| Codec / encoder | AV1 · ffmpeg 6.1 av1_nvenc (RTX 5060 Ti): -preset p7 -tune hq -multipass fullres -rc-lookahead 32 -spatial-aq 1 -temporal-aq 1 -bf 3 -b_ref_mode middle -g 30 -keyint_min 30 -forced-idr 1 -no-scenecut 1 |
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| Rate control | CBR: -rc cbr -b:v T -maxrate T -bufsize VBV |
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| Points | target T = 20, 30, 40, 50, 60, 70, 80, 90, 100 Mbit/s; each stream calibrated to 96–100 % of T (up to 8 iterations) |
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| VBV | min(level buffer, 1 s × target) |
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| Level / buffer | AV1 Annex A: the lowest level (main tier; high tier only when main does not fit) that covers the resolution, sample rate and the actual bitrate. seq_level_idx / seq_tier in the sequence header are patched to that level. Buffer in the name = the level's BufferSize (MaxBitrate × 1 s). |
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| Structure | 60 frames = 2 GOP × 30 (keyframes at frames 0 and 30, no scene-cut keyframes), random access with a B-pyramid, profile 0 (Main), bit depth as in the source, IVF container. |
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| Sequences | all 9 (up to 8K) |
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| Verification | Reference decode with aomdec (YUV md5 in the .json), keyframes checked with ffprobe, PSNR/SSIM against the source. |
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