --ffmpeg-location PATH
              Location of the ffmpeg/avconv  binary;  either  the  path  to  the  binary  or  its
              containing directory.

       --exec CMD
              Execute  a  command  on the file after downloading, similar to find's -exec syntax.
              Example: --exec 'adb push {} /sdcard/Music/ && rm {}'

       --convert-subs FORMAT
              Convert the subtitles to other format (currently supported: srt|ass|vtt|lrc)

CONFIGURATION

       You  can  configure  youtube-dl  by  placing  any  supported  command  line  option  to  a
       configuration  file.   On Linux and OS X, the system wide configuration file is located at
       /etc/youtube-dl.conf and the user wide configuration file at  ~/.config/youtube-dl/config.
       On Windows, the user wide configuration file locations are %APPDATA%\youtube-dl\config.txt
       or C:\Users\<user name>\youtube-dl.conf.  Note that by default configuration file may  not
       exist so you may need to create it yourself.

       For  example,  with  the  following  configuration file youtube-dl will always extract the
       audio, not copy the mtime, use a proxy and save all videos under Movies directory in  your
       home directory:

              # Lines starting with # are comments

              # Always extract audio
              -x

              # Do not copy the mtime
              --no-mtime

              # Use this proxy
              --proxy 127.0.0.1:3128

              # Save all videos under Movies directory in your home directory
              -o ~/Movies/%(title)s.%(ext)s

       Note  that  options  in  configuration file are just the same options aka switches used in
       regular command line calls thus there must be no whitespace after - or  --,  e.g.   -o  or
       --proxy but not - o or -- proxy.

       You can use --ignore-config if you want to disable the configuration file for a particular
       youtube-dl run.

       You can also use --config-location if you want to use  custom  configuration  file  for  a
       particular youtube-dl run.

   Authentication with .netrc file
       You  may  also want to configure automatic credentials storage for extractors that support
       authentication (by providing login and password with --username and --password)  in  order
       not  to  pass  credentials  as  command  line  arguments on every youtube-dl execution and
       prevent tracking plain text passwords in the shell command history.  You can achieve  this
       using a .netrc file (https://stackoverflow.com/tags/.netrc/info) on a per extractor basis.
       For that you will need to create a .netrc file in your $HOME and restrict  permissions  to
       read/write by only you:

              touch $HOME/.netrc
              chmod a-rwx,u+rw $HOME/.netrc

       After  that  you  can  add  credentials  for  an  extractor in the following format, where
       extractor is the name of the extractor in lowercase:

              machine <extractor> login <login> password <password>

       For example:

              machine youtube login myaccount@gmail.com password my_youtube_password
              machine twitch login my_twitch_account_name password my_twitch_password

       To activate authentication with the .netrc file you should pass --netrc to  youtube-dl  or
       place it in the configuration file (#configuration).

       On  Windows  you  may  also  need  to setup the %HOME% environment variable manually.  For
       example:

              set HOME=%USERPROFILE%

OUTPUT TEMPLATE

       The -o option allows users to indicate a template for the output file names.

       tl;dr: navigate me to examples (#output-template-examples).

       The basic usage is not to set any template arguments when downloading a single file,  like
       in  youtube-dl -o funny_video.flv "https://some/video".   However,  it may contain special
       sequences that will be replaced when downloading each video.  The special sequences may be
       formatted       according       to      python      string      formatting      operations
       (https://docs.python.org/2/library/stdtypes.html#string-formatting).      For     example,
       %(NAME)s  or  %(NAME)05d.   To  clarify,  that  is  a percent symbol followed by a name in
       parentheses, followed by a formatting operations.  Allowed names along with sequence  type
       are:

       · id (string): Video identifier

       · title (string): Video title

       · url (string): Video URL

       · ext (string): Video filename extension

       · alt_title (string): A secondary title of the video

       · display_id (string): An alternative identifier for the video

       · uploader (string): Full name of the video uploader

       · license (string): License name the video is licensed under

       · creator (string): The creator of the video

       · release_date (string): The date (YYYYMMDD) when the video was released

       · timestamp (numeric): UNIX timestamp of the moment the video became available

       · upload_date (string): Video upload date (YYYYMMDD)

       · uploader_id (string): Nickname or id of the video uploader

       · location (string): Physical location where the video was filmed

       · duration (numeric): Length of the video in seconds

       · view_count (numeric): How many users have watched the video on the platform

       · like_count (numeric): Number of positive ratings of the video

       · dislike_count (numeric): Number of negative ratings of the video

       · repost_count (numeric): Number of reposts of the video

       · average_rating  (numeric):  Average  rating give by users, the scale used depends on the
         webpage

       · comment_count (numeric): Number of comments on the video

       · age_limit (numeric): Age restriction for the video (years)

       · format (string): A human-readable description of the format

       · format_id (string): Format code specified by --format

       · format_note (string): Additional info about the format

       · width (numeric): Width of the video

       · height (numeric): Height of the video

       · resolution (string): Textual description of width and height

       · tbr (numeric): Average bitrate of audio and video in KBit/s

       · abr (numeric): Average audio bitrate in KBit/s

       · acodec (string): Name of the audio codec in use

       · asr (numeric): Audio sampling rate in Hertz

       · vbr (numeric): Average video bitrate in KBit/s

       · fps (numeric): Frame rate

       · vcodec (string): Name of the video codec in use

       · container (string): Name of the container format

       · filesize (numeric): The number of bytes, if known in advance

       · filesize_approx (numeric): An estimate for the number of bytes

       · protocol (string): The protocol that will be used for the actual download

       · extractor (string): Name of the extractor

       · extractor_key (string): Key name of the extractor

       · epoch (numeric): Unix epoch when creating the file

       · autonumber (numeric): Five-digit number that  will  be  increased  with  each  download,
         starting at zero

       · playlist (string): Name or id of the playlist that contains the video

       · playlist_index  (numeric):  Index of the video in the playlist padded with leading zeros
         according to the total length of the playlist

       · playlist_id (string): Playlist identifier

       · playlist_title (string): Playlist title

       Available for the video that belongs to some logical chapter or section:

       · chapter (string): Name or title of the chapter the video belongs to

       · chapter_number (numeric): Number of the chapter the video belongs to

       · chapter_id (string): Id of the chapter the video belongs to

       Available for the video that is an episode of some series or programme:

       · series (string): Title of the series or programme the video episode belongs to

       · season (string): Title of the season the video episode belongs to

       · season_number (numeric): Number of the season the video episode belongs to

       · season_id (string): Id of the season the video episode belongs to

       · episode (string): Title of the video episode

       · episode_number (numeric): Number of the video episode within a season

       · episode_id (string): Id of the video episode

       Available for the media that is a track or a part of a music album:

       · track (string): Title of the track

       · track_number (numeric): Number of the track within an album or a disc

       · track_id (string): Id of the track

       · artist (string): Artist(s) of the track

       · genre (string): Genre(s) of the track

       · album (string): Title of the album the track belongs to

       · album_type (string): Type of the album

       · album_artist (string): List of all artists appeared on the album

       · disc_number (numeric): Number of the disc or other physical medium the track belongs to

       · release_year (numeric): Year (YYYY) when the album was released

       Each aforementioned sequence when referenced in an output template will be replaced by the
       actual  value corresponding to the sequence name.  Note that some of the sequences are not
       guaranteed to be present since they depend  on  the  metadata  obtained  by  a  particular
       extractor.  Such sequences will be replaced with NA.

