| Codec / encoder | H.264 / AVC · x264 -preset medium |
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| Command | ffmpeg -hide_banner -loglevel error -y -i STRIP.y4m -frames:v 60 -pix_fmt yuv420p10le -c:v libx264 -preset medium -profile:v high10 -x264-params keyint=30:min-keyint=30:scenecut=0:open-gop=0:bframes=3:b-pyramid=normal:threads=8 -crf <q> -f h264 OUT |
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| Strip geometry | full width, cut from the middle of the frame; mb16 (unit 16 lines): heights 26, 42, 58, 74; band64 (unit 64 lines): heights 46, 110, 174, 238, 302; the last band is always partial; even heights (4:2:0 cropping) |
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| Points | crf 16, 28 |
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| Sources | RitualDance, Witcher3, NocturneDance |
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| Profile | High (8-bit) / High 10 (10-bit) |
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| Level / buffer | H.264 Annex A Table A-1; bitrate and CPB limits × cpbBrNalFactor (High 1500, High 10 3600); level written in the SPS. Level = the lowest one covering size, sample rate and the actual bitrate; buffer in the name = that level's MaxCPB. |
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| Structure | 60 frames = 2 GOP × 30 (keyframes at frames 0 and 30, closed GOP), 3 B-frames with pyramid, 4:2:0, bit depth as in the source. Container: .264 (Annex B). |
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| Verification | reference decoder JM 19.1 ldecod (coded-frame buffer raised to 64 MB for 8K) → YUV md5, cross-checked with the ffmpeg decoder md5, 60 frames, keyframes at 0 and 30, profile/level read back with ffprobe, PSNR/SSIM against the source. |
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