[gst-devel] audio playback shift in time

[Wim Taymans]

On Thu, 2009-09-10 at 07:46 +0200, franchan wrote:
> Hello gstreamer developers,
> 
> Nobody knows an answer to my earlier question?

It could be this bug:

http://bugzilla.gnome.org/show_bug.cgi?id=594136

Wim

> 
> Thanks,
> francis
> 
> 
> On Fri, Sep 4, 2009 at 5:23 PM, franchan <francis.meyvis at gmail.com> wrote:
> > Hello,
> >
> > I have a custom mpegts demux. It gets data through the appsrc.
> > Into the appsrc I push the mpegts coming from an UDP socket.
> > This allows to do changing from UDP socket (other mpegts stream).
> >
> > When this happens I change the playbin2 first from playing to ready,
> > Then back to playing again.
> >
> > The mpegts demux, when it sees the state change,
> > removes its pads and waits for the new PAT/PMT information.
> > When the mpegts sees the new PAT PMT, it recreates the new pads.
> >
> > Before the mpegts plugin sends out the PES data,
> > I first send a flush-start, flush-stop and the new_segment event downstream.
> > with the start and position time corresponding to the first PTS
> > detected in the new mpegts data.
> >
> > For the first socket, when starting playback, all works fine: audio
> > and video are in sync.
> > When switching the socket the video starts playing fine after 1 to 2 seconds.
> >
> > However the audio behaves odd: its playback is delayed
> > by the amount of time socket 1 has been playing.
> >
> > I verified the PTS timestamps on the input (in mpegts demux) and
> > the output (audio/video decoders). These all seem fine;
> > audio/video data is alternately push forward into the sinks.
> >
> > Still the alsa sink (or something else after the audio decoder)
> > introduces this strange delay.
> >
> > Can somebody tell me what is going on and how to remove this delay for audio
> > and still having the video play back as well?
> >
> > Thanks,
> > francis
> >
> 
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