Provided by: gpac_0.5.2-426-gc5ad4e4+dfsg5-5_amd64 bug

NAME

       MP4Box - MPEG-4 Systems Toolbox

SYNOPSIS

       MP4Box [options] file [options]

DESCRIPTION

       MP4Box  is  a  multi-purpose  command  line  tool  to  create  and  edit MPEG-4 Systems presentations and
       manipulate ISO-media files (MP4, 3GP, MOV).

       MP4Box supports file conversion from various raw formats and  IsoMedia/AVI/MPEG-PS/OGG  containers,  file
       hinting   for  RTP  streaming  for  QuickTime  compatible  streaming  servers,  file  interleaving,  file
       fragmentation and track extraction.

       MP4Box also provides dump tools used to inspect file layout, RTP  hint  tracks,  SDP  information,  scene
       composition. It may also be used to convert to and from BT/XMT-A/VRML/X3D.

       MP4Box also features MPEG-4 Systems encoders and decoders for BIFS and OD tools.

       MP4Box doesn't expect any particular order in options at prompt.

GETTING HELP WITH MP4Box

       -h [type]
              prints help screen. "type" can be one of "general", "hint", "import", "encode", "extract", "dump",
              "swf", "meta", "crypt", "format", "rtp", "live" for specific help.

       -version
              prints version of MP4Box.

       -noprog
              disable progress reports.

       -quiet quiet mode (no log info).

       -v     verbose mode (more log info).

       -strict-error
              exits after the first error is reported.

       -nodes lists supported MPEG-4 Systems nodes in MP4Box current build.

       -node NodeName
              prints the node syntax. Each field is listed as
              eventType fieldType fieldName defaultValue
              and field quantization information and quantization bounds if any.

       -xnodes
              lists supported X3D nodes in MP4Box current build.

       -xnode NodeName
              prints the X3D node syntax. Each field is listed as

       -snodes
              lists supported SVG/LASeR nodes in MP4Box current build.

GENERAL OPTIONS

       -inter duration
              interleaves media data in chunks of the maximum specified duration (expressed in milliseconds) and
              prepare file for HTTP/FTP streaming. By default MP4Box always stores with 0.5 second interleaving.
              An interleaving value of '0' stores without interleaving (meta-data then track after track).
              -old-inter duration same as -inter but without drift adjustment
              NOTE: Track Edit Lists are ignored when performing interleaving.

       -flat  stores file with all media data first, non interleaved. If used  when  creating  a  new  file,  no
              temporary file is created (faster storage).

       -frag duration
              fragments  file  using  ISO-Media  movie fragments. Tracks will be fragmented so that no track run
              exceeds the specified duration (expressed in milliseconds). Disables interleaving.

       -out <filename>
              specifies output file name.

       -tmp <dirname>
              specifies driectory for temporary storage. If not set, temporary storage is OS-dependent.

       -ffspace size
              inserts free space before moof in fragmented files.

       -nosys removes all MPEG-4  Systems  information  from  the  file  but  keeps  an  empty  IOD  for  MPEG-4
              Profile@Level indications. alias: -no-sys

       -no-iod
              removes InitialObjectDescriptor from file.

       -isma  rewrites  the  file as an ISMA 1.0 Audio/Video file (all systems info rewritten) with proper clock
              references.

       -ismax rewrites the file as an ISMA 1.0 Audio/Video file (all systems info  rewritten)  with  ISMA  clock
              references (streams not explicetly synchronized).
              NOTE:  Seeking  may be broken with some players (in ISMA, audio and video streams do not depend on
              main scene clock).

       -3gp   rewrites the file as a 3GP file (no more MPEG-4 Systems specific info). This option is  turned  on
              by default when input file extension is .3gp or .3g2.

       -ipod  rewrites the file for iPod.

       -brand ABCD[:v]
              sets major brand of file, with optional version.

       -ab ABCD
              adds given brand to file's alternate brand list.

