Frames are published one superblock row at a time once loop filtered; a post stage per frame
(own thread) assembles bands from the tile strips, filters them in raster order and builds the
output picture, while the next frame's tile columns decode and wait per band for the reference
rows they read. Bit-exact with 1, 3 and all threads. Draft mode skips the loop filter of frames
that refresh no reference slot. av1dec / hevcdec bench knobs and VP9 / AV1 4K playback scenarios
in the bench.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
1080p 8-bit bench: 55 -> 98 fps single-thread CPU time; 45 -> 115 fps wall with 14 threads
(best of 4 on a heavily loaded machine). Still bit-exact against the ffmpeg oracle on the
whole fixture matrix (1 thread and thread pool). Fixture generation uses per-call unique
temporary names (concurrent tests generating the same fixture raced on rename).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
