mp4box - Man Page

• Display information about an existing MP4 file: mp4box -info path/to/file
• Add an SRT subtitle file into an MP4 file: mp4box -add input_subs.srt:lang=eng -add input.mp4 output.mp4
• Combine audio from one file and video from another: mp4box -add input1.mp4#audio -add input2.mp4#video output.mp4

tldr.sh

MP4Box [options] [file] [options]

MP4Box is a multimedia packager, with a vast number of functionalities: conversion, splitting, hinting, dumping, DASH-ing, encryption, transcoding and others.
MP4Box provides a large set of options, classified by categories (see .I -h). These options do not follow any particular ordering.
 
By default, MP4Box rewrites the input file. You can change this behavior by using the .I out option.
MP4Box stores by default the file with 0.5 second interleaving and meta-data (moov ...) at the beginning, making it suitable for HTTP download-and-play. This may however takes longer to store the file, use .I flat to change this behavior.
 
MP4Box usually generates a temporary file when creating a new IsoMedia file. The location of this temporary file is OS-dependent, and it may happen that the drive/partition the temporary file is created on has not enough space or no write access. In such a case, you can specify a temporary file location with .I tmp.
 
Track identifier for track-based operations (usually referred to as tkID in the help) use the following syntax:
* INT: target is track with ID INT
* n`INT`: target is track number INT
* `audio`, `video`, `text`: target is first audio, video or text track
* `audioN`, `videoN`, `textN`: target is the Nth audio, video or text track, with N=1 being the first track of desired type
 
Option values:
Unless specified otherwise, a track operation option of type integer expects a track identifier value following it.
An option of type boolean expects no following value.
 

-mem-track

enable memory tracker

-mem-track-stack

enable memory tracker with stack dumping

-p (string)

use indicated profile for the global GPAC config. If not found, config file is created. If a file path is indicated, this will load profile from that file. Otherwise, this will create a directory of the specified name and store new config there. Reserved name 0 means a new profile, not stored to disk. Works using -p=NAME or -p NAME

-inter (number, default: 0.5)

interleave file, producing track chunks with given duration in ms. A value of 0 disables interleaving

-old-inter (number)

same as .I inter but without drift correction

-tight

tight interleaving (sample based) of the file. This reduces disk seek operations but increases file size

-flat

store file with all media data first, non-interleaved. This speeds up writing time when creating new files

-frag (number)

fragment file, producing track fragments of given duration in ms. This disables interleaving

-out (string)

specify ISOBMFF output file name. By default input file is overwritten

-co64

force usage of 64-bit chunk offsets for ISOBMF files

-new

force creation of a new destination file

-newfs

force creation of a new destination file without temp file but interleaving support

-no-sys,-nosys

remove all MPEG-4 Systems info except IOD, kept for profiles. This is the default when creating regular AV content

-no-iod

remove MPEG-4 InitialObjectDescriptor from file

-mfra

insert movie fragment random offset when fragmenting file (ignored in dash mode)

-isma

rewrite the file as an ISMA 1.0 file

-ismax

same as .I isma and remove all clock references

-3gp

rewrite as 3GPP(2) file (no more MPEG-4 Systems Info), always enabled if destination file extension is .3gp, .3g2 or .3gpp. Some tracks may be removed in the process

-ipod

rewrite the file for iPod/old iTunes

-psp

rewrite the file for PSP devices

-brand (string)

set major brand of file (ABCD) or brand with optional version (ABCD:v)

-ab (string)

add given brand to file's alternate brand list

-rb (string)

remove given brand to file's alternate brand list

-cprt (string)

add copyright string to file

-chap (string)

set chapter information from given file. The following formats are supported (but cannot be mixed) in the chapter text file:
 * ZoomPlayer: AddChapter(nb_frames,chapter name), AddChapterBySeconds(nb_sec,chapter name) and AddChapterByTime(h,m,s,chapter name) with 1 chapter per line
 * Time codes: h:m:s chapter_name, h:m:s:ms chapter_name and h:m:s.ms chapter_name with 1 chapter per line
 * SMPTE codes: h:m:s;nb_f/fps chapter_name and h:m:s;nb_f chapter_name with nb_f the number of frames and fps the framerate with 1 chapter per line
 * Common syntax: CHAPTERX=h:m:s[:ms or .ms] on first line and CHAPTERXNAME=name on next line (reverse order accepted)

-chapqt (string)

set chapter information from given file, using QT signaling for text tracks

-set-track-id tkID:id2

change id of track to id2

-swap-track-id tkID1:tkID1

swap the id between tracks with id1 to id2

-rem (int)

remove given track from file

-rap (int)

remove all non-RAP samples from given track

-refonly (int)

remove all non-reference pictures from given track

-enable (int)

enable given track

-disable (int)

disable given track

-timescale (int, default: 600)

set movie timescale to given value (ticks per second)

-lang [tkID=]LAN

set language. LAN is the BCP-47 code (eng, en-UK, ...). If no track ID is given, sets language to all tracks

-delay tkID=TIME

set track start delay (>0) or initial skip (<0) in ms or in fractional seconds (N/D)

-par tkID=PAR

set visual track pixel aspect ratio. PAR is:
 * N:D: set PAR to N:D in track, do not modify the bitstream
 * wN:D: set PAR to N:D in track and try to modify the bitstream
 * none: remove PAR info from track, do not modify the bitstream
 * auto: retrieve PAR info from bitstream and set it in track
 * force: force 1:1 PAR in track, do not modify the bitstream

-clap tkID=CLAP

set visual track clean aperture. CLAP is Wn,Wd,Hn,Hd,HOn,HOd,VOn,VOd or none
* n, d: numerator, denominator
* W, H, HO, VO: clap width, clap height, clap horizontal offset, clap vertical offset

-mx tkID=MX

set track matrix, with MX is M1:M2:M3:M4:M5:M6:M7:M8:M9 in 16.16 fixed point integers or hexa

-kind tkID=schemeURI=value

set kind for the track or for all tracks using all=schemeURI=value

-kind-rem tkID=schemeURI=value

remove kind if given schemeID for the track or for all tracks with all=schemeURI=value

-name tkID=NAME

set track handler name to NAME (UTF-8 string)

-tags,-itags (string)

set iTunes tags to file, see -h tags

-group-add (string)

create a new grouping information in the file. Format is a colon-separated list of following options:
* refTrack=ID: 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: 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 (int)

remove given track from its group

-group-rem (int)

remove the track's group

-group-clean

remove all group information from all tracks

-ref tkID:R4CC:refID

add a reference of type R4CC from track ID to track refID (remove track reference if refID is 0)

