extract multiple elementary streams using one tsdemux element?

[Adams, Bruce (KMLWG)]

Hi,
     I'm trying to extract multiple elementary streams (belonging to different programs) from a transport stream simultaneously.
Currently I can only get this to work by adding a tee element and connecting a separate tsdemux for each program. Is this the only way? It seems an unnecessary complication.

If I run a pipeline like:

GST_DEBUG=6 gst-launch-1.0 -v filesrc location=foo.ts ! tsdemux name=demux  demux.audio_0_006a ! mpegaudioparse ! mpg123audiodec ! audioresample ! audio/x-raw, rate=8000 ! wavenc ! filesink location=audio1.wav 2>&1 | grep "creating pad" | grep audio | tee audiopads

It looks like the tsdemux element provides pads for all the audio streams:

GST_DEBUG=6 gst-launch-1.0 -v filesrc location=foo.ts ! tsdemux name=demux  demux.audio_0_006a ! mpegaudioparse ! mpg123audiodec ! audioresample ! audio/x-raw, rate=8000 ! wavenc ! filesink location=audio1.wav 2>&1 | grep "creating pad" | grep audio | tee audiopads2
0:00:01.284886317 28409 0x5643c2334320 LOG                  tsdemux tsdemux.c:1594:create_pad_for_stream: stream:0x7fae8c00cd00 creating pad with name audio_0_0066 and caps audio/mpeg, mpegversion=(int)1
0:00:01.285548634 28409 0x5643c2334320 LOG                  tsdemux tsdemux.c:1594:create_pad_for_stream: stream:0x7fae8c00ef10 creating pad with name audio_0_006a and caps audio/mpeg, mpegversion=(int)1
0:00:01.295740367 28409 0x5643c2334320 LOG                  tsdemux tsdemux.c:1594:create_pad_for_stream: stream:0x7fae8c09eb80 creating pad with name audio_1_00ca and caps audio/mpeg, mpegversion=(int)1
[snip]
0:00:01.316647548 28409 0x5643c2334320 LOG                  tsdemux tsdemux.c:1594:create_pad_for_stream: stream:0x7fae8c0b5400 creating pad with name audio_1_0044 and caps audio/mpeg, mpegversion=(int)1

So it looks like a single tsdemux can be used to get at all the elementary streams.
However, when I try to do this programmatically I find I only get the elementary streams
for a single program as if the program_number property is set (explicitly setting it to -1 does not help).

Similarly from the command line I'd like to do something like:

gst-launch-1.0 -v filesrc location=foo.ts ! tsdemux name=demux \
demux.audio_0_0066 ! queue ! mpegaudioparse ! mpg123audiodec ! audioresample ! audio/x-raw, rate=8000 ! wavenc ! filesink location=audio1.wav \
demux.audio_1_00ca ! queue ! mpegaudioparse ! mpg123audiodec ! audioresample ! audio/x-raw, rate=8000 ! wavenc ! filesink location=audio2.wav

Which fails as follows:

WARNING: from element /GstPipeline:pipeline0/GstTSDemux:demux: Delayed linking failed.
Additional debug info:
./grammar.y(506): gst_parse_no_more_pads (): /GstPipeline:pipeline0/GstTSDemux:demux:
failed delayed linking pad  audio_1_00ca of GstTSDemux named demux to some pad of GstQueue named queue1

Regards,

Bruce.



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