Provided by: opus-tools_0.1.10-1_amd64 bug


       opusenc - encode audio into the Opus format


       opusenc  [  -h  ] [ -V ] [ --help-picture ] [ --quiet ] [ --bitrate kbit/sec ] [ --vbr ] [
       --cvbr ] [ --hard-cbr ] [ --comp complexity ] [ --framesize 2.5, 5, 10, 20,  40,  60  ]  [
       --expect-loss  pct  ] [ --downmix-mono ] [ --downmix-stereo ] [ --max-delay ms ] [ --title
       'track title' ] [ --artist author ] [ --album 'album title' ] [ --genre genre ]  [  --date
       YYYY-MM-DD  ] [ --comment tag=value ] [ --picture filename|specification ] [ --padding n ]
       [ --discard-comments ] [ --discard-pictures ] [ --raw  ]  [  --raw-bits  bits/sample  ]  [
       --raw-rate  Hz  ] [ --raw-chan N ] [ --raw-endianness flag ] [ --ignorelength ] [ --serial
       serial number ] [ --save-range file ] [ --set-ctl-int ctl=value ] input.wav output.opus


       opusenc reads audio data in Wave, AIFF, FLAC, Ogg/FLAC, or raw PCM format and  encodes  it
       into  an  Ogg  Opus  stream.  If  the  input  file  is  "-" audio data is read from stdin.
       Likewise, if the output file is "-" the Ogg Opus stream is written to stdout.

       Unless quieted opusenc displays fancy statistics about the encoding progress.


   General options
       -h, --help
              Show command help

       -V, --version
              Show the version number

              Show help on attaching album art

              Enable quiet mode. No messages are displayed.

   Encoding options
       --bitrate N.nnn
              Set target bitrate in kbit/sec (6-256 per channel)

              In VBR mode this specifies the average rate for a large and diverse  collection  of
              audio. In CVBR and Hard-CBR mode it specifies the specific output bitrate.

              Default for >=44.1kHz input is 64kbps per mono stream, 96kbps per coupled pair.

       --vbr  Use  variable bitrate encoding (default) In VBR mode the bitrate may go up and down
              freely depending on the content to achieve more consistent quality.

       --cvbr Use constrained variable bitrate encoding.

              Outputs to a specific bitrate. This mode is analogous to CBR  in  AAC/MP3  encoders
              and  managed  mode in Vorbis coders. This delivers less consistent quality than VBR
              mode but consistent bitrate.

              Use hard constant bitrate encoding.

              With hard-cbr every frame will be exactly the same  size,  similar  to  how  speech
              codecs  work.  This  delivers  lower  overall  quality  but is useful where bitrate
              changes might leak data in encrypted channels or on synchronous transports.

       --comp N
              Set encoding computational complexity (0-10, default: 10). Zero gives  the  fastest
              encodes but lower quality, while 10 gives the highest quality but slower encoding.

       --framesize N
              Set maximum frame size in milliseconds (2.5, 5, 10, 20, 40, 60, default: 20)
              Smaller framesizes achieve lower latency but less quality at a given bitrate.
              Sizes greater than 20ms are only interesting at fairly low bitrates.

       --expect-loss N
              Set expected packet loss in percent (default: 0)

              Downmix to mono

              Downmix to stereo (if >2 channels input)

       --max-delay N
              Set maximum container delay in milliseconds (0-1000, default: 1000)

   Metadata options
       --title title
              Set the track title comment field to title

       --artist artist
              Set  the  artist  comment field to artist.  This may be used multiple times to list
              contributing artists individually.  Note  that  some  playback  software  does  not
              display multiple artists gracefully.

       --album album
              Set the album or collection title field to album

       --date YYYY-MM-DD
              Set  the  date  comment  field  to YYYY-MM-DD.  This may be shortened to YYYY-MM or

       --genre genre
              Set the genre comment field to genre.  This option may be specified multiple  times
              to tag a track with multiple overlapping genres.

       --comment tag=value
              Add  an extra comment.  This may be used multiple times.  The argument should be in
              the form "tag=value".  See the vorbis-comment  specification  for  well  known  tag

       --picture filename|specification
              Attach album art for the track.

