Hi all! While testing .prores files I noticed I missed this codec in my hack for faster reverse playback of I-only video tracks ... Now I added it there, and on my 4 core AMD reverse playback (2x, 1x) indeed faster now. I wonder how much I break shuttle controller higher speeds or complex plugin chains? Hack attached. diff --git a/cinelerra-5.1/cinelerra/ffmpeg.C b/cinelerra-5.1/cinelerra/ffmpeg.C index 70098ca..32867de 100644 --- a/cinelerra-5.1/cinelerra/ffmpeg.C +++ b/cinelerra-5.1/cinelerra/ffmpeg.C @@ -1192,10 +1192,19 @@ int FFVideoStream::video_seek(int64_t pos) if( pos == curr_pos-1 && !seeked ) return 0; // if close enough, just read up to current int gop = avctx->gop_size; - if( gop < 4 ) gop = 4; + if( gop < 4 && gop != 0) gop = 4; if( gop > 64 ) gop = 64; + if( gop == 0 ) gop = 1; + //fprintf(stderr, "GOP: %i \n", gop); int read_limit = curr_pos + 3*gop; if( pos >= curr_pos && pos <= read_limit ) return 0; + // fixup for I-only codecs, not sure why it needed with ffmpeg 4.2 + if (st->codecpar->codec_id == AV_CODEC_ID_DVVIDEO || st->codecpar->codec_id == AV_CODEC_ID_MJPEG || + st->codecpar->codec_id == AV_CODEC_ID_FFVHUFF || st->codecpar->codec_id == AV_CODEC_ID_DNXHD || + st->codecpar->codec_id ==AV_CODEC_ID_HUFFYUV || st->codecpar->codec_id == AV_CODEC_ID_PRORES) { + gop = 1; + if( seek(pos - 2*gop, frame_rate) < 0 ) return -1; + } // guarentee preload more than 2*gop frames if( seek(pos - 3*gop, frame_rate) < 0 ) return -1; return 1;