[Ffmpeg-devel] Seeking with in an MPEGTS

Andy Parkins andyparkins
Tue Jun 21 15:30:28 CEST 2005

On Tuesday 2005 June 21 14:24, M?ns Rullg?rd wrote:

> > I've generated an MPEG transport stream containing an MPEG4 ES using
> > libavformat.  When playing back using ffplay, it plays back perfectly
> > until I perform a seek.  After that the stream breaks up for a bit, then
> > settles down but I start to get lots of error messages from h263.c; for
> > example.
> MPEG TS doesn't contain information about key frames, so when you seek you
> are likely to end up with some P/B frames before the next I frame.  Nothing
> to be worried about.  You could junk the decoder output until the next I
> frame comes around.  Look at AVFrame.key_frame.

Thanks; but I don't think this is the case.  I'm happy with the messed up 
picture, which fixes as soon as there is a key frame.  However, the quoted 
error messages continue well after the next key frame has been passed.  
Something about seeking is throwing off the decoder permanently.


Dr Andrew Parkins, M Eng (hons), AMIEE

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