[FFmpeg-devel] Skip Frame in MJPEG video

christophe laferriere christophe.laferriere at gmail.com
Fri May 27 15:16:02 CEST 2011

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.

> [...]
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