[gstreamer-bugs] [Bug 550613] [mpegtsmux] Add support for ac3/dts/lpcm

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-bad | Ver: HEAD CVS




------- Comment #18 from vanista  2008-12-12 22:24 UTC -------
Created an attachment (id=124557)
 --> (http://bugzilla.gnome.org/attachment.cgi?id=124557&action=view)
Implementation of ac3_stream_descriptor

Finally found the specifications! It's all in ATSC A/52-2001, Annex A : AC-3
Elementary Streams in the MPEG-2 Multiplex

I've hardcoded a few values to simplify the implementation based on what FFMPEG
uses as default encoding parameters. I set the proper or most compatible values
for the given caps. Additionally the bitrate is required in this descriptor, so
we need to pass the parameter through filtered caps. Maybe this whole structure
should be provided by the encoder as codec-data, but I'm not sure if the
structure is standard in other containers (AVI, 3gpp...)

gst-launch-0.10 mpegtsmux name=mux m2ts-mode=true ! filesink
location=output.m2ts audiotestsrc num-buffers=10 ! audio/x-raw-int, rate=48000
! audioconvert ! audio/x-raw-int, channels=2 ! ffenc_ac3 bitrate=256000 !
audio/x-ac3, bitrate=256 ! mux. videotestsrc num-buffers=10 ! x264enc
cabac=false ! mux.


http://www.dolby.com.cn/uploadedFiles/Chinese_CN/Consumer/Dolby_Technologies/Dolby_Digital/Dolby_Digital_Links/a_52a.pdf

http://www.scte.org/documents/standards/approved/SCTE542006.pdf


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