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Em 04/10/2018 20:16, "Erik Ackermann" <[email protected]> escreveu: > > What is your CPU usage? Also what codec library are you using? I am not > familiar with mobile but that seems way too slow. In general phones should > have hardware acceleration for video, so try to use a hardware accelerated > codec instead of pure software. > > On Thu, Oct 4, 2018 at 9:18 AM Corentin BRUNEAU <[email protected]> > wrote: > > > Hello all, > > I’m using libav to write a C++ program that extracts frames from a video > > at a given timestamp. > > I’m a beginner in multimedia processing but I understood there are frames > > that can be decoded without using others (I frames) and frames the are > > dependent on others (P and B frames). > > Right now I use av_seek_frame() with the AVSEEK_FLAG_BACKWARD flag to seek > > to the previous closest keyframe frame and if it’s not the initially > > desired frame, I start decoding from the current frame toward the desired > > frame. > > The problem is I have a video in which the first and the second keyframes > > are separated by 8 seconds and if I seek the frame at the 6th second, the > > whole process of decoding every frame until I reach the desired frame takes > > 5 seconds (on an Android mid-range device) which seems too long to me. > > > > Is there any more optimized way to do this ? > > > > Best regards, > > Corentin Bruneau. > > _______________________________________________ > > libav-api mailing list > > [email protected] > > https://lists.libav.org/mailman/listinfo/libav-api > _______________________________________________ > libav-api mailing list > [email protected] > https://lists.libav.org/mailman/listinfo/libav-api _______________________________________________ libav-api mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-api