-keep-utc

keep UTC timing in the file after edit

-udta tkID:[OPTS]

set udta for given track or movie if tkID is 0. OPTS is a colon separated list of:
* type=CODE: 4CC code of the UDTA (not needed for box= option)
* box=FILE: location of the udta data, formatted as serialized boxes
* box=base64,DATA: base64 encoded udta data, formatted as serialized boxes
* src=FILE: location of the udta data (will be stored in a single box of type CODE)
* src=base64,DATA: base64 encoded udta data (will be stored in a single box of type CODE)
* str=STRING: use the given string as payload for the udta box
Note: If no source is set, UDTA of type CODE will be removed

-patch [tkID=]FILE

apply box patch described in FILE, for given trackID if set

-bo

freeze the order of boxes in input file

-init-seg (string)

use the given file as an init segment for dumping or for encryption

-zmov

compress movie box according to ISOBMFF box compression or QT if mov extension

-xmov

same as zmov and wraps ftyp in otyp

-edits tkID=EDITS

set edit list. The following syntax is used (no separators between entries):
* `r`: removes all edits
* `eSTART`: add empty edit with given start time. START can be
  - VAL: start time in seconds (int, double, fraction), media duration used as edit duration
  - VAL-DUR: start time and duration in seconds (int, double, fraction)
* `eSTART,MEDIA[,RATE]`: add regular edit with given start, media start time in seconds (int, double, fraction) and rate (fraction or INT)
* Examples:
  - re0-5e5-3,4: remove edits, add empty edit at 0s for 5s, then add regular edit at 5s for 3s starting at 4s in media track
  - re0-4,0,0.5: remove edits, add single edit at 0s for 4s starting at 0s in media track and playing at speed 0.5

-moovpad (int)

specify amount of padding to keep after moov box for later inplace editing - if 0, moov padding is disabled

-no-inplace

disable inplace rewrite

-hdr (string)

update HDR information based on given XML, 'none' removes HDR info

-time [tkID=]DAY/MONTH/YEAR-H:M:S

set movie or track creation time

-mtime tkID=DAY/MONTH/YEAR-H:M:S

set media creation time

MP4Box can be used to extract media tracks from MP4 files. If you need to convert these tracks however, please check the filters doc.
 
Options:

-raw (string)

extract given track in raw format when supported. Use tkID:output=FileName to set output file name

-raws (string)

extract each sample of the given track to a file. Use tkID:N to extract the Nth sample

-nhnt (int)

extract given track to NHNT format

-nhml (string)

extract given track to NHML format. Use tkID:full for full NHML dump with all packet properties

-webvtt-raw (string)

extract given track as raw media in WebVTT as metadata. Use tkID:embedded to include media data in the WebVTT file

-single (int)

extract given track to a new mp4 file

-six (int)

extract given track as raw media in experimental XML streaming instructions

-mux (string)

multiplex input file to given destination

-qcp (int)

same as .I raw but defaults to QCP file for EVRC/SMV

-saf

multiplex input file to SAF multiplex

-dvbhdemux

demultiplex DVB-H file into IP Datagrams sent on the network

-raw-layer (int)

same as .I raw but skips SVC/MVC/LHVC extractors when extracting

-diod

extract file IOD in raw format

-mpd (string)

convert given HLS or smooth manifest (local or remote http) to MPD - options -url-template and -segment-timelinecan be used in this mode.  
Note: This only provides basic conversion, for more advanced conversions, see gpac -h dasher
 
Warning: This is not compatible with other DASH options and does not convert associated segments

Also see:
- the dasher `gpac -h dash` filter documentation
- [[DASH wiki|DASH-intro]].

Input media files to dash can use the following modifiers
* #trackID=N: only use the track ID N from the source file
* #N: only use the track ID N from the source file (mapped to .I -tkid)
* #video: only use the first video track from the source file
* #audio: only use the first audio track from the source file
* :id=NAME: set the representation ID to NAME. Reserved value NULL disables representation ID for multiplexed inputs. If not set, a default value is computed and all selected tracks from the source will be in the same output multiplex.
* :dur=VALUE: process VALUE seconds (fraction) from the media. If VALUE is longer than media duration, last sample duration is extended.
* :period=NAME: set the representation's period to NAME. Multiple periods may be used. Periods appear in the MPD in the same order as specified with this option
* :BaseURL=NAME: set the BaseURL. Set multiple times for multiple BaseURLs
Warning: This does not modify generated files location (see segment template).
* :bandwidth=VALUE: set the representation's bandwidth to a given value
* :pdur=VALUE: sets the duration of the associated period to VALUE seconds (fraction) (alias for period_duration:VALUE). This is only used when no input media is specified (remote period insertion), e.g. :period=X:xlink=Z:pdur=Y
* :ddur=VALUE: override target DASH segment duration to VALUE seconds (fraction) for this input (alias for duration:VALUE)
* :xlink=VALUE: set the xlink value for the period containing this element. Only the xlink declared on the first rep of a period will be used
* :asID=VALUE: set the AdaptationSet ID to VALUE (unsigned int)
* :role=VALUE: set the role of this representation (cf DASH spec). Media with different roles belong to different adaptation sets.
* :desc_p=VALUE: add a descriptor at the Period level.
* :desc_as=VALUE: add a descriptor at the AdaptationSet level. Two input files with different values will be in different AdaptationSet elements.
* :desc_as_c=VALUE: add a descriptor at the AdaptationSet level. Value is ignored while creating AdaptationSet elements.
* :desc_rep=VALUE: add a descriptor at the Representation level. Value is ignored while creating AdaptationSet elements.
* :sscale: force movie timescale to match media timescale of the first track in the segment.
* :trackID=N: only use the track ID N from the source file
* @f1[:args][@fN:args][@@fK:args]: set a filter chain to insert between the source and the dasher. Each filter in the chain is formatted as a regular filter, see filter doc `gpac -h doc`. If several filters are set:
 - they will be chained in the given order if separated by a single @
 - a new filter chain will be created if separated by a double @@. In this case, no representation ID is assigned to the source.
Example
source.mp4:@c=avc:b=1M@@c=avc:b=500k

This will load a filter chain with two encoders connected to the source and to the dasher.
Example
source.mp4:@c=avc:b=1M@c=avc:b=500k

This will load a filter chain with the second encoder connected to the output of the first (!!).