       -rb ABCD
              removes given brand to file's alternate brand list.

       -cprt string
              adds string copyright notice to file.

       -chap chap_file
              adds chapter information contained in chap_file to movie. For more details on chapter file syntax,
              cf http://gpac.sourceforge.net/auth_mp4box.php.

       -rem trackID
              removes given track from file - can be specified multiple times.

       -enable trackID
              enables given track.

       -disable trackID
              disables given track.

       -new   forces creation of a new destination file.

       -lang [tkID=]LAN
              sets the language of all tracks or the given track. LAN is the ISO 639-2 3 character code.

       -delay [tkID=]delay_ms
              sets the delay in milliseconds of all tracks or the given track. LAN is the ISO 639-2 3  character
              code.

       -par tkID=PAR
              sets visual track pixel aspect ratio (PAR=Num:Den or "none").

       -name tkID=name
              sets track handler name.

       -itags tag1[:tag2]
              sets iTunes tags to file - more info: MP4Box -tag-list.

       -split time_in_seconds
              splits in files of desired maximum duration. This will remove all MPEG-4 Systems media.

       -split-size size_in_kilobytes
              splits in files of desired maximum size. This will remove all MPEG-4 Systems media. Alias: -splits

       -split-chunk start:end
              extracts  a  new  file from specified start to end times (in seconds). This will remove all MPEG-4
              Systems media. Alias: -splitx

       -splitz start:end
              same as -split-chunk option, but adjust end time to be juste before the  last  rap  found  in  the
              chunk.

       -split-rap start:end
              splits in files begining at each RAP. This will remove all MPEG-4 Systems media. Alias: -splitr

       -group-add fmt
              creates  a  new  grouping  information  in the file. Format is a colon-separated list of following
              options:
              refTrack=ID: ID of the track used as a group reference. If not set, the track will belong  to  the
              same group as the previous trackID specified. If 0 or no previous track specified, a new alternate
              group will be created.
              switchID=ID: ID of the switch group to create. If 0, a new ID will be computed  for  you.  If  <0,
              disables SwitchGroup.
              criteria=string: list of space-separated 4CCs.
              trackID=ID: ID of the track to add to this group.
              *WARNING*  Options modify state as they are parsed: trackID=1:criteria=lang:trackID=2 is different
              from: criteria=lang:trackID=1:trackID=2.  -group-rem-track ID removes track from its group.

       -group-rem ID
              removes the track's group.

       -group-clean
              removes all group information from all tracks.

       -ref id:XXXX:refID
              adds a reference of type 4CC from track ID to track refID.

       -dash DUR
              enables DASH-ing of the file with a segment duration of DUR.

       -rap   segments begin with random access points.

       -frags-per-sidx N
              sets the number of segments to be written in each SIDX box.

       -segment-name name
              sets the segment name for generated segments.

       -segment-ext name
              sets the segment extension name. Default is m4s.

       -url-template
              uses UrlTemplate instead of explicit sources in segments.

       -daisy-chain
              Uses daisy-chain SIDX instead of hierarchical. Ignored if frags/sidx is 0.

       -dash-ctx FILE
              Stores/restore DASH timing from FILE.

       -dash-ts-prog N
              Program_number to be considered in case of an MPTS input file.

              When input file is an ISO-Media file (QT, MP4, 3GP), if no output is specified THE INPUT  FILE  IS
              OVERWRITTEN.

HINTING OPTIONS

       -hint  hint  the  file for RTPRTSP sessions. Payload type is automatically detected and configured unless
              forced through one of MPEG-4 Generic RTP payload.

       -mtu size
              specifies Maximum Transmission Unit size in bytes (eg maximum RTP packet size).  Default  size  is
              1500  bytes  (Ethernet  MTU).  This  must  be choosen carefully: specifying too large packets will
              result in undesired packet fragmentation at UDP layer while  specifying  too  small  packets  will
              result in RTP header overhead.

