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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"> I’m trying to extract multiple elementary streams (belonging to different programs) from a transport stream simultaneously.<o:p></o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I run a pipeline like:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It looks like the tsdemux element provides pads for all the audio streams:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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<o:p></o:p></p>
<p class="MsoNormal">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<o:p></o:p></p>
<p class="MsoNormal">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<o:p></o:p></p>
<p class="MsoNormal">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<o:p></o:p></p>
<p class="MsoNormal">[snip]<o:p></o:p></p>
<p class="MsoNormal">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<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So it <i>looks</i> like a single tsdemux can be used to get at all the elementary streams.<o:p></o:p></p>
<p class="MsoNormal">However, when I try to do this programmatically I find I only get the elementary streams
<o:p></o:p></p>
<p class="MsoNormal">for a single program as if the program_number property is set (explicitly setting it to -1 does not help).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Similarly from the command line I’d like to do something like:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">gst-launch-1.0 -v filesrc location=foo.ts ! tsdemux name=demux \<o:p></o:p></p>
<p class="MsoNormal">demux.audio_0_0066 ! queue ! mpegaudioparse ! mpg123audiodec ! audioresample ! audio/x-raw, rate=8000 ! wavenc ! filesink location=audio1.wav \<o:p></o:p></p>
<p class="MsoNormal">demux.audio_1_00ca ! queue ! mpegaudioparse ! mpg123audiodec ! audioresample ! audio/x-raw, rate=8000 ! wavenc ! filesink location=audio2.wav<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Which fails as follows:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">WARNING: from element /GstPipeline:pipeline0/GstTSDemux:demux: Delayed linking failed.<o:p></o:p></p>
<p class="MsoNormal">Additional debug info:<o:p></o:p></p>
<p class="MsoNormal">./grammar.y(506): gst_parse_no_more_pads (): /GstPipeline:pipeline0/GstTSDemux:demux:<o:p></o:p></p>
<p class="MsoNormal">failed delayed linking pad audio_1_00ca of GstTSDemux named demux to some pad of GstQueue named queue1<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Bruce.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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