Note: @f must be placed after all other options.

Note: Descriptors value must be a properly formatted XML element(s), value is not checked. Syntax can use file@FILENAME to load content from file.

-dash (number)

create DASH from input files with given segment (subsegment for onDemand profile) duration in ms

-dash-live (number)

generate a live DASH session using the given segment duration in ms; using -dash-live=F will also write the live context to F. MP4Box will run the live session until q is pressed or a fatal error occurs

-ddbg-live (number)

same as .I dash-live without time regulation for debug purposes

-frag (number)

specify the fragment duration in ms. If not set, this is the DASH duration (one fragment per segment)

-out (string)

specify the output MPD file name

-profile,-dash-profile (string)

specify the target DASH profile, and set default options to ensure conformance to the desired profile. Default profile is full in static mode, live in dynamic mode (old syntax using :live instead of .live as separator still possible). Defined values are onDemand, live, main, simple, full, hbbtv1.5.live, dashavc264.live, dashavc264.onDemand, dashif.ll

-profile-ext (string)

specify a list of profile extensions, as used by DASH-IF and DVB. The string will be colon-concatenated with the profile used

-rap

ensure that segments begin with random access points, segment durations might vary depending on the source encoding

-frag-rap

ensure that all fragments begin with random access points (duration might vary depending on the source encoding)

-segment-name (string)

set the segment name for generated segments. If not set (default), segments are concatenated in output file except in live profile where dash_%%s. Supported replacement strings are:
- $Number[%%0Nd]$ is replaced by the segment number, possibly prefixed with 0
- $RepresentationID$ is replaced by representation name
- $Time$ is replaced by segment start time
- $Bandwidth$ is replaced by representation bandwidth
- $Init=NAME$ is replaced by NAME for init segment, ignored otherwise
- $Index=NAME$ is replaced by NAME for index segments, ignored otherwise
- $Path=PATH$ is replaced by PATH when creating segments, ignored otherwise
- $Segment=NAME$ is replaced by NAME for media segments, ignored for init segments

-segment-ext (string, default: m4s)

set the segment extension, null means no extension

-init-segment-ext (string, default: mp4)

set the segment extension for init, index and bitstream switching segments, null means no extension

-segment-timeline

use SegmentTimeline when generating segments

-segment-marker (string)

add a box of given type (4CC) at the end of each DASH segment

-insert-utc

insert UTC clock at the beginning of each ISOBMF segment

-base-url (string)

set Base url at MPD level. Can be used several times.  
Warning: this does not  modify generated files location

-mpd-title (string)

set MPD title

-mpd-source (string)

set MPD source

-mpd-info-url (string)

set MPD info url

-cprt (string)

add copyright string to MPD

-dash-ctx (string)

store/restore DASH timing from indicated file

-dynamic

use dynamic MPD type instead of static

-last-dynamic

same as .I dynamic but close the period (insert lmsg brand if needed and update duration)

-mpd-duration (number)

set the duration in second of a live session (if 0, you must use .I mpd-refresh)

-mpd-refresh (number)

specify MPD update time in seconds

-time-shift (int)

specify MPD time shift buffer depth in seconds, -1 to keep all files)

-subdur (number)

specify maximum duration in ms of the input file to be dashed in LIVE or context mode. This does not change the segment duration, but stops dashing once segments produced exceeded the duration. If there is not enough samples to finish a segment, data is looped unless .I no-loop is used which triggers a period end

-run-for (int)

run for given ms  the dash-live session then exits

-min-buffer (int)

specify MPD min buffer time in ms

-ast-offset (int)

specify MPD AvailabilityStartTime offset in ms if positive, or availabilityTimeOffset of each representation if negative

-dash-scale (int)

specify that timing for .I dash,  .I dash-live, .I subdur and .I do_frag are expressed in given timescale (units per seconds) rather than ms

-mem-frags

fragmentation happens in memory rather than on disk before flushing to disk

-pssh (int)

set pssh store mode
* v: initial movie
* f: movie fragments
* m: MPD
* mv, vm: in initial movie and MPD
* mf, fm: in movie fragments and MPD
* n: remove PSSH from MPD, initial movie and movie fragments

-sample-groups-traf

store sample group descriptions in traf (duplicated for each traf). If not set, sample group descriptions are stored in the initial movie

-mvex-after-traks

store mvex box after trak boxes within the moov box. If not set, mvex is before

-sdtp-traf (int)

use sdtp box in traf (Smooth-like)
* no: do not use sdtp
* sdtp: use sdtp box to indicate sample dependencies and do not write info in trun sample flags
* both: use sdtp box to indicate sample dependencies and also write info in trun sample flags

-no-cache

disable file cache for dash inputs

-no-loop

disable looping content in live mode and uses period switch instead

-hlsc

insert UTC in variant playlists for live HLS

-bound

segmentation will always try to split before or at, but never after, the segment boundary

-closest

segmentation will use the closest frame to the segment boundary (before or after)

-subsegs-per-sidx,-frags-per-sidx (int)

set the number of subsegments to be written in each SIDX box
* 0: a single SIDX box is used per segment
* -1: no SIDX box is used

-ssix

enable SubsegmentIndexBox describing 2 ranges, first one from moof to end of first I-frame, second one unmapped. This does not work with daisy chaining mode enabled

-url-template

use SegmentTemplate instead of explicit sources in segments. Ignored if segments are stored in the output file

-url-template-sim

use SegmentTemplate simulation while converting HLS to MPD

-daisy-chain

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

-single-segment

use a single segment for the whole file (OnDemand profile)

-single-file

use a single file for the whole file (default)

-bs-switching (string, default: inband, values: inband|merge|multi|no|single)

set bitstream switching mode
* inband: use inband param set and a single init segment
* merge: try to merge param sets in a single sample description, fallback to no
* multi: use several sample description, one per quality
* no: use one init segment per quality
* pps: use out of band VPS,SPS,DCI, inband for PPS,APS and a single init segment
* single: to test with single input

-moof-sn (int)

set sequence number of first moof to given value

-tfdt (int)

set TFDT of first traf to given value in SCALE units (cf -dash-scale)

-no-frags-default

disable default fragments flags in trex (required by some dash-if profiles and CMAF/smooth streaming compatibility)

-single-traf

use a single track fragment per moof (smooth streaming and derived specs may require this)

-tfdt-traf

use a tfdt per track fragment (when -single-traf is used)