       -copy  forces hinted data to be copied to the hint track instead of simply referenced. This speeds up RTP
              packet construction at the server side but results in much bigger files.

       -tight performs sample-based interleaving of media tracks and hint tracks. This should reduce disk  seeks
              at server side (depending on server implementation) but results in a bigger file.

       -multi [maxptime]
              enables  Access Units concatenation in RTP packets if possible. maxptime is optional and specifies
              the maximum packet duration in milliseconds (default 100).

       -rate ck_rate
              specifies the rtp rate in Hz when no default rate for payload. Default value is  90000  (MPEG  rtp
              rates).

       -mpeg4 forces  usage  of  the MPEG-4 generic payload whenever possible. Media tracks without a mapping to
              MPEG-4 Systems cannot use this.

       -latm  forces usage of the LATM payload for AAC audio.

       -static
              enables usage of static RTP payload IDs for streams with official payload IDs. By  default  MP4Box
              always  uses  dynamic  payload IDs for maximum interoperability, some players having troubles with
              static ones.

       MPEG-4 Generic Payload Options (Experts only)

              -ocr forces all media tracks in the file to be served synchronized. This is  needed  because  most
              streaming  servers  don't  support  desynchronized tracks in a single file. Be extremelly carefull
              when designing MPEG-4 interactive presentations for streaming since you will have to take care  of
              the  streaming  server  capabilities...  MP4Box  generates  warnings when the file timeline can be
              ambiguously interpreted by the server.

              -rap signals Access Units random access flag in RTP packets.  This  is  usually  only  needed  for
              streaming of MPEG-4 Systems streams.

              -ts signals Access Units Time Stamps (CTS and DTS) in RTP packets.

              -size signals Access Units size in RTP packets.

              -idx signals Access Units indexes (sequence numbers) in RTP packets.

              -multi  enables  Access  Units  concatenation  in RTP packets (-ts, -size and -idx are selected if
              needed).

              -iod prevents system tracks embedding in IOD  (ISMA-like  IOD)  when  generating  in  SDP.  MP4Box
              automatically detects ambiguous (ISMA/non-ISMA) files but nobody's perfect. This shouldn't be used
              with -isma option.

       -add-sdp string
              adds string to movie SDP or track SDP (tkID:string, where tkID is the OD of the hint track or  its
              media track). This takes care of SDP line reordering, but not of SDP content validity.

       -unhint
              removes all hint tracks and other hinting info from the file.

IMPORT OPTIONS

       -add <src_file>
              adds  all  src_file  tracks  to  input file, creating it if not exisiting. Up to 20 cumulated -add
              operations can be used. Supported syntaxes are:
              file#video: imports first video track from src_file.
              file#audio: imports first audio track from src_file.
              file#trackID=ID or file#ID: imports given trackfrom src_file. To get a listing of tracks in  input
              file, use -info [ID]
              [;lang=LAN]: specifies language of imported media.
              [;delay=delay_ms]: specifies initial delay in milliseconds of imported media.

       -cat <src_file>
              concatenates  all  src_file  tracks to input file, creating it if not exisiting. Media samples are
              added at the end of existing compatible tracks. If no compatible track is found for a media it  is
              created. Up to 20 cumulated -cat operations can be used. Syntax is the same as -add.

       -force-cat
              skips media configuration check when concatenating file.

       -keepsys
              by  default  all  MPEG-4  systems  media  are  removed  with -add and -cat. This option will avoid
              removing them from final file.

       -keep-all
              keeps all existing tracks when add file.

       -dref  keeps media data in original file an  only  imports  meta-data  (frame  timing,  size  and  random
              access).

       NOTE   Data  referencing may fail with some AVI because it requires the framed data (eg an MP4 sample) to
              be continuous in the original file, which is  not  always  the  case  depending  on  the  original
              interleaving.

