mplex

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 Howto and the man-page of the mplex tool documents the properties of this element, which are shared with the mplex tool.

Example pipeline

 gst-launch-1.0 -v videotestsrc num-buffers=1000 ! mpeg2enc ! mplex ! filesink location=videotestsrc.mpg

This example pipeline will encode a test video source to an MPEG1 elementary stream and multiplexes this to an MPEG system stream.

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.

Hierarchy

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──mplex

Factory details

Authors: – Andrew Stevens , Ronald Bultje , Mark Nauwelaerts

Classification: – Codec/Muxer

Rank – none

Plugin – mplex

Package – GStreamer Bad Plug-ins

Pad Templates

audio_%u

audio/mpeg:
    mpegversion: 1
          layer: [ 1, 3 ]
       channels: [ 1, 8 ]
           rate: [ 8000, 96000 ]
audio/x-ac3:
       channels: [ 1, 8 ]
           rate: [ 8000, 96000 ]
audio/x-dts:
audio/x-raw:
         format: { S16BE, S20BE, S24BE }
           rate: { (int)48000, (int)96000 }
       channels: [ 1, 6 ]

Presence – request

Direction – sink

Object type – GstPad

src

video/mpeg:
   systemstream: true

Presence – always

Direction – src

Object type – GstPad

video_%u

video/mpeg:
    mpegversion: { (int)1, (int)2 }
   systemstream: false
          width: [ 16, 4096 ]
         height: [ 16, 4096 ]
      framerate: [ 0/1, 2147483647/1 ]

Presence – request

Direction – sink

Object type – GstPad

Properties

bufsize 

“bufsize” gint

Target decoders video buffer size (kB) [default determined by format if not explicitly set]

Flags : Read / Write

Default value : 0

format 

“format” GstMplexFormat *

Encoding profile format

Flags : Read / Write

Default value : mpeg-1 (0)

mux-bitrate 

“mux-bitrate” gint

Bitrate of output stream in kbps (0 = autodetect)

Flags : Read / Write

Default value : 0

packets-per-pack 

“packets-per-pack” gint

Number of packets per pack for generic formats

Flags : Read / Write

Default value : 1

sector-size 

“sector-size” gint

Specify sector size in bytes for generic formats

Flags : Read / Write

Default value : 2048

system-headers 

“system-headers” gboolean

Create system header in every pack for generic formats

Flags : Read / Write

Default value : false

vbr 

“vbr” gboolean

Whether the input video stream is variable bitrate

Flags : Read / Write

Default value : false

Named constants

GstMplexFormat

Members

mpeg-1 (0) – Generic MPEG-1
vcd (1) – Standard VCD
vcd-nsr (2) – User VCD
mpeg-2 (3) – Generic MPEG-2
svcd (4) – Standard SVCD
svcd-nsr (5) – User SVCD
vcd-still (6) – VCD Stills sequences
svcd-still (7) – SVCD Stills sequences
dvd-nav (8) – DVD MPEG-2 for dvdauthor
dvd (9) – DVD MPEG-2
atsc-480i (10) – ATSC 480i
atsc-480p (11) – ATSC 480p
atsc-720p (12) – ATSC 720p
atsc-1080i (13) – ATSC 1080i

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