-dash-ts-prog (int)

program_number to be considered in case of an MPTS input file

-frag-rt

when using fragments in live mode, flush fragments according to their timing

-cp-location (string)

set ContentProtection element location
* as: sets ContentProtection in AdaptationSet element
* rep: sets ContentProtection in Representation element
* both: sets ContentProtection in both elements

-start-date (string)

for live mode, set start date (as xs:date, e.g. YYYY-MM-DDTHH:MM:SSZ). Default is current UTC
Warning: Do not use with multiple periods, nor when DASH duration is not a multiple of GOP size

-cues (string)

ignore dash duration and segment according to cue times in given XML file (tests/media/dash_cues for examples)

-strict-cues

throw error if something is wrong while parsing cues or applying cue-based segmentation

-merge-last-seg

merge last segment if shorter than half the target duration
 

MP4Box can split input files by size, duration or extract a given part of the file to new IsoMedia file(s).
This requires that at most one track in the input file has non random-access points (typically one video track at most).
Splitting will ignore all MPEG-4 Systems tracks and hint tracks, but will try to split private media tracks.
The input file must have enough random access points in order to be split. If this is not the case, you will have to re-encode the content.
You can add media to a file and split it in the same pass. In this case, the destination file (the one which would be obtained without splitting) will not be stored.
 
Time ranges are specified as follows:
* `S-E`: S start and E end times, formatted as HH:MM:SS.ms, MM:SS.ms or time in seconds (int, double, fraction)
* `S:E`: S start time and E end times in seconds (int, double, fraction). If E is prefixed with D, this sets E = S + time
* `S:end` or `S:end-N`: S start time in seconds (int, double), N number of seconds (int, double) before the end
 
MP4Box splitting runs a filter session using the reframer filter as follows:
- splitrange option of the reframer is always set
- source is demultiplexed with alltk option set
- start and end ranges are passed to xs and xe options of the reframer
- for -splitz, options xadjust and xround=after are enforced
- for -splitg, options xadjust and xround=before are enforced
- for -splitf, option xround=seek is enforced and propbe_refset if not specified at prompt
- for -splitx, option xround=closest and propbe_ref are enforced if not specified at prompt
 
The default output storage mode is to full interleave and will require a temp file for each output. This behavior can be modified using -flat, -newfs, -inter and -frag.
The output file name(s) can be specified using -out and templates (e.g. -out split$num%04d$.mp4 produces split0001.mp4, split0002.mp4, ...).
Multiple time ranges can be specified as a comma-separated list for -splitx, -splitz and -splitg.
 

-split (string)

split in files of given max duration (float number) in seconds. A trailing unit can be specified:
* `M`, `m`: duration is in minutes
* `H`, `h`: size is in hours

-split-rap,-splitr (string)

split in files at each new RAP

-split-size,-splits (string)

split in files of given max size (integer number) in kilobytes. A trailing unit can be specified:
* `M`, `m`: size is in megabytes
* `G`, `g`: size is in gigabytes

-split-chunk,-splitx (string)

extract the specified time range as follows:
- the start time is moved to the RAP sample closest to the specified start time
- the end time is kept as requested

-splitz (string)

extract the specified time range so that ranges A:B and B:C share exactly the same boundary B:
- the start time is moved to the RAP sample at or after the specified start time
- the end time is moved to the frame preceding the RAP sample at or following the specified end time

-splitg (string)

extract the specified time range as follows:
- the start time is moved to the RAP sample at or before the specified start time
- the end time is moved to the frame preceding the RAP sample at or following the specified end time

-splitf (string)

extract the specified time range and insert edits such that the extracted output is exactly the specified range

 
MP4Box has many dump functionalities, from simple track listing to more complete reporting of special tracks.
 
Options:

-std

dump/write to stdout and assume stdout is opened in binary mode

-stdb

dump/write to stdout and try to reopen stdout in binary mode

-tracks

print the number of tracks on stdout

-info (string)

print movie info (no parameter) or track extended info with specified ID

-infon (string)

print track info for given track number, 1 being the first track in the file

-infox

print movie and track extended info (same as -info N for each track)

-diso,-dmp4

dump IsoMedia file boxes in XML output

-dxml

dump IsoMedia file boxes and known track samples in XML output

-disox

dump IsoMedia file boxes except sample tables in XML output

-keep-ods

do not translate ISOM ODs and ESDs tags (debug purpose only)

-bt

dump scene to BT format

-xmt

dump scene to XMT format

-wrl

dump scene to VRML format

-x3d

dump scene to X3D XML format

-x3dv

dump scene to X3D VRML format

-lsr

dump scene to LASeR XML (XSR) format

-svg

dump scene to SVG

-drtp

dump rtp hint samples structure to XML output

-dts

print sample timing, size and position in file to text output

-dtsx

same as .I dts but does not print offset

-dtsc

same as .I dts but analyses each sample for duplicated dts/cts (slow !)

-dtsxc

same as .I dtsc but does not print offset (slow !)

-dnal (int)

print NAL sample info of given track

-dnalc (int)

print NAL sample info of given track, adding CRC for each nal

-dnald (int)

print NAL sample info of given track without DTS and CTS info

-dnalx (int)

print NAL sample info of given track without DTS and CTS info and adding CRC for each nal

-sdp

dump SDP description of hinted file

-dsap (int)

dump DASH SAP cues (see -cues) for a given track

-dsaps (int)

same as .I dsap but only print sample number

-dsapc (int)

same as .I dsap but only print CTS

-dsapd (int)

same as .I dsap but only print DTS

-dsapp (int)

same as .I dsap but only print presentation time

-dcr

dump ISMACryp samples structure to XML output

-dchunk

dump chunk info

-dump-cover

extract cover art

-dump-chap

extract chapter file as TTXT format

-dump-chap-ogg

extract chapter file as OGG format

-dump-chap-zoom

extract chapter file as zoom format

-dump-udta [tkID:]4cc

extract user data for the given 4CC. If tkID is given, dumps from UDTA of the given track ID, otherwise moov is used

-mergevtt

merge vtt cues while dumping

-ttxt (int)

convert input subtitle to GPAC TTXT format if no parameter. Otherwise, dump given text track to GPAC TTXT format

-srt (int)

convert input subtitle to SRT format if no parameter. Otherwise, dump given text track to SRT format

-nstat

generate node/field statistics for scene

-nstats

generate node/field statistics per Access Unit

-nstatx

generate node/field statistics for scene after each AU

-hash

generate SHA-1 Hash of the input file

-comp (string)

replace with compressed version all top level box types given as parameter, formatted as orig_4cc_1=comp_4cc_1[,orig_4cc_2=comp_4cc_2]

