[vdr] Re: StillPicture (I-frame) decoding with ffmpeg

[Stefan Lucke <stefan@lucke.in-berlin.de>]

On Mittwoch, 14. April 2004 13:53, Michael Hunold wrote:
> Hello Stefan,
> 
> On 04/14/04 09:13, Stefan Lucke wrote:
> > does someone know how this works ?
> > 
> > Even after calling the decoder with:
> > 	avcodec_decode_video(context,picture,&got_picture,NULL,0);
> > got_picture is still false.
> 
> I noticed several anomalies with the mpeg2 decoder from libavcodec.
> 
> 1) As you already noticed, "got_picture" is wrong after an I-Frame has 
> been put to the decoder. For some unknown reason, the decoder delays the 
> delivery.
> 
> 2) If you start to deliver an new GOP, starting with the I-Frame, 
> libavcodec throws away the whole GOP (normally 12 frames!) and starts 
> with the next I-Frame it gets. If you start in the middle of a GOP, then 
> it will catch the I-Frame, but only after the delay mentioned in 1)

Based on your analysis I played around with "closed gop" and "broken link"
flags but still no success :-(.

Do you know the size of the delay mentioned in 1)  ?


Stefan Lucke



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