       For    example   for   -o %(title)s-%(id)s.%(ext)s   and   an   mp4   video   with   title
       youtube-dl test video    and    id    BaW_jenozKcj,    this    will    result     in     a
       youtube-dl test video-BaW_jenozKcj.mp4 file created in the current directory.

       For   numeric   sequences   you   can   use   numeric  related  formatting,  for  example,
       %(view_count)05d will result in a string with  view  count  padded  with  zeros  up  to  5
       characters, like in 00042.

       Output    templates    can    also    contain    arbitrary    hierarchical    path,   e.g.
       -o '%(playlist)s/%(playlist_index)s - %(title)s.%(ext)s' which will result in  downloading
       each video in a directory corresponding to this path template.  Any missing directory will
       be automatically created for you.

       To use percent literals in an output template use %%.  To output to stdout use -o -.

       The current default template is %(title)s-%(id)s.%(ext)s.

       In some cases, you don't want special characters such as 中, spaces, or &,  such  as  when
       transferring  the  downloaded  filename  to  a  Windows  system or the filename through an
       8bit-unsafe channel.  In these cases, add the --restrict-filenames flag to get  a  shorter
       title:

   Output template and Windows batch files
       If you are using an output template inside a Windows batch file then you must escape plain
       percent characters (%) by doubling, so that  -o "%(title)s-%(id)s.%(ext)s"  should  become
       -o "%%(title)s-%%(id)s.%%(ext)s".   However  you  should  not touch %'s that are not plain
       characters,   e.g.    environment   variables   for   expansion   should   stay    intact:
       -o "C:\%HOMEPATH%\Desktop\%%(title)s.%%(ext)s".

   Output template examples
       Note that on Windows you may need to use double quotes instead of single.

              $ youtube-dl --get-filename -o '%(title)s.%(ext)s' BaW_jenozKc
              youtube-dl test video ''_ä↭𝕐.mp4    # All kinds of weird characters

              $ youtube-dl --get-filename -o '%(title)s.%(ext)s' BaW_jenozKc --restrict-filenames
              youtube-dl_test_video_.mp4          # A simple file name

              # Download YouTube playlist videos in separate directory indexed by video order in a playlist
              $ youtube-dl -o '%(playlist)s/%(playlist_index)s - %(title)s.%(ext)s' https://www.youtube.com/playlist?list=PLwiyx1dc3P2JR9N8gQaQN_BCvlSlap7re

              # Download all playlists of YouTube channel/user keeping each playlist in separate directory:
              $ youtube-dl -o '%(uploader)s/%(playlist)s/%(playlist_index)s - %(title)s.%(ext)s' https://www.youtube.com/user/TheLinuxFoundation/playlists

              # Download Udemy course keeping each chapter in separate directory under MyVideos directory in your home
              $ youtube-dl -u user -p password -o '~/MyVideos/%(playlist)s/%(chapter_number)s - %(chapter)s/%(title)s.%(ext)s' https://www.udemy.com/java-tutorial/

              # Download entire series season keeping each series and each season in separate directory under C:/MyVideos
              $ youtube-dl -o "C:/MyVideos/%(series)s/%(season_number)s - %(season)s/%(episode_number)s - %(episode)s.%(ext)s" https://videomore.ru/kino_v_detalayah/5_sezon/367617

              # Stream the video being downloaded to stdout
              $ youtube-dl -o - BaW_jenozKc

FORMAT SELECTION

       By  default youtube-dl tries to download the best available quality, i.e.  if you want the
       best quality you don't need to pass any special options, youtube-dl will guess it for  you
       by default.

       But  sometimes you may want to download in a different format, for example when you are on
       a slow or intermittent connection.  The key mechanism  for  achieving  this  is  so-called
       format  selection based on which you can explicitly specify desired format, select formats
       based on some criterion or criteria, setup precedence and much more.

       The general syntax for format selection is  --format FORMAT  or  shorter  -f FORMAT  where
       FORMAT  is a selector expression, i.e.  an expression that describes format or formats you
       would like to download.

       tl;dr: navigate me to examples (#format-selection-examples).

       The simplest case is requesting a specific format, for example with -f 22 you can download
       the  format  with format code equal to 22.  You can get the list of available format codes
       for particular video using --list-formats  or  -F.   Note  that  these  format  codes  are
       extractor specific.

       You  can also use a file extension (currently 3gp, aac, flv, m4a, mp3, mp4, ogg, wav, webm
       are supported) to download the best quality format of a particular file  extension  served
       as  a  single  file,  e.g.   -f webm  will  download the best quality format with the webm
       extension served as a single file.

       You can also use special names to select particular edge case formats: - best: Select  the
       best  quality  format  represented by a single file with video and audio.  - worst: Select
       the worst quality format represented by a single file with video and audio.  -  bestvideo:
       Select  the  best  quality video-only format (e.g.  DASH video).  May not be available.  -
       worstvideo: Select the  worst  quality  video-only  format.   May  not  be  available.   -
       bestaudio:  Select  the  best  quality  audio  only-format.   May  not  be  available.   -
       worstaudio: Select the worst quality audio only-format.  May not be available.

       For example, to download the worst quality video-only format you can use -f worstvideo.

       If you want to download multiple videos and they don't have the  same  formats  available,
       you   can   specify   the   order  of  preference  using  slashes.   Note  that  slash  is
       left-associative, i.e.   formats  on  the  left  hand  side  are  preferred,  for  example
       -f 22/17/18  will  download format 22 if it's available, otherwise it will download format
       17 if it's available, otherwise it will download format 18 if it's available, otherwise it
       will complain that no suitable formats are available for download.

       If you want to download several formats of the same video use a comma as a separator, e.g.
       -f 22,17,18 will download all these three formats, of course if they are available.  Or  a
       more     sophisticated     example     combined     with     the    precedence    feature:
       -f 136/137/mp4/bestvideo,140/m4a/bestaudio.

       You can also filter  the  video  formats  by  putting  a  condition  in  brackets,  as  in
       -f "best[height=720]" (or -f "[filesize>10M]").

       The  following  numeric meta fields can be used with comparisons <, <=, >, >=, = (equals),
       != (not equals): - filesize: The number of bytes, if known in advance -  width:  Width  of
       the  video,  if  known  -  height: Height of the video, if known - tbr: Average bitrate of
       audio and video in KBit/s - abr: Average audio bitrate in  KBit/s  -  vbr:  Average  video
       bitrate in KBit/s - asr: Audio sampling rate in Hertz - fps: Frame rate

       Also  filtering  work  for  comparisons  = (equals), != (not equals), ^= (begins with), $=
       (ends with), *= (contains) and following string meta  fields:  -  ext:  File  extension  -
       acodec:  Name  of  the  audio  codec  in  use  -  vcodec: Name of the video codec in use -
       container: Name of the container format - protocol: The protocol that will be used for the
       actual   download,   lower-case   (http,   https,   rtsp,  rtmp,  rtmpe,  mms,  f4m,  ism,
       http_dash_segments, m3u8, or m3u8_native) - format_id: A short description of the format

       Note that none of the aforementioned meta fields are guaranteed to be present  since  this
       solely  depends  on  the  metadata  obtained  by  particular extractor, i.e.  the metadata
       offered by the video hoster.