       -no-drop
              forces  constant  FPS when importing AVI video. By default non coded frames (n-vop) are removed at
              import time, resulting in a variable frame-rate media.

       -packed
              for CMP/M4V (raw MPEG-4 Visual), forces packed-bitstream mode (removes all n-vops  and  import  at
              constant frame rate).

       -sbr   imports AAC as AAC-SBR, with backward compatible signaling (non AAC-SBR decoders should be able to
              play it).

       -sbrx  imports AAC as AAC-SBR, with non-backward compatible signaling (non AAC-SBR decoders will  not  be
              able to play it).

       -ovsbr imports AAC as AAC-SBR with oversample SBR.

       -ps    imports AAC as AAC-PS, with backward compatible signaling of AAC-PS.

       -psx   imports  AAC  as  AAC-PS,  with non-backward compatible signaling (non AAC-PS decoders will not be
              able to play it).

       -fps FrameRate
              overrides the input video frame rate or specifies it for SUB subtitles.

       -mpeg4 forces using MPEG-4 sample descriptions rather than 3GP ones (3GP2 QCELP/EVRC/SMV audio only).

       -agg N aggregates N audio frames in 1 sample (3GP media only). Maximum possible value is 15, and  default
              value is 1 (no aggregation).

ENCODING OPTIONS

       -mp4   specifies  input  file  is  for encoding. Supported inputs are BT/XMT-A/WRL/SWF files. Output file
              name is by default the input file name without extensions plus ".mp4" extension.

       -def   encodes DEF'ed nodes and routes with their textual names.

       -log   generates BIFS encoder log file.

       -ms file
              specifies file for track importing - by default FILE.mp4 is used when encoding  FILE.bt  (in-place
              rewrite).  This  option  is  only  needed  if you don't provide a proper muxInfo per stream in the
              BT/XMT file.

       -sync time
              forces BIFS random access point generation every time milliseconds. Cannot be used  with  -shadow.
              WARNING:  this  may result in weird behavior of your presentation since a BIFS random access point
              restarts all media currently running in the scene (EXPERTS ONLY - DANGEROUS). Cannot be used  with
              -shadow.

       -shadow time
              forces  BIFS  shadow  random  access points generation every time milliseconds. Shadow samples are
              random access points that can be used instead of non random access points when  seeking.  WARNING:
              this may be not supported by some players (EXPERTS ONLY - DANGEROUS). Cannot be used with -sync.

       -ctx-in file
              specifies  initial  context (MP4/BT/XMTA) for chunk processing. Input file must then be a command-
              only file: no IOD, and no implicit commands (commands without 'AT').

       -ctx-out file
              specifies output file of updated context (MP4/BT/XMTA) in chunk processing mode. This is optional,
              chunk processing doesn't need to store the final context.

       -resolution res
              LASeR  resolution  factor  (-8  to  7,  default  0).  All  coords  are  multiplied by 2^res before
              truncation.

       -coord-bits bits
              bits used for encoding truncated coordinates in LASeR. (0 to 31, default 12)

       -scale-bits bits
              bits used for encoding truncated scales in LASeR. (0 to 4, default 0)

       -auto-quant res
              Use automatic LASeR quantification. resolution is given as if using -resolution but coord-bits and
              scale-bits are infered.

ISMACRYPT OPTIONS

       -crypt drm_file
              crypts a specific track using ISMA AES CTR 128.

       -decrypt [drm_file]
              decrypts a specific track using ISMA AES CTR 128. drm_file can be omitted if keys are in file.

       -set-kms [tkID=]kms_uri
              changes KMS location for all tracks or a given one if tkID is specified.

