enricobuehler
e55ff1bb28
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Removes the "gray frames with motion" artifact on Vulkan-Video clients and lets AMD/NVENC hosts re-anchor after loss WITHOUT a 20-40x IDR spike. Client (pf-client-core): after a reference loss the hardware decoder conceals the missing-reference deltas (on RADV, a gray plate with new motion painted over) and returns Ok. The pump now freezes on the last good picture until a clean re-anchor instead of showing the concealment — lifting on a real IDR, an intra-refresh recovery mark (2nd wave boundary), or an LTR-RFI recovery anchor (1st). The frame_index gap is the early, precise loss signal and drives an RFI request. Host recovery signals (inert unless the backend supports them): - USER_FLAG_RECOVERY_POINT — intra-refresh wave boundary (NVENC constrained GDR). - USER_FLAG_RECOVERY_ANCHOR — AMD LTR reference-frame-invalidation recovery frame. AMD LTR-RFI (encode/windows/amf.rs) — the AMD twin of NVENC RFI. AMF's AVC/HEVC API has no constrained-intra property (intra-refresh cannot heal; PSNR-proven), so the only clean-recovery lever is user LTR: mark frames as long-term references, and on loss force the next frame to re-reference the newest known-good one — a clean P-frame, not an IDR. Two rotating LTR slots, ~0.5s mark cadence, on by default for AVC/HEVC (PUNKTFUNK_NO_AMF_LTR disables). invalidate_ref_frames picks the newest LTR before the loss; a range older than the live slots falls back to a keyframe. Protocol (punktfunk-core): RfiRequest control message + NativeClient::request_rfi(). Host: RfiRequest dispatch -> invalidate_ref_frames (IDR fallback); an RFI success anchors the keyframe cooldown so the client's frames_dropped echo of the same loss is coalesced away rather than emitting a redundant IDR. Spike: synthetic NV12 GPU source for headless AMF encoder testing. Validated: core rfi_request_roundtrip; pf-client-core 31 unit tests (incl. an_rfi_anchor_lifts_immediately); punktfunk-host builds + 271 tests on Linux; punktfunk-host builds clean on Windows; real AMD iGPU spike (invalidate at frame 90 forced re-reference to LTR frame 60 — 180 frames, keyframes=1, no recovery IDR). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>