[Ffmpeg-devel] h264 stream decoding problem

[Klaas-Pieter Vlieg]

Hi
>
> From: Francois Oligny-Lemieux [mailto:eucloid at gmail.com] 
> Sent: 23 February 2007 22:32
> 
> Hi,
> 
> On 2/23/07, Gonzalo Berdeal <gonberdeal at hotmail.com> wrote:
> >
> >
> > Hello,
> >
> > I think that all the non-keyframes that arrive to the
> > avcodec_decode_video() function are discarded by this function 
> > automatically and the function will begin working when one keyframe 
> > arrives. So you don't need to worry if the first frame arriving to 
> > avcodec_decode_video() function is keyframe or not.
> 
> 
> no not true.
> 
> There is a need to start on a key frame (at least in h264.c). 
> Otherwise it shows motion over empty picture.
> 
Actually I've substituted avcodec_decode_video() by a call to
a dsp function, since I'm using ffmpeg on an embedded platform.
That dsp must have a keyframe as the very first frame. Are there
ffmpeg functions where I can test for keyframes before calling
avcodec_decode_video() ?

Klaas-Pieter Vlieg