       DRM file syntax for GPAC ISMACryp
              File is XML and shall start with xml header. File root is an "ISMACryp" element. File is a list of
              "ISMACrypTrack" elements.
              ISMACrypTrack attributes:
              TrackID: ID of track to en/decrypt.
              key:  AES-128 key formatted (hex string 0x +32 chars.
              salt: CTR IV salt key (64 bits) (hex string 0x +16 chars.
              Encryption only attributes
              Scheme_URI: URI of scheme used.
              KMS_URI: URI of key management system - ´self´ writes key and salt in the file.
              selectiveType selective encryption type - understood values are "None":               all  samples
              encrypted  (default),  "RAP":   only  encrypts random access units, "Non-RAP":  only encrypts non-
              random access units, "Rand": random selection is performed", "X": Encrypts every first sample  out
              of X, "RandX": Encrypts one random sample out of X.
              ipmpType: IPMP Signaling Type: None, IPMP, IPMPX.
              ipmpDescriptorID:  IPMP_Descriptor  ID  to use if IPMP(X) is used. If not set MP4Box will generate
              one for you.

EXTRACTING OPTIONS

       -raw TrackID
              extracts given track in native format when supported.

       -raws TrackID
              extract each track sample to a file. Note: 'TrackID:N' extracts Nth sample of the track.

       -nhnt TrackID
              extracts given track in NHNT format. All  track  types  except  ObjectDescriptors  tracks  can  be
              exported.

       -nhml TrackID
              extracts  track  in nhml format (XML nhnt). All track types except ObjectDescriptors tracks can be
              exported.

       -single TrackID
              extracts given track to a new mp4 file with a single track.

       -avi TrackID
              extracts visual track to an avi file.

       -qcp TrackID
              same as '-raw' but defaults to QCP file format for AVRC and SMV audio codecs.

       -aviraw TK
              extracts AVI track to its raw format. TK can be one of "video", "audio"  or  "audioN"  for  multi-
              track avi files (cf '-info').

       -saf   remux file to SAF multiplex.

       -dvbhdemux
              demux DVB-H file into IP Datagrams.

       -diod  extracts file IOD in raw format when supported.

DUMP OPTIONS

       -info [TrackID]
              prints  movie  and  tracks  information.  If TrackID specified, dumps only extended track info. If
              input file is not an IsoMedia file, lists known tracks for import.

       -bt    dumps complete scene in a BT file. This will remove unknown MPEG4 nodes.

       -xmt   dumps complete scene in an XMT-A file. This will remove unknown MPEG4 nodes.

       -wrl   dumps complete scene in an VRML97 WRL file. This will remove unknown VRML97 nodes.

       -x3d   dumps complete scene in an X3D XML file. This will remove unknown X3D nodes.

       -x3dv  dumps complete scene in an X3D Text (VRML) file. This will remove unknown X3D nodes.

       -lsr   dumps complete scene in a LASeR+XML file.

       -diso  creates XML image of the file atoms.

       -drtp  creates XML image of all hint tracks samples of a hinted mp4 file.

       -dts   prints sample timing to text output.

       -dcr   creates XML image of all ISMACryp tracks samples of an mp4 file.

       -sdp   creates SDP file associated with a hinted mp4 file.

       -dump-cover
              Extracts cover art if any.

       -dump-chap
              Extracts chapter list to file if any.

       -ttxt  converts input subtitle to GPAC TTXT format.

       -ttxt trackID
              exports given text track to GPAC TTXT format.

       -srt   converts input subtitle to SRT format.

       -srt trackID
              exports given text track to SRT subtitle format.

       -std   dumps to stdout rather than file.

       -stat  generates statitistic report on node/field usage for the whole presentation.

       -stats generates statistic report on node/field usage per BIFS Access Unit.

       -statx generates statistic report on node/field usage in the scene graph after each BIFS Access Unit.

       -hash  generates SHA-1 Hash of the input file.

Meta OPTIONS

       MP4Box supports the Meta addition to IsoMedia file format, used to make the file a generic data container
       (timed or untimed).

       -set-meta args
              sets meta object type. Syntax is "ABCD[;tk=N] where:
              ABCD is the four character code of the type, or O/NULL to remove the meta object
              tk  indicates  whether the meta is at the root level (no "tk"), at the moov level (tk=0) or at the
              track level (tk=trackID).

