[gst-devel] detecting audio drop

[Tony Beville]

I'm a relative novice with gstreamer, and had just developed some plugins for our emebedded system to use the the hardware video decoding, scaling and colorspace conversion.
 
We have written a custom app for playback, and for the most part it works great.  With some videos, though, the time to display a frame is too slow for the given framerate, and when playing, the audio will stop eventually, but the video will continue.  I am assuming this happens because the two threads are out of sync.  Pipeline looks like something this:
 
filesrc location=vidfile ! qtdemux name=d ! { queue ! decodebin  !  autovideosink } { d. ! queue  ! decodebin ! audioconvert ! autoaudiosink }
 
 If I add the videorate element to the pipeline, and slow down the framerate, those videos will play better (but of course more choppy):
 
filesrc location=vidfile  ! qtdemux name=d ! { queue ! decodebin ! videorate ! video/x-raw-yuv, framerate=15/1 !  autovideosink  } { d. ! queue  ! decodebin ! audioconvert ! autoaudiosink }
 
 
What I would like to do is have the app detect when the when the audio drops, and dynamically lower the caps filter to a slower rate until audio restarts.  
 
I am guessing there is a signal or message or callback I can set, but I am unable to work out what.  Is this even possible?
 
Thanks,
 
Tony
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