              Either  a  filename  for  the  artwork or a more complete specification form can be
              used.  The picture is added to a METADATA_BLOCK_PICTURE comment  field  similar  to
              what is used in FLAC.  The specification is a string whose parts are separated by |
              (pipe) characters.  Some parts may be left empty to invoke default values.  Passing
              a plain filename is just shorthand for the "||||filename" specification.

              The         format         of         specification        is        [type]|[media-

              type is an optional number describing the nature of the  picture.   Defined  values
              are from one of:

                0: Other
                1: 32x32 pixel 'file icon' (PNG only)
                2: Other file icon
                3: Cover (front)
                4: Cover (back)
                5: Leaflet page
                6: Media (e.g., label side of a CD)
                7: Lead artist/lead performer/soloist
                8: Artist/performer
                9: Conductor
               10: Band/Orchestra
               11: Composer
               12: Lyricist/text writer
               13: Recording location
               14: During recording
               15: During performance
               16: Movie/video screen capture
               17: A bright colored fish
               18: Illustration
               19: Band/artist logotype
               20: Publisher/studio logotype

              The default is 3 (front cover).  More than one --picture option can be specified to
              attach multiple pictures.  There may only be one picture each of type 1 and 2 in  a

              media-type  is optional. If left blank, it will be detected from the file. For best
              compatibility with players,  use  pictures  with  a  media-type  of  image/jpeg  or
              image/png. The media-type can also be "-->" to mean that filename is actually a URL
              to an image, though this use is discouraged.  The file  at  the  URL  will  not  be
              fetched.  The URL itself is stored in the metadata.

              description is optional. The default is an empty string.

              The  next part specifies the resolution and color information. If the media-type is
              image/jpeg, image/png, or image/gif,  this  can  usually  be  left  empty  and  the
              information  will  be read from the file.  Otherwise, you must specify the width in
              pixels, height in pixels, and color depth  in  bits-per-pixel.  If  the  image  has
              indexed  colors  you  should  also  specify the number of colors used. If possible,
              these are checked against the file for accuracy.

              filename is the path to the picture file to be imported, or the URL if  the  media-
              type is "-->".

       --padding n
              Reserve  n  extra  bytes  for  metadata  tags. This can make later tag editing more
              efficient. Defaults to 512.

              Don't propagate metadata tags from the input file.

              Don't propagate pictures or art from the input file.

   Input options
       --raw  Interpret input as raw PCM data without headers

       --raw-bits N
              Set bits/sample for raw input (default: 16)

       --raw-rate N
              Set sampling rate for raw input (default: 48000)

       --raw-chan N
              Set number of channels for raw input (default: 2)

       --raw-endianness [0/1]
              Set the endianness for raw input: 1 for big endian, 0 for little (default: 0)

              Ignore the data length in Wave headers. Opusenc automatically  ignores  the  length
              when its implausible (very small or very large) but some STDIN usage may still need
              this option to avoid truncation.

   Diagnostic options
       --serial n
              Force use of a specific stream serial number, rather  than  one  that  is  randomly
              generated.   This  is used to make the encoder deterministic for testing and is not
              generally recommended.

       --save-range file
              Save check values for every frame to a file

       --set-ctl-int x=y
              Pass the encoder control x with value y (advanced).  Preface with s: to direct  the
              ctl to multistream s
              This may be used multiple times


       Simplest usage. Take input as input.wav and produce output as output.opus:
              opusenc input.wav output.opus

       Produce a very high quality encode with a target rate of 160kbps:
              opusenc --bitrate 160 input.wav output.opus

       Record and send a live stream to an Icecast HTTP streaming server using oggfwd:
              arecord   -c   2   -r  48000  -twav  -  |  opusenc  --bitrate  96  -   -  |  oggfwd
     8000 password /stream.opus


       While it is possible to use opusenc for low latency streaming (e.g. with  --max-delay  set
       to  0  and  netcat  instead  of  Icecast)  it's  not really designed for this, and the Ogg
       container and TCP transport aren't the best tools for that  application.  Shell  pipelines
       themselves  will often have high buffering. The ability to set framesizes as low as 2.5 ms
       in opusenc mostly exists to try out the quality of the format with low  latency  settings,
       but not really for actual low latency usage.
       Interactive usage should use UDP/RTP directly.


       Gregory Maxwell <>


       opusdec(1), opusinfo(1), oggfwd(1)