-topcount (string)

print to stdout the number of top-level boxes matching box types given as parameter, formatted as 4cc_1,4cc_2N

-topsize (string)

print to stdout the number of bytes of top-level boxes matching types given as parameter, formatted as 4cc_1,4cc_2N or all for all boxes

-bin

convert input XML file using NHML bitstream syntax to binary

-mpd-rip

fetch MPD and segment to disk

-udp-write (string, default: IP[:port])

write input name to UDP (default port 2345)

-raw-cat (string)

raw concatenation of given file with input file

-wget (string)

fetch resource from http(s) URL

-dm2ts

dump timing of an input MPEG-2 TS stream sample timing

-check-xml

check XML output format for -dnal*, -diso* and -dxml options

-fuzz-chk

open file without probing and exit (for fuzz tests)

Syntax is .I add / .I cat URL[#FRAGMENT][:opt1...:optN=val]
This process will create the destination file if not existing, and add the track(s) to it. If you wish to always create a new destination file, add .I -new.
The supported input media types depend on your installation, check filters documentation for more info.
 
To select a desired media track from a source, a fragment identifier '#' can be specified, before any other options. The following syntax is used:
* `#video`: adds the first video track found in source
* `#audio`: adds the first audio track found in source
* `#auxv`: adds the first auxiliary video track found in source
* `#pict`: adds the first picture track found in source
* `#trackID=ID` or `#ID`: adds the specified track. For IsoMedia files, ID is the track ID. For other media files, ID is the value indicated by MP4Box -info inputFile
* `#pid=ID`: number of desired PID for MPEG-2 TS sources
* `#prog_id=ID`: number of desired program for MPEG-2 TS sources
* `#program=NAME`: name of desired program for MPEG-2 TS sources
 
By default all imports are performed sequentially, and final interleaving is done at the end; this however requires a temporary file holding original ISOBMF file (if any) and added files before creating the final output. Since this can become quite large, it is possible to add media to a new file without temporary storage, using .I -flat option, but this disables media interleaving.
 
If you wish to create an interleaved new file with no temporary storage, use the .I -newfs option. The interleaving might not be as precise as when using .I new since it is dependent on multiplexer input scheduling (each execution might lead to a slightly different result). Additionally in this mode:
- Some multiplexing options (marked with X below) will be activated for all inputs (e.g. it is not possible to import one AVC track with xps_inband and another without).
- Some multiplexing options (marked as D below) cannot be used as they require temporary storage for file edition.
- Usage of .I cat is possible, but concatenated sources will not be interleaved in the output. If you wish to perform more complex cat/add operations without temp file, use a playlist.
 
Source URL can be any URL supported by GPAC, not limited to local files.
 
Note: When importing SRT or SUB files, MP4Box will choose default layout options to make the subtitle appear at the bottom of the video. You SHOULD NOT import such files before any video track is added to the destination file, otherwise the results will likely not be useful (default SRT/SUB importing uses default serif font, fontSize 18 and display size 400x60). For more details, check TTXT doc.
 
When importing several tracks/sources in one pass, all options will be applied if relevant to each source. These options are set for all imported streams. If you need to specify these options per stream, set per-file options using the syntax -add stream[:opt1:...:optN].
 
The import file name may be set to empty or self, indicating that the import options should be applied to the destination file track(s).
Example
-add self:moovts=-1:noedit src.mp4

This will apply moovts and noedit option to all tracks in src.mp4
Example
-add self#2:moovts=-1:noedit src.mp4

This will apply moovts and noedit option to track with ID=2 in src.mp4
Only per-file options marked with a S are possible in this mode.
 
When importing an ISOBMFF/QT file, only options marked as C or S can be used.
 
Allowed per-file options:

dur (int)

XC import only the specified duration from the media. Value can be:
 * positive float: specifies duration in seconds
 * fraction: specifies duration as NUM/DEN fraction
 * negative integer: specifies duration in number of coded frames

start (number)

C target start time in source media, may not be supported depending on the source

lang (string)

S set imported media language code

delay (int)

S set imported media initial delay (>0) or initial skip (<0) in ms or as fractional seconds (N/D)

par (string)

S set visual pixel aspect ratio (see .I -par )

clap (string)

S set visual clean aperture (see .I -clap )

mx (string)

S set track matrix (see .I -mx )

name (string)

S set track handler name

ext (string)

override file extension when importing

hdlr (string)

S set track handler type to the given code point (4CC)

stype (string)

S force sample description type to given code point (4CC), may likely break the file

tkhd (int)

S set track header flags has hex integer or as comma-separated list of enable, movie, preview, size_ar keywords (use tkhd+=FLAGS to add and tkhd-=FLAGS to remove)

disable

S disable imported track(s), use disable=no to force enabling a disabled track

group (int)

S add the track as part of the G alternate group. If G is 0, the first available GroupID will be picked

fps (string)

S same as .I fps

rap

DS import only RAP samples

refs

DS import only reference pictures

trailing

keep trailing 0-bytes in AVC/HEVC samples

agg (int)

X same as .I agg

dref

XC same as .I dref

keep_refs

C keep track reference when importing a single track

nodrop

same as .I nodrop

packed

X same as .I packed

sbr

same as .I sbr

sbrx

same as .I sbrx

ovsbr

same as .I ovsbr

ps

same as .I ps

psx

same as .I psx

asemode (string)

XS set the mode to create the AudioSampleEntry. Value can be:
 * v0-bs: use MPEG AudioSampleEntry v0 and the channel count from the bitstream (even if greater than 2) - default
 * v0-2: use MPEG AudioSampleEntry v0 and the channel count is forced to 2
 * v1: use MPEG AudioSampleEntry v1 and the channel count from the bitstream
 * v1-qt: use QuickTime Sound Sample Description Version 1 and the channel count from the bitstream (even if greater than 2). This will also trigger using alis data references instead of url, even for non-audio tracks

audio_roll (int)

S add a roll sample group with roll_distance N for audio tracks

roll (int)

S add a roll sample group with roll_distance N

proll (int)

S add a preroll sample group with roll_distance N

mpeg4

X same as .I mpeg4 option

nosei

discard all SEI messages during import

svc

import SVC/LHVC with explicit signaling (no AVC base compatibility)

nosvc

discard SVC/LHVC data when importing

svcmode (string)

