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Properties
| gint | bufsize | Read / Write |
| GstMplexFormat | format | Read / Write |
| gint | mux-bitrate | Read / Write |
| gint | packets-per-pack | Read / Write |
| gint | sector-size | Read / Write |
| gboolean | system-headers | Read / Write |
| gboolean | vbr | Read / Write |
Description
This element is an audio/video multiplexer for MPEG-1/2 video streams and (un)compressed audio streams such as AC3, MPEG layer I/II/III. It is based on the mjpegtools library. Documentation on creating MPEG videos in general can be found in the
MJPEG Howtoand the man-page of the mplex tool documents the properties of this element, which are shared with the mplex tool.
Example pipeline
1 |
gst-launch-1.0 -v videotestsrc num-buffers=1000 ! mpeg2enc ! mplex ! filesink location=videotestsrc.mpg |
If several streams are being multiplexed, there should (as usual) be a queue in each stream, and due to mplex' buffering the capacities of these may have to be set to a few times the default settings to prevent the pipeline stalling.
Synopsis
Element Information
plugin |
mplex |
author |
Andrew Stevens <andrew.stevens@nexgo.de> Ronald Bultje <rbultje@ronald.bitfreak.net> Mark Nauwelaerts <mnauw@users.sourceforge.net> |
class |
Codec/Muxer |
Element Pads
name |
audio_%u |
direction |
sink |
presence |
request |
details |
audio/mpeg, mpegversion=(int)1, layer=(int)[ 1, 3 ], channels=(int)[ 1, 8 ], rate=(int)[ 8000, 96000 ] |
| audio/x-ac3, channels=(int)[ 1, 8 ], rate=(int)[ 8000, 96000 ] | |
| audio/x-dts | |
| audio/x-raw, format=(string){ S16BE, S20BE, S24BE }, rate=(int){ 48000, 96000 }, channels=(int)[ 1, 6 ] |
name |
video_%u |
direction |
sink |
presence |
request |
details |
video/mpeg, mpegversion=(int){ 1, 2 }, systemstream=(boolean)false, width=(int)[ 16, 4096 ], height=(int)[ 16, 4096 ], framerate=(fraction)[ 0/1, 2147483647/1 ] |
name |
src |
direction |
source |
presence |
always |
details |
video/mpeg, systemstream=(boolean)true |
Property Details
The “bufsize” property
“bufsize” gint
Target decoders video buffer size (kB) [default determined by format if not explicitly set].
Flags: Read / Write
Allowed values: [20,4000]
Default value: 46
The “format” property
“format” GstMplexFormat
Encoding profile format.
Flags: Read / Write
Default value: DVD MPEG-2
The “mux-bitrate” property
“mux-bitrate” gint
Bitrate of output stream in kbps (0 = autodetect).
Flags: Read / Write
Allowed values: [0,15360]
Default value: 0
The “packets-per-pack” property
“packets-per-pack” gint
Number of packets per pack for generic formats.
Flags: Read / Write
Allowed values: [1,100]
Default value: 1
The “sector-size” property
“sector-size” gint
Specify sector size in bytes for generic formats.
Flags: Read / Write
Allowed values: [256,16384]
Default value: 2048
The “system-headers” property
“system-headers” gboolean
Create system header in every pack for generic formats.
Flags: Read / Write
Default value: FALSE
The “vbr” property
“vbr” gboolean
Whether the input video stream is variable bitrate.
Flags: Read / Write
Default value: FALSE