       Formats for which the value is not known are excluded unless you put a question  mark  (?)
       after  the  operator.   You  can combine format filters, so -f "[height <=? 720][tbr>500]"
       selects up to 720p videos (or videos where the height is not known) with a bitrate  of  at
       least 500 KBit/s.

       You   can   merge   the  video  and  audio  of  two  formats  into  a  single  file  using
       -f <video-format>+<audio-format>  (requires  ffmpeg  or  avconv  installed),  for  example
       -f bestvideo+bestaudio  will  download  the  best  video-only  format, the best audio-only
       format and mux them together with ffmpeg/avconv.

       Format selectors can also be grouped  using  parentheses,  for  example  if  you  want  to
       download  the  best  mp4  and  webm  formats  with  a  height  lower  than 480 you can use
       -f '(mp4,webm)[height<480]'.

       Since   the   end   of   April   2015   and   version    2015.04.26,    youtube-dl    uses
       -f bestvideo+bestaudio/best    as    the    default    format    selection    (see   #5447
       (https://github.com/rg3/youtube-dl/issues/5447),  #5456   (https://github.com/rg3/youtube-
       dl/issues/5456)).  If ffmpeg or avconv are installed this results in downloading bestvideo
       and bestaudio separately and muxing them together into  a  single  file  giving  the  best
       overall quality available.  Otherwise it falls back to best and results in downloading the
       best available quality served as a single file.  best is also needed for videos that don't
       come  from  YouTube because they don't provide the audio and video in two different files.
       If you want to only download some DASH formats (for example if you are not  interested  in
       getting    videos    with    a    resolution    higher    than   1080p),   you   can   add
       -f bestvideo[height<=?1080]+bestaudio/best to your configuration file.  Note that  if  you
       use youtube-dl to stream to stdout (and most likely to pipe it to your media player then),
       i.e.  you explicitly specify output template as -o -, youtube-dl still uses -f best format
       selection  in  order  to start content delivery immediately to your player and not to wait
       until bestvideo and bestaudio are downloaded and muxed.

       If  you  want  to  preserve  the  old  format  selection  behavior  (prior  to  youtube-dl
       2015.04.26),  i.e.   you  want  to  download  the best available quality media served as a
       single file, you should explicitly specify your choice with -f best.  You may want to  add
       it  to  the configuration file (#configuration) in order not to type it every time you run
       youtube-dl.

   Format selection examples
       Note that on Windows you may need to use double quotes instead of single.

              # Download best mp4 format available or any other best if no mp4 available
              $ youtube-dl -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best'

              # Download best format available but not better that 480p
              $ youtube-dl -f 'bestvideo[height<=480]+bestaudio/best[height<=480]'

              # Download best video only format but no bigger than 50 MB
              $ youtube-dl -f 'best[filesize<50M]'

              # Download best format available via direct link over HTTP/HTTPS protocol
              $ youtube-dl -f '(bestvideo+bestaudio/best)[protocol^=http]'

              # Download the best video format and the best audio format without merging them
              $ youtube-dl -f 'bestvideo,bestaudio' -o '%(title)s.f%(format_id)s.%(ext)s'

       Note that in the last  example,  an  output  template  is  recommended  as  bestvideo  and
       bestaudio may have the same file name.

VIDEO SELECTION

       Videos  can  be  filtered  by  their upload date using the options --date, --datebefore or
       --dateafter.  They accept dates in two formats:

       · Absolute dates: Dates in the format YYYYMMDD.

       · Relative dates: Dates in the format (now|today)[+-][0-9](day|week|month|year)(s)?

       Examples:

              # Download only the videos uploaded in the last 6 months
              $ youtube-dl --dateafter now-6months

              # Download only the videos uploaded on January 1, 1970
              $ youtube-dl --date 19700101

              $ # Download only the videos uploaded in the 200x decade
              $ youtube-dl --dateafter 20000101 --datebefore 20091231

FAQ

   How do I update youtube-dl?
       If you've followed our manual  installation  instructions  (https://rg3.github.io/youtube-
       dl/download.html), you can simply run youtube-dl -U (or, on Linux, sudo youtube-dl -U).

       If you have used pip, a simple sudo pip install -U youtube-dl is sufficient to update.

       If  you  have  installed  youtube-dl  using a package manager like apt-get or yum, use the
       standard system update mechanism to update.  Note that  distribution  packages  are  often
       outdated.  As a rule of thumb, youtube-dl releases at least once a month, and often weekly
       or even  daily.   Simply  go  to  https://yt-dl.org  to  find  out  the  current  version.
       Unfortunately,  there  is  nothing  we  youtube-dl  developers can do if your distribution
       serves a really outdated version.  You can (and should) complain to your  distribution  in
       their bugtracker or support forum.

       As a last resort, you can also uninstall the version installed by your package manager and
       follow our manual installation instructions.  For that, remove the distribution's package,
       with a line like

              sudo apt-get remove -y youtube-dl

       Afterwards,      simply      follow      our      manual     installation     instructions
       (https://rg3.github.io/youtube-dl/download.html):

              sudo wget https://yt-dl.org/latest/youtube-dl -O /usr/local/bin/youtube-dl
              sudo chmod a+x /usr/local/bin/youtube-dl
              hash -r

       Again, from then on you'll be able to update with sudo youtube-dl -U.

   youtube-dl is extremely slow to start on Windows
       Add a file exclusion for youtube-dl.exe in Windows Defender settings.

   I'm getting an error
       Unable to extract OpenGraph title on YouTube playlists

       YouTube changed their playlist format in March 2014 and later on, so you'll need at  least
       youtube-dl 2014.07.25 to download all YouTube videos.

       If  you  have  installed  youtube-dl  with  a package manager, pip, setup.py or a tarball,
       please use that to update.  Note that Ubuntu packages do not seem to get updated  anymore.
       Since  we  are not affiliated with Ubuntu, there is little we can do.  Feel free to report
       bugs   (https://bugs.launchpad.net/ubuntu/+source/youtube-dl/+filebug)   to   the   Ubuntu
       packaging                              people                              (mailto:ubuntu-
       motu@lists.ubuntu.com?subject=outdated%20version%20of%20youtube-dl) - all they have to  do
       is update the package to a somewhat recent version.  See above for a way to update.

   I'm getting an error when trying to use output template:
       error: using output template conflicts with using title, video ID or auto number

       Make  sure  you  are  not  using  -o  with  any  of these options -t, --title, --id, -A or
       --auto-number set in command line or in a configuration file.  Remove the latter if any.

