mpv --hwdec=vaapi --vo=gpu plays bbb_1080p30 smoothly per operator
inspection. Three independent fixes landed in the fork: format-cache
invalidation on multi-resolution sessions (Fix 1), conditional
DRM_FORMAT_MOD_INVALID for non-64-aligned pitches (Fix 2), decoupled
CAPTURE buffer pool with LRU recycling (Fix 3, the load-bearing one).
Documented limitations carried into iter3 substrate: Option-A
statistical mitigation not provably race-free under pathological
workloads; multi-context safety not addressed; LAST_OUTPUT_*
process-global cache; iter1 carry-over Sonnet 7.x questions still open.
Open recommendation for iter3 substrate: re-run iter1's 4-consumer
regression matrix under Fix 3, especially Firefox 150 multi-video.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
