[gst-devel] I'm stuck into a demuxer problem.

[Wim Taymans]

On Tue, 2008-11-25 at 14:53 +0100, franchan wrote:
> Hello,
> 
> I seek some suggestions to find a bug in my own mp4 demuxer.
> This is actually a wrapper around a proprietary mp4 parser.
> (For inspiration I looked into qtdemux, so it is based on that pull scheduling).
> The demuxer only support pull scheduling
> (I seem to better understand that operation model).
> 
> The pipeline works fine when it is "hard-coded" e.g.
> filesrc ! mp4demux name=demux \
>    demux.video_01! queue ! video_decoder ! ffmpegcolorspace! xvimagesink \
>    demux.audio_01! queue ! audio_decoder ! audioconvert ! alsasink
> 
> When I use the playbin to create my pipeline,
> typefinding works fine until a certain point:
> source links with demux links the video and audio queues (always in that order).
> 
> But further linking the pipeline is not happening anymore.
> The video & audio decoder, which are proprietery as well,
> seem to be stuck in their gst_pad_push().
> These are not linked with the corresponding queues.
> While the demuxer's pull task is blocked on pushing some encoded video frame.
> 
> It is as if playbin thinks that all is done.
> Why does it not continue creating the renderers (alsasink/xvimagesink).
> It seldom goes into the PLAYING state.
> (1 in 30 times it may start playing though).
> 
> I'm out of inspiration on what might be wrong ...

If you have dynamic pads, check if you emit the no-more-pads signal
after you added all pads.

Wim
> 
> When the qtdemux is selected by playbin, all works as expected,
> I think the qtdemux might not operate in pull scheduling though.
> That's why I think the problem is in the mp4 demuxer
> (not in the other proprietary decoders).
> 
> Thanks in advance,
> francis
> 
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