DS set SVC/LHVC import mode. Value can be:
 * split: each layer is in its own track
 * merge: all layers are merged in a single track
 * splitbase: all layers are merged in a track, and the AVC base in another
 * splitnox: each layer is in its own track, and no extractors are written
 * splitnoxib: each layer is in its own track, no extractors are written, using inband param set signaling

temporal (string)

DS set HEVC/LHVC temporal sublayer import mode. Value can be:
 * split: each sublayer is in its own track
 * splitbase: all sublayers are merged in a track, and the HEVC base in another
 * splitnox: each layer is in its own track, and no extractors are written

subsamples

add SubSample information for AVC+SVC

deps

import sample dependency information for AVC and HEVC

ccst

S add default HEIF ccst box to visual sample entry

forcesync

force non IDR samples with I slices (OpenGOP or GDR) to be marked as sync points
Warning: RESULTING FILE IS NOT COMPLIANT WITH THE SPEC but will fix seeking in most players

xps_inband

XC set xPS inband for AVC/H264 and HEVC (for reverse operation, re-import from raw media)

xps_inbandx

XC same as xps_inband and also keep first xPS in sample description

au_delim

keep AU delimiter NAL units in the imported file

max_lid (int)

set HEVC max layer ID to be imported to N (by default imports all layers)

max_tid (int)

set HEVC max temporal ID to be imported to N (by default imports all temporal sublayers)

tiles

S add HEVC tiles signaling and NALU maps without splitting the tiles into different tile tracks

split_tiles

DS split HEVC tiles into different tile tracks, one tile (or all tiles of one slice) per track

negctts

S use negative CTS-DTS offsets (ISO4 brand). Use negctts=no to force using positive offset on existing track

chap

S specify the track is a chapter track

chapter (string)

S add a single chapter (old nero format) with given name lasting the entire file

chapfile (string)

S add a chapter file (old nero format)

layout (string)

S specify the track layout as WxH[xXxY][xLAYER]. If W (resp H) is 0, the max width (resp height) of the tracks in the file are used

rescale (int)

S force media timescale to TS  (int or fraction) and change the media duration

sampdur (int)

S force all samples duration (D) or sample durations and media timescale (D/TS), used to patch CFR files with broken timings

timescale (int)

S set imported media timescale to TS

moovts (int)

S set movie timescale to TS. A negative value picks the media timescale of the first track imported

noedit

XS do not set edit list when importing B-frames video tracks

rvc (string)

S set RVC configuration for the media

fmt (string)

override format detection with given format - disable data probing and force ext option on source

profile (int)

S override AVC profile. Integer value, or high444, high, extended, main, baseline

level (int)

S override AVC level, if value < 6, interpreted as decimal expression

compat (int)

S force the profile compatibility flags for the H.264 content

novpsext

remove VPS extensions from HEVC VPS

keepav1t

keep AV1 temporal delimiter OBU in samples, might help if source file had losses

dlba (string)

S force DolbyAtmos mode for EAC3. Value can be
* no: disable Atmos signaling
* auto: use Atmos signaling from first sample
* N: force Atmos signaling using compatibility type index N

font (string)

specify font name for text import (default Serif)

size (int)

specify font size for text import (default 18)

text_layout (string)

specify the track text layout as WxHxXxY
 * if W (resp H) = 0: the max width (resp height) of the tracks in the file are used
 * if Y=-1: the layout is moved to the bottom of the track area
 * X and Y can be omitted: :layout=WxH

swf-global

all SWF defines are placed in first scene replace rather than when needed

swf-no-ctrl

use a single stream for movie control and dictionary (this will disable ActionScript)

swf-no-text

remove all SWF text

swf-no-font

remove all embedded SWF Fonts (local playback host fonts used)

swf-no-line

remove all lines from SWF shapes

swf-no-grad

remove all gradients from SWF shapes

swf-quad

use quadratic bezier curves instead of cubic ones

swf-xlp

support for lines transparency and scalability

swf-ic2d

use indexed curve 2D hardcoded proto

swf-same-app

appearance nodes are reused

swf-flatten (number)

complementary angle below which 2 lines are merged, 0 means no flattening

kind (string)

S set kind for the track as schemeURI=value

txtflags (int)

set display flags (hexa number) of text track. Use txtflags+=FLAGS to add flags and txtflags-=FLAGS to remove flags

rate (int)

force average rate and max rate to VAL (in bps) in btrt box. If 0, removes btrt box

stz2

S use compact size table (for low-bitrates)

bitdepth (int)

set bit depth to VAL for imported video content (default is 24)

colr (string)

S set color profile for imported video content. Value is formatted as:
 * nclc,p,t,m: with p colour primary (int or string), t transfer characteristics (int or string) and m matrix coef (int or string), cf -h cicp
 * nclx,p,t,m,r: same as nclx with r full range flag (yes, on or no, off)
 * prof,path: with path indicating the file containing the ICC color profile
 * rICC,path: with path indicating the file containing the restricted ICC color profile
 * 'none': removes color info

hdr (string)

S set HDR info on track (see .I -hdr ), 'none' removes HDR info

dvp,-dv-profile (string)

S set the Dolby Vision profile on imported track
- Profile is an integer, or none to remove DV signaling
- Profile can be suffixed with compatibility ID, e.g. 5.hdr10
- Allowed compatibility ID are none, hdr10, bt709, hlg709, hlg2100, bt2020, brd, or integer value as per DV spec
- Profile can be prefixed with 'f' to force DV codec type signaling, e.g. f8.2

fullrange (string)

S force the video fullrange type in VUI for the AVC|H264 content (value yes, on or no, off)

videofmt (string)

S force the video format in VUI for AVC|H264 and HEVC content, value can be component, pal, ntsc, secam, mac, undef

colorprim (string)

S force the colour primaries in VUI for AVC|H264 and HEVC (int or string, cf -h cicp)

colortfc (string)

S force transfer characteristics in VUI for AVC|H264 and HEVC (int or string, cf -h cicp)

colormx (string)

S force the matrix coefficients in VUI for the AVC|H264 and HEVC content (int or string, cf -h cicp)

tc (string)

S inject a single QT timecode. Value is formatted as:
 * [d]FPS[/FPS_den],h,m,s,f[,framespertick]: optional drop flag, framerate (integer or fractional), hours, minutes, seconds and frame number
 * : d is an optional flag used to indicate that the counter is in drop-frame format
 * : the framespertick is optional and defaults to round(framerate); it indicates the number of frames per counter tick

edits (string)

S override edit list, same syntax as .I edits

lastsampdur (string)