   Do I always have to pass -citw?
       By default, youtube-dl intends to have the best  options  (incidentally,  if  you  have  a
       convincing  case  that  these  should be different, please file an issue where you explain
       that (https://yt-dl.org/bug)).  Therefore, it is unnecessary and sometimes harmful to copy
       long  option  strings  from webpages.  In particular, the only option out of -citw that is
       regularly useful is -i.

   Can you please put the -b option back?
       Most people asking this question are not aware that youtube-dl now defaults to downloading
       the  highest available quality as reported by YouTube, which will be 1080p or 720p in some
       cases, so you no longer need the -b option.  For some specific videos, maybe YouTube  does
       not  report  them  to be available in a specific high quality format you're interested in.
       In that case, simply request it with the -f option and youtube-dl will try to download it.

   I get HTTP error 402 when trying to download a video. What's
       this?

       Apparently YouTube requires you to pass a CAPTCHA test if you download  too  much.   We're
       considering to provide a way to let you solve the CAPTCHA (https://github.com/rg3/youtube-
       dl/issues/154), but at the moment, your best course of action is pointing a web browser to
       the youtube URL, solving the CAPTCHA, and restart youtube-dl.

   Do I need any other programs?
       youtube-dl  works  fine  on  its  own  on  most  sites.   However,  if you want to convert
       video/audio, you'll need avconv (https://libav.org/) or ffmpeg  (https://www.ffmpeg.org/).
       On  some sites - most notably YouTube - videos can be retrieved in a higher quality format
       without sound.  youtube-dl will detect whether avconv/ffmpeg is present and  automatically
       pick the best option.

       Videos  or  video  formats streamed via RTMP protocol can only be downloaded when rtmpdump
       (https://rtmpdump.mplayerhq.hu/) is installed.  Downloading MMS and RTSP  videos  requires
       either mplayer (https://mplayerhq.hu/) or mpv (https://mpv.io/) to be installed.

   I have downloaded a video but how can I play it?
       Once  the  video is fully downloaded, use any video player, such as mpv (https://mpv.io/),
       vlc (https://www.videolan.org/) or mplayer (https://www.mplayerhq.hu/).

   I extracted a video URL with -g, but it does not play on
       another machine / in my web browser.

       It depends a lot on the service.  In many cases, requests for the video (to  download/play
       it) must come from the same IP address and with the same cookies and/or HTTP headers.  Use
       the --cookies option to write the required cookies into a file, and advise your downloader
       to  read  cookies from that file.  Some sites also require a common user agent to be used,
       use --dump-user-agent to see the one in use by youtube-dl.  You  can  also  get  necessary
       cookies and HTTP headers from JSON output obtained with --dump-json.

       It  may  be  beneficial  to  use IPv6; in some cases, the restrictions are only applied to
       IPv4.  Some services (sometimes only for a subset of videos) do not restrict the video URL
       by IP address, cookie, or user-agent, but these are the exception rather than the rule.

       Please  bear in mind that some URL protocols are not supported by browsers out of the box,
       including RTMP.  If you are using -g, your own downloader must support these as well.

       If you want to play the video on a machine that is not running youtube-dl, you  can  relay
       the  video  content  from  the  machine  that  runs  youtube-dl.   You can use -o - to let
       youtube-dl stream a video to stdout, or simply allow the  player  to  download  the  files
       written by youtube-dl in turn.

   ERROR: no fmt_url_map or conn information found in video info
       YouTube has switched to a new video info format in July 2011 which is not supported by old
       versions of  youtube-dl.   See  above  (#how-do-i-update-youtube-dl)  for  how  to  update
       youtube-dl.

   ERROR: unable to download video
       YouTube  requires  an  additional signature since September 2012 which is not supported by
       old versions of youtube-dl.  See above (#how-do-i-update-youtube-dl)  for  how  to  update
       youtube-dl.

   Video URL contains an ampersand and I'm getting some strange
       output [1] 2839 or 'v' is not recognized as an internal or external command

       That's  actually  the output from your shell.  Since ampersand is one of the special shell
       characters it's interpreted by the shell preventing you from  passing  the  whole  URL  to
       youtube-dl.   To disable your shell from interpreting the ampersands (or any other special
       characters) you have to either put the whole URL in quotes or escape them with a backslash
       (which approach will work depends on your shell).

       For  example if your URL is https://www.youtube.com/watch?t=4&v=BaW_jenozKc you should end
       up with following command:

       youtube-dl 'https://www.youtube.com/watch?t=4&v=BaW_jenozKc'

       or

       youtube-dl https://www.youtube.com/watch?t=4\&v=BaW_jenozKc

       For Windows you have to use the double quotes:

       youtube-dl "https://www.youtube.com/watch?t=4&v=BaW_jenozKc"

   ExtractorError: Could not find JS function u'OF'
       In February 2015, the new YouTube player contained a character sequence in a  string  that
       was misinterpreted by old versions of youtube-dl.  See above (#how-do-i-update-youtube-dl)
       for how to update youtube-dl.

   HTTP Error 429: Too Many Requests or 402: Payment Required
       These two error codes indicate that the service is blocking your  IP  address  because  of
       overuse.   Contact  the  service and ask them to unblock your IP address, or - if you have
       acquired a whitelisted IP address already - use the --proxy  or  --source-address  options
       (#network-options) to select another IP address.

   SyntaxError: Non-ASCII character
       The error

              File "youtube-dl", line 2
              SyntaxError: Non-ASCII character '\x93' ...

       means you're using an outdated version of Python.  Please update to Python 2.6 or 2.7.

   What is this binary file? Where has the code gone?
       Since June 2012 (#342 (https://github.com/rg3/youtube-dl/issues/342)) youtube-dl is packed
       as an executable zipfile, simply unzip it (might need renaming to youtube-dl.zip first  on
       some systems) or clone the git repository, as laid out above.  If you modify the code, you
       can run  it  by  executing  the  __main__.py  file.   To  recompile  the  executable,  run
       make youtube-dl.

   The exe throws an error due to missing MSVCR100.dll
       To  run  the  exe  you need to install first the Microsoft Visual C++ 2010 Redistributable
       Package (x86) (https://www.microsoft.com/en-US/download/details.aspx?id=5555).

   On Windows, how should I set up ffmpeg and youtube-dl? Where should
       I put the exe files?

       If you put youtube-dl and ffmpeg in the same directory that  you're  running  the  command
       from, it will work, but that's rather cumbersome.

       To  make  a different directory work - either for ffmpeg, or for youtube-dl, or for both -
       simply create the directory  (say,  C:\bin,  or  C:\Users\<User name>\bin),  put  all  the
       executables   directly   in   there,   and   then   set  your  PATH  environment  variable
       (https://www.java.com/en/download/help/path.xml) to include that directory.

       From then on, after restarting your shell, you will be able to access both youtube-dl  and
       ffmpeg (and youtube-dl will be able to find ffmpeg) by simply typing youtube-dl or ffmpeg,
       no matter what directory you're in.

   How do I put downloads into a specific folder?
       Use  the  -o   to   specify   an   output   template   (#output-template),   for   example
       -o "/home/user/videos/%(title)s-%(id)s.%(ext)s".   If  you  want  this  for  all  of  your
       downloads, put the option into your configuration file (#configuration).

