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

[Michael Hunold <hunold@convergence.de>]

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)

> Is there another trick ?
> Stefan Lucke
I published my problems on the libavcodec mailing list, but none of the 
developers has been interested in fixing these problems so far.

I'm looking for debugging these problems, but the libavcodec code is 
rather obfuscated and I currently don't have the time. 8-(

CU
Michael.


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