enricobuehler
f204a89cef
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On-box A/B on the .173 Ryzen 7000 iGPU (720p60, real composition via input injection — an idle virtual desktop composes ~1 fps and gives meaningless encode timings): the encode-time-first `quality=speed` preset + explicit `bf=0` cut host-side encode_us from ~36 ms to ~19.5 ms. The blocking-poll idea from the prior commit was WRONG and is reverted to a single non-blocking receive (default PUNKTFUNK_FFWIN_POLL_MS=0): libavcodec's hevc_amf holds ~2 frames before releasing the oldest (needs frame N+2 to flush N), so a spin between submits provably never yields the owed AU — verified with a 150 ms cap pegging at exactly 150 ms across every usage preset and pipeline depth. That ~2-frame buffer is inherent to the libavcodec wrapper, not host scheduling; the real latency lever is a direct AMF SDK encoder (the AMF analogue of the direct-NVENC path), tracked as the next AMD work item. The env knob is retained for a future VCN/driver where a bounded spin can help. Also measured and rejected: PUNKTFUNK_ZEROCOPY=1 on AMF is ~2x WORSE (68 ms vs 36 ms) — the D3D11 import path adds sync overhead beyond the readback it saves, so the system-memory default stays. GPU-priority elevation is already process-wide (dxgi.rs), so it covers the iGPU encode session with no change. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>