   How do I download a video starting with a -?
       Either prepend https://www.youtube.com/watch?v= or separate the ID from the  options  with
       --:

              youtube-dl -- -wNyEUrxzFU
              youtube-dl "https://www.youtube.com/watch?v=-wNyEUrxzFU"

   How do I pass cookies to youtube-dl?
       Use the --cookies option, for example --cookies /path/to/cookies/file.txt.

       In  order  to  extract  cookies  from  browser  use  any  conforming browser extension for
       exporting            cookies.             For             example,             cookies.txt
       (https://chrome.google.com/webstore/detail/cookiestxt/njabckikapfpffapmjgojcnbfjonfjfg)
       (for Chrome)  or  Export  Cookies  (https://addons.mozilla.org/en-US/firefox/addon/export-
       cookies/) (for Firefox).

       Note  that  the  cookies file must be in Mozilla/Netscape format and the first line of the
       cookies file must be either # HTTP Cookie File or # Netscape HTTP Cookie File.  Make  sure
       you  have  correct  newline  format (https://en.wikipedia.org/wiki/Newline) in the cookies
       file and convert newlines if necessary to correspond with your OS, namely CRLF (\r\n)  for
       Windows   and   LF   (\n)   for   Unix  and  Unix-like  systems  (Linux,  Mac  OS,  etc.).
       HTTP Error 400: Bad Request when using --cookies is a good sign of invalid newline format.

       Passing cookies to youtube-dl is  a  good  way  to  workaround  login  when  a  particular
       extractor  does  not  implement it explicitly.  Another use case is working around CAPTCHA
       (https://en.wikipedia.org/wiki/CAPTCHA) some websites require you to solve  in  particular
       cases in order to get access (e.g.  YouTube, CloudFlare).

   How do I stream directly to media player?
       You  will first need to tell youtube-dl to stream media to stdout with -o -, and also tell
       your media player to read from stdin (it must be capable of this for streaming)  and  then
       pipe  former  to latter.  For example, streaming to vlc (https://www.videolan.org/) can be
       achieved with:

              youtube-dl -o - "https://www.youtube.com/watch?v=BaW_jenozKcj" | vlc -

   How do I download only new videos from a playlist?
       Use download-archive feature.   With  this  feature  you  should  initially  download  the
       complete  playlist  with  --download-archive /path/to/download/archive/file.txt  that will
       record identifiers of all the videos in a special file.  Each subsequent run with the same
       --download-archive  will  download  only  new  videos  and  skip all videos that have been
       downloaded before.  Note that only successful downloads are recorded in the file.

       For example, at first,

              youtube-dl --download-archive archive.txt "https://www.youtube.com/playlist?list=PLwiyx1dc3P2JR9N8gQaQN_BCvlSlap7re"

       will download the complete PLwiyx1dc3P2JR9N8gQaQN_BCvlSlap7re playlist and create  a  file
       archive.txt.  Each subsequent run will only download new videos if any:

              youtube-dl --download-archive archive.txt "https://www.youtube.com/playlist?list=PLwiyx1dc3P2JR9N8gQaQN_BCvlSlap7re"

   Should I add --hls-prefer-native into my config?
       When  youtube-dl  detects  an  HLS  video,  it  can  download  it either with the built-in
       downloader or ffmpeg.  Since many HLS streams are slightly invalid  and  ffmpeg/youtube-dl
       each  handle  some  invalid  cases better than the other, there is an option to switch the
       downloader if needed.

       When youtube-dl knows that one particular downloader works better  for  a  given  website,
       that  downloader  will be picked.  Otherwise, youtube-dl will pick the best downloader for
       general compatibility, which at the moment happens to be ffmpeg.  This choice  may  change
       in  future  versions  of  youtube-dl,  with improvements of the built-in downloader and/or
       ffmpeg.

       In particular, the generic extractor (used when  your  website  is  not  in  the  list  of
       supported   sites   by  youtube-dl  (https://rg3.github.io/youtube-dl/supportedsites.html)
       cannot mandate one specific downloader.

       If you put either --hls-prefer-native or --hls-prefer-ffmpeg into  your  configuration,  a
       different subset of videos will fail to download correctly.  Instead, it is much better to
       file an issue (https://yt-dl.org/bug) or a pull request which details why  the  native  or
       the ffmpeg HLS downloader is a better choice for your use case.

   Can you add support for this anime video site, or site which shows
       current movies for free?

       As  a  matter  of  policy  (as  well as legality), youtube-dl does not include support for
       services that specialize in infringing copyright.  As a  rule  of  thumb,  if  you  cannot
       easily  find a video that the service is quite obviously allowed to distribute (i.e.  that
       has been uploaded by the creator, the creator's distributor, or is published under a  free
       license), the service is probably unfit for inclusion to youtube-dl.

       A  note on the service that they don't host the infringing content, but just link to those
       who do, is evidence that the service should not be included  into  youtube-dl.   The  same
       goes for any DMCA note when the whole front page of the service is filled with videos they
       are not allowed to distribute.  A "fair use" note is equally unconvincing if  the  service
       shows copyright-protected videos in full without authorization.

       Support  requests for services that do purchase the rights to distribute their content are
       perfectly fine though.  If in doubt, you can simply include a  source  that  mentions  the
       legitimate purchase of content.

   How can I speed up work on my issue?
       (Also  known as: Help, my important issue not being solved!) The youtube-dl core developer
       team is quite small.  While we do our best to solve as many issues as possible,  sometimes
       that can take quite a while.  To speed up your issue, here's what you can do:

       First  of  all,  please do report the issue at our issue tracker (https://yt-dl.org/bugs).
       That allows us to coordinate all efforts by users and developers, and serves as a  unified
       point.  Unfortunately, the youtube-dl project has grown too large to use personal email as
       an effective communication channel.

       Please read the bug reporting instructions (#bugs) below.  A lot  of  bugs  lack  all  the
       necessary  information.   If  you can, offer proxy, VPN, or shell access to the youtube-dl
       developers.  If you are able to, test  the  issue  from  multiple  computers  in  multiple
       countries to exclude local censorship or misconfiguration issues.

       If  nobody  is interested in solving your issue, you are welcome to take matters into your
       own hands and submit a pull request (or coerce/pay somebody else to do so).

       Feel free to bump the issue from time to time by writing a small comment ("Issue is  still
       present  in  youtube-dl  version  ...from France, but fixed from Belgium"), but please not
       more than once a month.  Please do not declare your issue as important or urgent.

   How can I detect whether a given URL is supported by youtube-dl?
       For one, have a look at the list of supported sites (docs/supportedsites.md).   Note  that
       it   can   sometimes   happen   that   the   site   changes  its  URL  scheme  (say,  from
       https://example.com/video/1234567  to  https://example.com/v/1234567  )   and   youtube-dl
       reports  an  URL  of a service in that list as unsupported.  In that case, simply report a
       bug.

