First of all, let me say the FFMpeg project in general is awesome, and thanks a lot to the developers. Anyway, I have been coding an application which needs to import video files in as many formats as possible, and needs to do fast frame-accurate seeking. I started out trying to use the av_seek_frame(...) function to try to do seeking. Here is some example code:
int frame = <frame number to seek to goes here>; double t = framesToTime( frame );//function to convert frame number to time in seconds int64_t timestamp = t * AV_TIME_BASE; av_seek_frame( pFormatCtx , -1 , timestamp + pFormatCtx->start_time , AVSEEK_FLAG_BACKWARD ); this works fine for some video formats, and doesn't work at all in others. After searching the web, I came across this thread: http://readlist.com/lists/mplayerhq.hu/ffmpeg-user/1/5936.html with a lot of information. I tried all of the approaches mentioned to getting av_seek_frame(...) to work, but none worked for all formats. Here are my questions: -Is av_seek_frame(...) worth using? It seems that many people online have had trouble working with it, and if I need frame accurate seeking, should I use this function? -Where is the current file position stored when FFMpeg is reading a file? I figure that if I can't get av_seek_frame(...) working well, I could just index the file myself and get frame accurate seeking working in this manner. Thanks for all the help! ~Colin _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