       -add-item args
              adds resource to the given meta. args is the item file path followed by ';' separated options:
              tk=N: same as above
              name=item_name: specifies the item name, otherwise file name is used
              mime=mimeType: specifies the item mime type, otherwise application/octet-stream is used
              encoding=enctype: specifies the content encoding type Note that file path set to "this" or  "self"
              will identify the item added as the whole IsoMedia file

       -rem-item args
              removes item from given meta. Syntax is itemID[;tk=ID].

       -set-primary args
              sets given item as the primary one of the given meta. Syntax is itemID[;tk=ID].

       -set-xml args
              sets XML to the given meta. Syntax is xml_file_path[;tk=ID][;binary].

       -rem-xml [tk=ID]
              removes XML data from the given meta.

       -dump-xml xml_out_file_name[;tk=ID]
              dumps the XML data of the given meta to a file.

       -dump-item itemID[;tk=ID][;path=fileName]
              dumps  the  given  item  of  the the given meta to a file. By default the item name is used as the
              output file name.

       -package
              packages input XML file into an ISO container. all media referenced except hyperlinks are added to
              file.

       -mgt   packages input XML file into an MPEG-U widget in ISO container. All files contained in the current
              folder are added to the widget package.

RTP STREAMER OPTIONS

       MP4Box can stream ISO files to RTP. The streamer currently doesn't support data  carrouselling  and  will
       therefore not handle BIFS and OD streams properly.

       -rtp   enables rtp file streamer.

       -noloop
              disables looping when streaming.

       -mpeg4 forces MPEG-4 ES Generic for all RTP streams.

       -dst=IP
              IP destination (uni/multi-cast). Default: 127.0.0.1.

       -port=PORT
              output port of the first stream. Default: 7000.

       -mtu=MTU
              path MTU for RTP packets. Default is 1450 bytes.

       -ifce=IP
              IP address of the physical interface to use. Default: NULL (ANY).

       -ttl=N time to live for multicast packets. Default: 1.

       -sdp=FILE
              file name of the generated SDP. Default is session.sdp.

LIVE SCENE STREAMER OPTIONS

       MP4Box  can  stream  BIFS  or  DIMS  content  to  RTP  with carousel generation and updates. The streamer
       currently doesn't support audio/video/image streaming at the same time. All options supported by the file
       streamer are supported.

       -live  enables rtp live streamer.

       -dims  turns on DIMS mode for SVG input - default: off.

       -src=FILE
              source of updates - default: null.

       -rap=TIME
              duration  in  ms  of  base carousel - default: 0 (off). you can specify the RAP period of a single
              ESID (not in DIMS) with -rap=ESID=X:time.

       Runtime Options
              The following options can be used at prompt:
              q: quits
              u: inputs some commands to be sent
              U: same as u but signals the updates as critical
              e: inputs some commands to be sent without being aggregated
              E: same as e but signals the updates as critical
              f: forces RAP sending
              F: forces RAP regeneration and sending
              p: dumps current scene

SWF OPTIONS

       MP4Box can import very simple Macromedia Flash files (".SWF"). You can specify a SWF input file with -bt,
       xmt and -mp4 switches.

       -global
              all SWF defines are placed in first scene replace. By default SWF defines are sent when needed.

       -no-ctrl
              uses a dedicated stream for movie control. This will disable ActionScript.

       -no-text
              removes all SWF text.

       -no-font
              removes all embedded SWF Fonts, forcing usage of MPEG-4 Text and terminal fonts.

       -no-line
              removes all lines from SWF shapes.

       -no-grad
              removes all gradients from swf shapes.

       -quad  uses quadratic bezier curves instead of cubic ones.

       -xlp   support for lines transparency and scalability.

       -flatten Value
              replaces  2  consecutive  lines  by  a  single  one  when  angle  between lines is less than Value
              (expressed in radians). Value 0 disables flattening.