       It is not possible to detect whether a URL is supported or not.  That's because youtube-dl
       contains  a  generic  extractor  which  matches  all URLs.  You may be tempted to disable,
       exclude, or remove the generic extractor, but the generic extractor not only allows  users
       to  extract  videos from lots of websites that embed a video from another service, but may
       also be used to extract video from a service that  it's  hosting  itself.   Therefore,  we
       neither recommend nor support disabling, excluding, or removing the generic extractor.

       If  you want to find out whether a given URL is supported, simply call youtube-dl with it.
       If you get no videos back, chances are the URL is either  not  referring  to  a  video  or
       unsupported.  You can find out which by examining the output (if you run youtube-dl on the
       console) or catching an UnsupportedError exception if you run it from a Python program.

Why do I need to go through that much red tape when filing bugs?

       Before we had the  issue  template,  despite  our  extensive  bug  reporting  instructions
       (#bugs),  about  80% of the issue reports we got were useless, for instance because people
       used ancient versions hundreds of releases old, because of simple syntactic errors (not in
       youtube-dl  but in general shell usage), because the problem was already reported multiple
       times before, because people did not actually read an  error  message,  even  if  it  said
       "please  install  ffmpeg",  because  people  did  not  mention the URL they were trying to
       download and many more simple, easy-to-avoid problems, many of whom were totally unrelated
       to youtube-dl.

       youtube-dl  is  an  open-source project manned by too few volunteers, so we'd rather spend
       time fixing bugs where we are certain none of those simple problems apply,  and  where  we
       can  be reasonably confident to be able to reproduce the issue without asking the reporter
       repeatedly.  As such, the output  of  youtube-dl -v YOUR_URL_HERE  is  really  all  that's
       required  to  file  an issue.  The issue template also guides you through some basic steps
       you can do, such as checking that your version of youtube-dl is current.

DEVELOPER INSTRUCTIONS

       Most  users  do  not  need   to   build   youtube-dl   and   can   download   the   builds
       (https://rg3.github.io/youtube-dl/download.html) or get them from their distribution.

       To run youtube-dl as a developer, you don't need to build anything either.  Simply execute

              python -m youtube_dl

       To run the test, simply invoke your favorite test runner, or execute a test file directly;
       any of the following work:

              python -m unittest discover
              python test/test_download.py
              nosetests

       See item 6 of new extractor  tutorial  (#adding-support-for-a-new-site)  for  how  to  run
       extractor specific test cases.

       If you want to create a build of youtube-dl yourself, you'll need

       · python

       · make (only GNU make is supported)

       · pandoc

       · zip

       · nosetests

   Adding support for a new site
       If  you  want  to  add  support  for  a  new site, first of all make sure this site is not
       dedicated to copyright  infringement  (README.md#can-you-add-support-for-this-anime-video-
       site-or-site-which-shows-current-movies-for-free).  youtube-dl does not support such sites
       thus pull requests adding support for them will be rejected.

       After you have ensured this site is distributing its content legally, you can follow  this
       quick list (assuming your service is called yourextractor):

        1. Fork this repository (https://github.com/rg3/youtube-dl/fork)

        2. Check out the source code with:

                  git clone git@github.com:YOUR_GITHUB_USERNAME/youtube-dl.git

        3. Start a new git branch with

                  cd youtube-dl
                  git checkout -b yourextractor

        4. Start with this simple template and save it to youtube_dl/extractor/yourextractor.py:

                  # coding: utf-8
                  from __future__ import unicode_literals

                  from .common import InfoExtractor

                  class YourExtractorIE(InfoExtractor):
                      _VALID_URL = r'https?://(?:www\.)?yourextractor\.com/watch/(?P<id>[0-9]+)'
                      _TEST = {
                          'url': 'https://yourextractor.com/watch/42',
                          'md5': 'TODO: md5 sum of the first 10241 bytes of the video file (use --test)',
                          'info_dict': {
                              'id': '42',
                              'ext': 'mp4',
                              'title': 'Video title goes here',
                              'thumbnail': r're:^https?://.*\.jpg$',
                              # TODO more properties, either as:
                              # * A value
                              # * MD5 checksum; start the string with md5:
                              # * A regular expression; start the string with re:
                              # * Any Python type (for example int or float)
                          }
                      }

                      def _real_extract(self, url):
                          video_id = self._match_id(url)
                          webpage = self._download_webpage(url, video_id)

                          # TODO more code goes here, for example ...
                          title = self._html_search_regex(r'<h1>(.+?)</h1>', webpage, 'title')

                          return {
                              'id': video_id,
                              'title': title,
                              'description': self._og_search_description(webpage),
                              'uploader': self._search_regex(r'<div[^>]+id="uploader"[^>]*>([^<]+)<', webpage, 'uploader', fatal=False),
                              # TODO more properties (see youtube_dl/extractor/common.py)
                          }

        5. Add  an  import in youtube_dl/extractor/extractors.py (https://github.com/rg3/youtube-
           dl/blob/master/youtube_dl/extractor/extractors.py).

        6. Run python test/test_download.py TestDownload.test_YourExtractor.  This should fail at
           first, but you can continually re-run it until you're done.  If you decide to add more
           than one test, then rename _TEST to _TESTS and make it into a  list  of  dictionaries.
           The      tests     will     then     be     named     TestDownload.test_YourExtractor,
           TestDownload.test_YourExtractor_1, TestDownload.test_YourExtractor_2, etc.  Note  that
           tests with only_matching key in test's dict are not counted in.

        7. Have   a   look   at  youtube_dl/extractor/common.py  (https://github.com/rg3/youtube-
           dl/blob/master/youtube_dl/extractor/common.py)  for  possible  helper  methods  and  a
           detailed    description    of    what   your   extractor   should   and   may   return
           (https://github.com/rg3/youtube-
           dl/blob/master/youtube_dl/extractor/common.py#L74-L252).   Add  tests  and code for as
           many as you want.

        8. Make  sure  your  code  follows  youtube-dl  coding  conventions  (#youtube-dl-coding-
           conventions)  and  check  the  code with flake8 (https://pypi.python.org/pypi/flake8).
           Also make sure your code works under  all  Python  (https://www.python.org/)  versions
           claimed supported by youtube-dl, namely 2.6, 2.7, and 3.2+.

        9. When  the  tests pass, add (https://git-scm.com/docs/git-add) the new files and commit
           (https://git-scm.com/docs/git-commit)  them  and  push  (https://git-scm.com/docs/git-
           push) the result, like this:

                  $ git add youtube_dl/extractor/extractors.py
                  $ git add youtube_dl/extractor/yourextractor.py
                  $ git commit -m '[yourextractor] Add new extractor'
                  $ git push origin yourextractor

       10. Finally,  create  a  pull  request  (https://help.github.com/articles/creating-a-pull-
           request).  We'll then review and merge it.

       In any case, thank you very much for your contributions!

   youtube-dl coding conventions
       This section introduces a guide lines  for  writing  idiomatic,  robust  and  future-proof
       extractor code.

