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Properties
| GstQTMuxDtsMethods | dts-method | Read / Write / Construct |
| gboolean | faststart | Read / Write |
| gchar * | faststart-file | Read / Write / Construct |
| guint | fragment-duration | Read / Write / Construct |
| gchar * | moov-recovery-file | Read / Write / Construct |
| guint | movie-timescale | Read / Write / Construct |
| gboolean | presentation-time | Read / Write / Construct |
| gboolean | streamable | Read / Write / Construct |
| guint | trak-timescale | Read / Write / Construct |
| guint | reserved-bytes-per-sec | Read / Write / Construct |
| guint64 | reserved-duration-remaining | Read |
| guint64 | reserved-max-duration | Read / Write |
| guint64 | reserved-moov-update-period | Read / Write |
| guint64 | interleave-bytes | Read / Write |
| guint64 | interleave-time | Read / Write |
| guint64 | max-raw-audio-drift | Read / Write |
| gboolean | reserved-prefill | Read / Write / Construct |
Description
This element merges streams (audio and video) into MJ2 (.mj2) files.
The following background intends to explain why various similar muxers are present in this plugin.
The QuickTime file format specification served as basis for the MP4 file format specification (mp4mux), and as such the QuickTime file structure is nearly identical to the so-called ISO Base Media file format defined in ISO 14496-12 (except for some media specific parts). In turn, the latter ISO Base Media format was further specialized as a Motion JPEG-2000 file format in ISO 15444-3 (mj2mux) and in various 3GPP(2) specs (3gppmux). The fragmented file features defined (only) in ISO Base Media are used by ISMV files making up (a.o.) Smooth Streaming (ismlmux).
A few properties (“movie-timescale”, “trak-timescale”) allow adjusting some technical parameters, which might be useful in (rare) cases to resolve compatibility issues in some situations.
Some other properties influence the result more fundamentally. A typical mov/mp4 file's metadata (aka moov) is located at the end of the file, somewhat contrary to this usually being called "the header". However, a “faststart” file will (with some effort) arrange this to be located near start of the file, which then allows it e.g. to be played while downloading. Alternatively, rather than having one chunk of metadata at start (or end), there can be some metadata at start and most of the other data can be spread out into fragments of “fragment-duration”. If such fragmented layout is intended for streaming purposes, then “streamable” allows foregoing to add index metadata (at the end of file).
Example pipelines
1 |
gst-launch-1.0 v4l2src num-buffers=50 ! queue ! jp2kenc ! mj2mux ! filesink location=video.mj2 |
Documentation last reviewed on 2011-04-21
Synopsis
Element Information
plugin |
isomp4 |
author |
Thiago Sousa Santos <thiagoss@embedded.ufcg.edu.br> |
class |
Codec/Muxer |
Element Pads
name |
audio_%u |
direction |
sink |
presence |
request |
details |
audio/mpeg, mpegversion=(int)1, layer=(int)3, channels=(int)[ 1, 2 ], rate=(int)[ 1, 2147483647 ] |
| audio/mpeg, mpegversion=(int)4, stream-format=(string)raw, channels=(int)[ 1, 8 ], rate=(int)[ 1, 2147483647 ] |
name |
video_%u |
direction |
sink |
presence |
request |
details |
video/mpeg, mpegversion=(int)4, systemstream=(boolean)false, width=(int)[ 16, 2147483647 ], height=(int)[ 16, 2147483647 ] |
| video/x-divx, divxversion=(int)5, width=(int)[ 16, 2147483647 ], height=(int)[ 16, 2147483647 ] | |
| video/x-h264, stream-format=(string)avc, alignment=(string)au, width=(int)[ 16, 2147483647 ], height=(int)[ 16, 2147483647 ] |
name |
src |
direction |
source |
presence |
always |
details |
video/quicktime, variant=(string)iso-fragmented |
Property Details
The “dts-method” property
“dts-method” GstQTMuxDtsMethods
Method to determine DTS time (DEPRECATED).
Flags: Read / Write / Construct
Default value: reorder
The “faststart” property
“faststart” gboolean
If the file should be formatted for faststart (headers first).
Flags: Read / Write
Default value: FALSE
The “faststart-file” property
“faststart-file” gchar *
File that will be used temporarily to store data from the stream when creating a faststart file. If null a filepath will be created automatically.
Flags: Read / Write / Construct
Default value: NULL
The “fragment-duration” property
“fragment-duration” guint
Fragment durations in ms (produce a fragmented file if > 0).
Flags: Read / Write / Construct
Default value: 2000
The “moov-recovery-file” property
“moov-recovery-file” gchar *
File to be used to store data for moov atom making movie file recovery possible in case of a crash during muxing. Null for disabled. (Experimental).
Flags: Read / Write / Construct
Default value: NULL
The “movie-timescale” property
“movie-timescale” guint
Timescale to use in the movie (units per second, 0 == default).
Flags: Read / Write / Construct
Default value: 0
The “presentation-time” property
“presentation-time” gboolean
Calculate and include presentation/composition time (in addition to decoding time).
Flags: Read / Write / Construct
Default value: TRUE
The “streamable” property
“streamable” gboolean
If set to true, the output should be as if it is to be streamed and hence no indexes written or duration written.
Flags: Read / Write / Construct
Default value: TRUE
The “trak-timescale” property
“trak-timescale” guint
Timescale to use for the tracks (units per second, 0 is automatic).
Flags: Read / Write / Construct
Default value: 0
The “reserved-bytes-per-sec” property
“reserved-bytes-per-sec” guint
Multiplier for converting reserved-max-duration into bytes of header to reserve, per second, per track.
Flags: Read / Write / Construct
Allowed values: <= 10000
Default value: 550
The “reserved-duration-remaining” property
“reserved-duration-remaining” guint64
Reports the approximate amount of remaining moov header space reserved using reserved-max-duration.
Flags: Read
Default value: 0
The “reserved-max-duration” property
“reserved-max-duration” guint64
When set to a value > 0, reserves space for index tables at the beginning of the file.
Flags: Read / Write
Default value: 18446744073709551615
The “reserved-moov-update-period” property
“reserved-moov-update-period” guint64
When used with reserved-max-duration, periodically updates the index tables with information muxed so far.
Flags: Read / Write
Default value: 18446744073709551615
The “interleave-bytes” property
“interleave-bytes” guint64
Interleave between streams in bytes.
Flags: Read / Write
Default value: 0
The “interleave-time” property
“interleave-time” guint64
Interleave between streams in nanoseconds.
Flags: Read / Write
Default value: 250000000
The “max-raw-audio-drift” property
“max-raw-audio-drift” guint64
Maximum allowed drift of raw audio samples vs. timestamps in nanoseconds.
Flags: Read / Write
Default value: 40000000
The “reserved-prefill” property
“reserved-prefill” gboolean
Prefill samples table of reserved duration.
Flags: Read / Write / Construct
Default value: FALSE