S set duration of the last sample. Value is formatted as:
 * no value: use the previous sample duration
 * integer: indicate the duration in milliseconds
 * N/D: indicate the duration as fractional second

ID (int)

S set target ID
 - a value of 0 (default) will try to keep source track ID
 - a value of -1 will ignore source track ID
 - other value will try to set track ID to this value if no other track with same ID is present

tkgp (string)

S assign track group to track. Value is formatted as TYPE,N with TYPE the track group type (4CC) and N the track group ID. A negative ID removes from track group ID -N

tkidx (string)

S set track position in track list, 1 being first track in file

stats,-fstat

C print filter session stats after import

graph,-fgraph

C print filter session graph after import

sopt:[OPTS]

set OPTS as additional arguments to source filter. OPTS can be any usual filter argument, see filter doc `gpac -h doc`

dopt:[OPTS]

X set OPTS as additional arguments to destination filter. OPTS can be any usual filter argument, see filter doc `gpac -h doc`

@f1[:args][@fN:args]

set a filter chain to insert before the multiplexer. Each filter in the chain is formatted as a regular filter, see filter doc `gpac -h doc`. A @@ separator starts a new chain (see DASH help). The last filter in each chain shall not have any ID specified

Note: sopt, dopt and @f must be placed after all other options.

-add (string)

add given file tracks to file. Multiple inputs can be specified using +, e.g. -add url1+url2

-cat (string)

concatenate given file samples to file, creating tracks if needed. Multiple inputs can be specified using +, e.g/ -cat url1+url2.  
Note: This aligns initial timestamp of the file to be concatenated

-catx (string)

same as .I cat but new tracks can be imported before concatenation by specifying +ADD_COMMAND where ADD_COMMAND is a regular .I add syntax

-catpl (string)

concatenate files listed in the given playlist file (one file per line, lines starting with # are comments).  
Note: Each listed file is concatenated as if called with -cat

-unalign-cat

do not attempt to align timestamps of samples in-between tracks

-force-cat

skip media configuration check when concatenating file.  
Warning: THIS MAY BREAK THE CONCATENATED TRACK(S)

-keep-sys

keep all MPEG-4 Systems info when using .I add and .I cat (only used when adding IsoMedia files)

-dref

keep media data in original file using data referencing. The resulting file only contains the meta-data of the presentation (frame sizes, timing, etc...) and references media data in the original file. This is extremely useful when developing content, since importing and storage of the MP4 file is much faster and the resulting file much smaller.  
Note: Data referencing may fail on some files because it requires the framed data (e.g. an IsoMedia sample) to be continuous in the original file, which is not always the case depending on the original interleaving or bitstream format (AVC or HEVC cannot use this option)

-no-drop,-nodrop

force constant FPS when importing AVI video

-packed

force packed bitstream when importing raw MPEG-4 part 2 Advanced Simple Profile

-sbr

backward compatible signaling of AAC-SBR

-sbrx

non-backward compatible signaling of AAC-SBR

-ps

backward compatible signaling of AAC-PS

-psx

non-backward compatible signaling of AAC-PS

-ovsbr

oversample SBR import (SBR AAC, PS AAC and oversampled SBR cannot be detected at import time)

-fps (string)

force frame rate for video and SUB subtitles import to the given value, expressed as a number, as TS-inc or TS/inc.  
Note: For raw H263 import, default FPS is 15, otherwise 25. This is accepted for ISOBMFF import but :rescale option should be preferred

-mpeg4

force MPEG-4 sample descriptions when possible. For AAC, forces MPEG-4 AAC signaling even if MPEG-2

-agg (int)

aggregate N audio frames in 1 sample (3GP media only, maximum value is 15)

IsoMedia hinting consists in creating special tracks in the file that contain transport protocol specific information and optionally multiplexing information. These tracks are then used by the server to create the actual packets being sent over the network, in other words they provide the server with hints on how to build packets, hence their names hint tracks.
MP4Box supports creation of hint tracks for RTSP servers supporting these such as QuickTime Streaming Server, DarwinStreaming Server or 3GPP-compliant RTSP servers.
Note: GPAC streaming tools rtp output and rtsp server do not use hint tracks, they use on-the-fly packetization from any media sources, not just MP4
 
Options:

-hint

hint the file for RTP/RTSP

-mtu (int, default: 1450)

specify RTP MTU (max size) in bytes (this includes 12 bytes RTP header)

-copy

copy media data to hint track rather than reference (speeds up server but takes much more space)

-multi [maxptime]

enable frame concatenation in RTP packets if possible (with max duration 100 ms or maxptime ms if given)

-rate (int, default: 90000)

specify rtp rate in Hz when no default for payload

-mpeg4

force MPEG-4 generic payload whenever possible

-latm

force MPG4-LATM transport for AAC streams

-static

enable static RTP payload IDs whenever possible (by default, dynamic payloads are always used)

-add-sdp (string)

add given SDP string to movie (string) or track (tkID:string), tkID being the track ID or the hint track ID

-no-offset

signal no random offset for sequence number and timestamp (support will depend on server)

-unhint

remove all hinting information from file

-group-single

put all tracks in a single hint group

-ocr

force all MPEG-4 streams to be synchronized (MPEG-4 Systems only)

-rap

signal random access points in RTP packets (MPEG-4 Systems)

-ts

signal AU Time Stamps in RTP packets (MPEG-4 Systems)

-size

signal AU size in RTP packets (MPEG-4 Systems)

-idx

signal AU sequence numbers in RTP packets (MPEG-4 Systems)

-iod

prevent systems tracks embedding in IOD (MPEG-4 Systems), not compatible with .I isma

MP4Box supports encryption and decryption of ISMA, OMA and CENC content, see encryption filter `gpac -h cecrypt`.
It requires a specific XML file called CryptFile, whose syntax is available at https://wiki.gpac.io/Common-Encryption
Image files (HEIF) can also be crypted / decrypted, using CENC only.
 
Options:

-crypt (string)

encrypt the input file using the given CryptFile

-decrypt (string)

decrypt the input file, potentially using the given CryptFile. If CryptFile is not given, will fail if the key management system is not supported

-set-kms tkID=kms_uri

change ISMA/OMA KMS location for a given track or for all tracks if all= is used

IsoMedia files can be used as generic meta-data containers, for examples storing XML information and sample images for a movie. The resulting file may not always contain a movie as is the case with some HEIF files or MPEG-21 files.
 