       Extractors  are  very fragile by nature since they depend on the layout of the source data
       provided by 3rd party media hosters out of your control and this layout tends  to  change.
       As  an  extractor  implementer your task is not only to write code that will extract media
       links and metadata correctly but also to minimize dependency on the  source's  layout  and
       even  to  make  the  code foresee potential future changes and be ready for that.  This is
       important because it will allow the extractor not to break on minor  layout  changes  thus
       keeping  old youtube-dl versions working.  Even though this breakage issue is easily fixed
       by emitting a new version of youtube-dl with a fix incorporated, all the previous versions
       become  broken  in  all  repositories  and  distros' packages that may not be so prompt in
       fetching the update from us.  Needless to say, some non rolling release distros may  never
       receive an update at all.

   Mandatory and optional metafields
       For  extraction to work youtube-dl relies on metadata your extractor extracts and provides
       to youtube-dl expressed  by  an  information  dictionary  (https://github.com/rg3/youtube-
       dl/blob/master/youtube_dl/extractor/common.py#L75-L257)  or  simply  info  dict.  Only the
       following meta fields  in  the  info  dict  are  considered  mandatory  for  a  successful
       extraction process by youtube-dl:

       · id (media identifier)

       · title (media title)

       · url (media download URL) or formats

       In  fact  only the last option is technically mandatory (i.e.  if you can't figure out the
       download location of the media the extraction does not make any sense).  But by convention
       youtube-dl  also treats id and title as mandatory.  Thus the aforementioned metafields are
       the critical data that the extraction does not make any sense without and if any  of  them
       fail to be extracted then the extractor is considered completely broken.

       Any                         field                         (https://github.com/rg3/youtube-
       dl/blob/master/youtube_dl/extractor/common.py#L149-L257)  apart  from  the  aforementioned
       ones are considered optional.  That means that extraction should be tolerant to situations
       when sources for these fields can potentially be unavailable  (even  if  they  are  always
       available  at the moment) and future-proof in order not to break the extraction of general
       purpose mandatory fields.

   Example
       Say you have some source dictionary meta that you've fetched as JSON with HTTP request and
       it has a key summary:

              meta = self._download_json(url, video_id)

       Assume at this point meta's layout is:

              {
                  ...
                  "summary": "some fancy summary text",
                  ...
              }

       Assume you want to extract summary and put it into the resulting info dict as description.
       Since description is an optional meta field you should be  ready  that  this  key  may  be
       missing from the meta dict, so that you should extract it like:

              description = meta.get('summary')  # correct

       and not like:

              description = meta['summary']  # incorrect

       The  latter will break extraction process with KeyError if summary disappears from meta at
       some later time  but  with  the  former  approach  extraction  will  just  go  ahead  with
       description  set  to  None  which  is  perfectly  fine (remember None is equivalent to the
       absence of data).

       Similarly, you should pass fatal=False when extracting optional data from a  webpage  with
       _search_regex, _html_search_regex or similar methods, for instance:

              description = self._search_regex(
                  r'<span[^>]+id="title"[^>]*>([^<]+)<',
                  webpage, 'description', fatal=False)

       With  fatal  set  to  False  if  _search_regex fails to extract description it will emit a
       warning and continue extraction.

       You can also pass default=<some fallback value>, for example:

              description = self._search_regex(
                  r'<span[^>]+id="title"[^>]*>([^<]+)<',
                  webpage, 'description', default=None)

       On failure this code will silently continue the extraction with description set  to  None.
       That is useful for metafields that may or may not be present.

   Provide fallbacks
       When  extracting  metadata  try  to  do so from multiple sources.  For example if title is
       present in several places, try extracting from at least some of them.  This makes it  more
       future-proof in case some of the sources become unavailable.

   Example
       Say  meta  from  the  previous example has a title and you are about to extract it.  Since
       title is a mandatory meta field you should end up with something like:

              title = meta['title']

       If title disappears from meta in future due to some  changes  on  the  hoster's  side  the
       extraction would fail since title is mandatory.  That's expected.

       Assume  that you have some another source you can extract title from, for example og:title
       HTML meta of a webpage.  In this case you can provide a fallback scenario:

              title = meta.get('title') or self._og_search_title(webpage)

       This code will try to extract from meta first and if  it  fails  it  will  try  extracting
       og:title from a webpage.

   Make regular expressions flexible
       When using regular expressions try to write them fuzzy and flexible.

   Example
       Say you need to extract title from the following HTML code:

              <span style="position: absolute; left: 910px; width: 90px; float: right; z-index: 9999;" class="title">some fancy title</span>

       The code for that task should look similar to:

              title = self._search_regex(
                  r'<span[^>]+class="title"[^>]*>([^<]+)', webpage, 'title')

       Or even better:

              title = self._search_regex(
                  r'<span[^>]+class=(["\'])title\1[^>]*>(?P<title>[^<]+)',
                  webpage, 'title', group='title')

       Note  how  you  tolerate  potential  changes in the style attribute's value or switch from
       using double quotes to single for class attribute:

       The code definitely should not look like:

              title = self._search_regex(
                  r'<span style="position: absolute; left: 910px; width: 90px; float: right; z-index: 9999;" class="title">(.*?)</span>',
                  webpage, 'title', group='title')

   Use safe conversion functions
       Wrap  all  extracted  numeric  data  into  safe   functions   from   utils:   int_or_none,
       float_or_none.  Use them for string to number conversions as well.

EMBEDDING YOUTUBE-DL

       youtube-dl  makes  the  best  effort to be a good command-line program, and thus should be
       callable from any programming language.  If you encounter any problems parsing its output,
       feel free to create a report (https://github.com/rg3/youtube-dl/issues/new).

       From a Python program, you can embed youtube-dl in a more powerful fashion, like this:

              from __future__ import unicode_literals
              import youtube_dl

              ydl_opts = {}
              with youtube_dl.YoutubeDL(ydl_opts) as ydl:
                  ydl.download(['https://www.youtube.com/watch?v=BaW_jenozKc'])

       Most  likely, you'll want to use various options.  For a list of options available, have a
       look         at          youtube_dl/YoutubeDL.py          (https://github.com/rg3/youtube-
       dl/blob/master/youtube_dl/YoutubeDL.py#L129-L279).   For a start, if you want to intercept
       youtube-dl's output, set a logger object.

       Here's a more complete example of a program that outputs only errors (and a short  message
       after the download is finished), and downloads/converts the video to an mp3 file:

              from __future__ import unicode_literals
              import youtube_dl

              class MyLogger(object):
                  def debug(self, msg):
                      pass

                  def warning(self, msg):
                      pass

                  def error(self, msg):
                      print(msg)

              def my_hook(d):
                  if d['status'] == 'finished':
                      print('Done downloading, now converting ...')

              ydl_opts = {
                  'format': 'bestaudio/best',
                  'postprocessors': [{
                      'key': 'FFmpegExtractAudio',
                      'preferredcodec': 'mp3',
                      'preferredquality': '192',
                  }],
                  'logger': MyLogger(),
                  'progress_hooks': [my_hook],
              }
              with youtube_dl.YoutubeDL(ydl_opts) as ydl:
                  ydl.download(['https://www.youtube.com/watch?v=BaW_jenozKc'])

BUGS

       Bugs  and  suggestions  should be reported at: <https://github.com/rg3/youtube-dl/issues>.
       Unless you were prompted to or there is another pertinent reason (e.g.   GitHub  fails  to
       accept  the  bug  report),  please  do  not  send  bug  reports  via  personal email.  For
       discussions, join us in the IRC channel #youtube-dl  (irc://chat.freenode.net/#youtube-dl)
       on freenode (webchat (https://webchat.freenode.net/?randomnick=1&channels=youtube-dl)).

