Re-measured against a host carrying #95, from .21 (RTX 5070 Ti, av1_nvenc) to
.221, on glass:
Intel Arc, auto -> native-d3d11va 4K60, decode 1.4 ms, e2e 16.7 ms p50
RTX 3500 Ada, pinned native-d3d11va 4K60, decode 1.0 ms
RTX 3500 Ada, pinned native-vulkan 4K60, decode 11.6-16.7 ms
Plus a 5-minute Arc soak: 297 stats lines, 60 fps, decode 1.3 ms, e2e 10.9/14.8 ms
p50, and exactly one WARN in the whole run — the hardware_verified=false notice
itself. No refusals, no demotions, no concealed runs.
Three things that follow.
The rung is no longer a one-session curiosity: it decodes 4K60 AV1 on TWO
vendors and survives a soak. The Arc leg matters twice over, because the Arc
advertises no SAMPLED usage on any decode profile — zero-copy Vulkan Video
cannot work there — so `auto` demoting to D3D11VA and then decoding is the
whole demotion path working as designed.
It is roughly 10x faster than the Vulkan AV1 leg on the SAME NVIDIA GPU. That
is the strongest argument yet for eventually letting `auto` pick it ahead of
Vulkan Video, which is exactly what `verified` gates.
And it stays `verified = false` anyway, because the missing piece is specific:
there is no frame-hash parity against libavcodec. Every other verified pair in
that table earned it with one, and pf-dxvadec has no harness that could produce
one — `libav_picparams_parity` compares picture parameters on the CPU and never
decodes a frame. Building that harness is the work that promotes this rung; a
fourth session is not. The evidence string now says so, so the next reader does
not have to rediscover which half is missing.
The VAAPI row is corrected in the same spirit rather than left as a bare "NO":
the reachable VAAPI box (.25, RDNA3) reports VAProfileAV1Profile0 /
VAEntrypointVLD and advertises no Vulkan AV1 decode at all, which makes it the
right box to prove that rung on and an unambiguous oracle when it happens. What
stopped it is recorded too — no punktfunk checkout there and 4 GB of usable RAM.
Documentation only — no behaviour change, and no flag flipped.
enricobuehler
19c9165d4b