[FFmpeg-devel] Skip Frame in MJPEG video

[Michael Niedermayer]

On Fri, May 27, 2011 at 03:16:02PM +0200, christophe laferriere wrote:
> 
> Le 27 mai 2011 à 15:08, Michael Niedermayer a écrit :
> 
> > On Fri, May 27, 2011 at 10:21:36AM +0200, christophe laferriere wrote:
> >> I mean that I'm looking for a way to skip all bytes (in a FILE* in my case) from a same frame (for example in order to maintain a certain framerate.) so I was wondering how does the equivalent piece of code from ffmpeg look like.
> > 
> > the frame rate maintaince code is in ffmpeg.c in
> > if(video_sync_method){
> > 
> > one could say the:
> >    if (nb_frames <= 0)
> >        return;
> > 
> > is doing the skiping
> 
> Ok. Thanks for pointing this out!
> 
> > 
> > This does not work on "FILE *" level it works on frame level.
> > You need a demuxer first to get the frames out of a file and then you
> > can in case of intra only codecs skip frames.
> 
> Ok so then I'd like to have a look at the demuxer code for mjpeg files. But don't bother, I'm gonna search by myself. I guess (and hope) it's in the libavcodec directory, in mjpeg* files.

demuxer is in libavformat
and which depends on how mjpeg is stored, it might be avidec.c
ffprobe will tell you more about what is used for your file

[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

You can kill me, but you cannot change the truth.
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