       Please  include  the full output of youtube-dl when run with -v, i.e.  add -v flag to your
       command line, copy the whole output and post it in the  issue  body  wrapped  in  ```  for
       better formatting.  It should look similar to this:

              $ youtube-dl -v <your command line>
              [debug] System config: []
              [debug] User config: []
              [debug] Command-line args: [u'-v', u'https://www.youtube.com/watch?v=BaW_jenozKcj']
              [debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
              [debug] youtube-dl version 2015.12.06
              [debug] Git HEAD: 135392e
              [debug] Python version 2.6.6 - Windows-2003Server-5.2.3790-SP2
              [debug] exe versions: ffmpeg N-75573-g1d0487f, ffprobe N-75573-g1d0487f, rtmpdump 2.4
              [debug] Proxy map: {}
              ...

       Do not post screenshots of verbose logs; only plain text is acceptable.

       The  output  (including the first lines) contains important debugging information.  Issues
       without the full output are often not reproducible and therefore  do  not  get  solved  in
       short order, if ever.

       Please  re-read  your  issue  once again to avoid a couple of common mistakes (you can and
       should use this as a checklist):

   Is the description of the issue itself sufficient?
       We often get issue reports that we  cannot  really  decipher.   While  in  most  cases  we
       eventually  get  the  required information after asking back multiple times, this poses an
       unnecessary drain on our resources.  Many contributors, including  myself,  are  also  not
       native speakers, so we may misread some parts.

       So  please elaborate on what feature you are requesting, or what bug you want to be fixed.
       Make sure that it's obvious

       · What the problem is

       · How it could be fixed

       · How your proposed solution would look like

       If your report is shorter than two lines, it is almost certainly missing  some  of  these,
       which  makes  it  hard for us to respond to it.  We're often too polite to close the issue
       outright, but the missing info makes misinterpretation likely.  As a committer  myself,  I
       often  get  frustrated by these issues, since the only possible way for me to move forward
       on them is to ask for clarification over and over.

       For bug reports, this means that  your  report  should  contain  the  complete  output  of
       youtube-dl  when  called with the -v flag.  The error message you get for (most) bugs even
       says so, but you would not believe how many  of  our  bug  reports  do  not  contain  this
       information.

       If  your  server  has  multiple IPs or you suspect censorship, adding --call-home may be a
       good idea to get more diagnostics.  If the error is ERROR: Unable to extract ...  and  you
       cannot  reproduce it from multiple countries, add --dump-pages (warning: this will yield a
       rather large output, redirect it to the file  log.txt  by  adding  >log.txt 2>&1  to  your
       command-line)  or  upload  the  .dump  files  you get when you add --write-pages somewhere
       (https://gist.github.com/).

       Site support requests must contain an example URL.  An example URL is a URL you might want
       to download, like https://www.youtube.com/watch?v=BaW_jenozKc.  There should be an obvious
       video present.  Except under very special circumstances, the main page of a video  service
       (e.g.  https://www.youtube.com/) is not an example URL.

   Are you using the latest version?
       Before   reporting  any  issue,  type  youtube-dl -U.   This  should  report  that  you're
       up-to-date.  About 20% of the reports we receive are already fixed, but people  are  using
       outdated versions.  This goes for feature requests as well.

   Is the issue already documented?
       Make  sure that someone has not already opened the issue you're trying to open.  Search at
       the top of  the  window  or  browse  the  GitHub  Issues  (https://github.com/rg3/youtube-
       dl/search?type=Issues)  of  this  repository.   If  there  is an issue, feel free to write
       something along the lines of "This affects me as well, with version 2015.01.01.   Here  is
       some  more  information on the issue: ...".  While some issues may be old, a new post into
       them often spurs rapid activity.

   Why are existing options not enough?
       Before requesting a new feature, please have a quick peek at the list of supported options
       (https://github.com/rg3/youtube-dl/blob/master/README.md#options).   Many feature requests
       are for features that actually exist already!  Please, absolutely do show off your work in
       the issue report and detail how the existing similar options do not solve your problem.

   Is there enough context in your bug report?
       People  want  to solve problems, and often think they do us a favor by breaking down their
       larger problems (e.g.  wanting to skip already downloaded files)  to  a  specific  request
       (e.g.   requesting  us  to look whether the file exists before downloading the info page).
       However, what often happens is that they break  down  the  problem  into  two  steps:  One
       simple, and one impossible (or extremely complicated one).

       We  are  then presented with a very complicated request when the original problem could be
       solved far easier, e.g.  by recording the downloaded video IDs in  a  separate  file.   To
       avoid  this, you must include the greater context where it is non-obvious.  In particular,
       every feature request that does not consist of  adding  support  for  a  new  site  should
       contain  a  use case scenario that explains in what situation the missing feature would be
       useful.

   Does the issue involve one problem, and one problem only?
       Some of our users seem to think there is a limit of issues they can or should open.  There
       is  no limit of issues they can or should open.  While it may seem appealing to be able to
       dump all your issues into one ticket, that means that  someone  who  solves  one  of  your
       issues  cannot  mark the issue as closed.  Typically, reporting a bunch of issues leads to
       the ticket lingering since nobody wants to attack that behemoth, until someone  mercifully
       splits the issue into multiple ones.

       In  particular,  every  site  support request issue should only pertain to services at one
       site (generally under a common domain, but always using the same backend technology).   Do
       not  request support for vimeo user videos, White house podcasts, and Google Plus pages in
       the same issue.  Also, make sure  that  you  don't  post  bug  reports  alongside  feature
       requests.   As  a  rule of thumb, a feature request does not include outputs of youtube-dl
       that are not immediately related to the feature at hand.  Do not post reports of a network
       error alongside the request for a new video service.

   Is anyone going to need the feature?
       Only  post  features  that  you  (or  an  incapacitated friend you can personally talk to)
       require.  Do not post features because they seem like a good idea.   If  they  are  really
       useful, they will be requested by someone who requires them.

   Is your question about youtube-dl?
       It  may  sound  strange,  but  some  bug  reports  we  receive are completely unrelated to
       youtube-dl and relate to a different, or even the  reporter's  own,  application.   Please
       make  sure  that you are actually using youtube-dl.  If you are using a UI for youtube-dl,
       report the bug to the maintainer of the actual application providing the UI.  On the other
       hand, if your UI for youtube-dl fails in some way you believe is related to youtube-dl, by
       all means, go ahead and report the bug.

COPYRIGHT

       youtube-dl is released into the public domain by the copyright holders.

       This README file was originally written by Daniel Bolton (https://github.com/dbbolton) and
       is likewise released into the public domain.

                                                                                    YOUTUBE-DL(1)