Hi to all, I would like to encode MPEG-2 video with closed GOP of 12 frames, and a structure like IBBPBBPBBPBB.
For doing this, I am using these options : *-g 12* to set the GOP size *-bf 2* to set the max B frames between reference frames *-flags +cgop* to use Closed GOP *-sc_threshold 1000000000* to disable scene change detection *-b_strategy 0 *to disable adaptive number of B-frames *-mpv_flags +strict_gop* to enforce GOP size (mpegvideo private flag) The resulting command is : ffmpeg -i input.mxf -vcodec mpeg2video -g 12 -bf 2 -flags +cgop -b_strategy 0 -mpv_flags +strict_gop -sc_threshold 1000000000 -map 0:0 -y output.mxf However, the result is a GOP of 12 frames IBBPBBPBBPB*P*, with an ending P-frame. It seems the problem comes from these lines : https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/mpegvideo_enc.c#L1491 How can I do to fix this ? Is there a way to enforce GOP finishing by a B-frame ? Is there something missing ? Thanks. Valentin _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