These information can be stored at the file root level, as is the case for HEIF/IFF and MPEG-21 file formats, or at the movie or track level for a regular movie.  
 

-set-meta ABCD[:tk=tkID]

set meta box type, with ABCD the four char meta type (NULL or 0 to remove meta)
* tk not set: use root (file) meta
* tkID == 0: use moov meta
* tkID != 0: use meta of given track

-add-item (string)

add resource to meta, with parameter syntax file_path[:opt1:optN]
* file_path `this` or `self`: item is the file itself
* tk=tkID: meta location (file, moov, track)
* name=str: item name, none if not set
* type=itype: item 4cc type (not needed if mime is provided)
* mime=mtype: item mime type, none if not set
* encoding=enctype: item content-encoding type, none if not set
* id=ID: item ID
* ref=4cc,id: reference of type 4cc to an other item (can be set multiple times)
* group=id,type: indicate the id and type of an alternate group for this item
* replace: replace existing item by new item

-add-image (string)

add the given file as HEIF image item, with parameter syntax file_path[:opt1:optN]. If filepath is omitted, source is the input MP4 file
* name, id, ref: see .I add-item
* primary: indicate that this item should be the primary item
* time=t[-e][/i]: use the next sync sample after time t (float, in sec, default 0). A negative time imports ALL intra frames as items
- If e is set (float, in sec), import all sync samples between t and e
- If i is set (float, in sec), sets time increment between samples to import
* split_tiles: for an HEVC tiled image, each tile is stored as a separate item
* image-size=wxh: force setting the image size and ignoring the bitstream info, used for grid, overlay and identity derived images also
* rotation=a: set the rotation angle for this image to 90*a degrees anti-clockwise
* mirror-axis=axis: set the mirror axis: vertical, horizontal
* clap=Wn,Wd,Hn,Hd,HOn,HOd,VOn,VOd: see track clap
* image-pasp=axb: force the aspect ratio of the image
* image-pixi=(a|a,b,c): force the bit depth (1 or 3 channels)
* hidden: indicate that this image item should be hidden
* icc_path: path to icc data to add as color info
* alpha: indicate that the image is an alpha image (should use ref=auxl also)
* depth: indicate that the image is a depth image (should use ref=auxl also)
* it=ID: indicate the item ID of the source item to import
* itp=ID: same as it= but copy over all properties of the source item
* tk=tkID: indicate the track ID of the source sample. If 0, uses the first video track in the file
* samp=N: indicate the sample number of the source sample
* ref: do not copy the data but refer to the final sample/item location, ignored if filepath is set
* agrid[=AR]: creates an automatic grid from the image items present in the file, in their declaration order. The grid will try to have AR aspect ratio if specified (float), or the aspect ratio of the source otherwise. The grid will be the primary item and all other images will be hidden
* av1_op_index: select the AV1 operating point to use via a1op box
* replace: replace existing image by new image, keeping props listed in keep_props
* keep_props=4CCs: coma-separated list of properties types to keep when replacing the image, e.g. keep_props=auxC
* auxt=URN: mark image as auxiliary using given URN
* auxd=FILE: use data from FILE as auxiliary extensions (cf auxC box)
- any other options will be passed as options to the media importer, see .I add

-add-derived-image (string)

create an image grid, overlay or identity item, with parameter syntax :type=(grid|iovl|iden)[:opt1:optN]
* image-grid-size=rxc: set the number of rows and columns of the grid
* image-overlay-offsets=h,v[,h,v]*: set the horizontal and vertical offsets of the images in the overlay
* image-overlay-color=r,g,b,a: set the canvas color of the overlay [0-65535]
- any other options from .I add-image can be used

-rem-item,-rem-image item_ID[:tk=tkID]

remove resource from meta

-set-primary item_ID[:tk=tkID]

set item as primary for meta

-set-xml xml_file_path[:tk=tkID][:binary]

set meta XML data

-rem-xml [tk=tkID]

remove meta XML data

-dump-xml file_path[:tk=tkID]

dump meta XML to file

-dump-item item_ID[:tk=tkID][:path=fileName]

dump item to file

-package (string)

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

-mgt (string)

package input XML file into an MPEG-U widget with ISO container, all files contained in the current folder are added to the widget package

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

-global

all SWF defines are placed in first scene replace rather than when needed

-no-ctrl

use a single stream for movie control and dictionary (this will disable ActionScript)

-no-text

remove all SWF text

-no-font

remove all embedded SWF Fonts (local playback host fonts used)

-no-line

remove all lines from SWF shapes

-no-grad

remove all gradients from swf shapes

-quad

use quadratic bezier curves instead of cubic ones

-xlp

support for lines transparency and scalability

-ic2d

use indexed curve 2D hardcoded proto

-same-app

appearance nodes are reused

-flatten (number)

complementary angle below which 2 lines are merged, value 0 means no flattening

Tags are specified as a colon-separated list tag_name=tag_value[:tag2=val2]
Setting a tag with no value or value NULL removes the tag.
Special tag value clear (or reset) removes all tags.
Unsupported tags can be added using their four character code as a tag name, and string value will be assumed.
If the tag name length is 3, the prefix 0xA9 is used to create the four character code.
 
Tags can also be loaded from a text file using -itags filename. The file must be in UTF8 with:
- lines starting with tag_name=value specify the start of a tag
- other lines specify the remainder of the last declared tag
 
If tag name starts with WM/, the tag is added to Xtra box (WMA tag, string only).
 

The options shall be specified as opt_name=opt_val.
Options:

-live

enable live BIFS/LASeR encoder

-dst (string)

destination IP

-port (int, default: 7000)

destination port

-mtu (int, default: 1450)

path MTU for RTP packets

-ifce (string)

IP address of the physical interface to use

-ttl (int, default: 1)

time to live for multicast packets

-sdp (string, default: session.sdp)

output SDP file

-dims

turn on DIMS mode for SVG input

-no-rap

disable RAP sending and carousel generation

-src (string)

source of scene updates

-rap (int)

duration in ms of base carousel; you can specify the RAP period of a single ESID (not in DIMS) using ESID=X:time
 
Runtime options:
* 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

Basic and advanced examples are available at https://wiki.gpac.io/MP4Box

Authors: GPAC developers, see git repo history (-log)
For bug reports, feature requests, more information and source code, visit https://github.com/gpac/gpac
build: 2.4
Copyright: (c) 2000-2023 Telecom Paris distributed under LGPL v2.1+ - https://gpac.io

gpac(1)

h264enc(1).