SUPPORTED INPUT FORMATS

       RAW Formats and extensions

              NHNT (.media .nhnt .info)
              MPEG Audio (.mp3)
              ADTS-AAC (.aac)
              MPEG-4 Visual (.cmp .m4v)
              H263 Video (.263 .h263)
              AVC/H264 Video (.h264 .h26L .264 .26L)
              JPEG Images (.jpg .jpeg)
              PNG Images (.png)
              AMR(WB) Audio (.amr .awb)
              EVRC Audio (.evc)
              SMV Audio (.smv)

       Container Formats and extensions

              AVI (.avi)
              MPEG-PS (.mpg .mpeg .vob .vcd .svcd)
              QCP (.qcp)
              OGG (.ogg)
              ISO-Media files (no extension checking)

       Text Formats and extensions

              SRT Subtitles (.srt)
              SUB Subtitles (.sub)
              GPAC Timed Text (.ttxt)
              QuickTime TeXML Text (.xml)  (cf QT documentation)

       Scene Formats and extensions

              MPEG-4 XMT-A (.xmt .xmta .xmt.gz .xmta.gz)
              MPEG-4 BT (.bt .bt.gz)
              VRML (.wrl .wrl.gz)
              X3D-XML (.x3d .x3d.gz)
              X3D-VRML (.x3dv .x3dv.gz)
              MacroMedia Flash (.swf) - very limitted import support only

COMMON USAGE

       Importing a file

              Import an AVI: MP4Box -add myfile.avi mymp4.mp4
              Import audio from an AVI: MP4Box -add myfile.avi#audio mymp4.mp4
              Import video from an AVI: MP4Box -add myfile.avi#video mymp4.mp4
              Import an MP3 and leave data outside: MP4Box -dref -add myfile.mp3 mymp4.mp4
              Import a JPEG or PNG: MP4Box -add myfile.jpg mymp4.mp4
              Create a movie with subtitle: MP4Box -add video.avi -add audio.mp3 -add Subtitle.srt mymp4.mp4

       Base File operations

              Convert file for HTTP/FTP streaming: MP4Box -inter 1000 myfile.mp4
              Convert unknown file to ISMA for HTTP/FTP streaming: MP4Box -isma -inter 1000 myfile.mp4
              Convert unknown file to ISMA and respect ISMA broken sync: MP4Box -ismax myfile.mp4
              Convert unknown file to 3GP : MP4Box -3gp myfile.mp4

       Hinting a File

              Prepare any mp4 for ISMA streaming: MP4Box -isma -hint myfile.mp4
              Prepare any 3GP for streaming: MP4Box -hint myfile.3gp
              Prepare any 3GP for streaming with RTP aggregation : MP4Box -hint -multi myfile.3gp
              Prepare a simple audio/video mp4 optimized for server: MP4Box -hint -copy -tight myfile.mp4
              Prepare a complex mp4 with BIFS for streaming: MP4Box -ocr -iod -hint myfile.mp4

       Encoding/Decoding a file

              Encode a BT file and keep node names for later inspection: MP4Box -mp4 -def pres.bt
              Encode a XMT-A file: MP4Box -mp4 pres.xmt
              Translate BT to XMT-A file: MP4Box -xmt pres.bt
              Translate XMT-A to BT file: MP4Box -bt pres.xmt
              Decode MP4 to BT: MP4Box -bt pres.mp4

BUGS and OTHER HELP

       For bug reports, more information on BT or XMT-A formats or GPAC TTXT files or ISMACryp,  MPEG-4  Systems
       usage and more help on MP4Box please visit the GPAC web site http://gpac.sourceforge.net

AUTHORS

       Jean Le Feuvre <jeanlf@users.sourceforge.net> - GPAC (c) 2000-2005 - (c) Telecom ParisTech 2005-2011

SEE ALSO

       GPAC(1), MP4Client(1)