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The session pump's depth-1 loop (capture → submit → poll) treats a poll()
None as "the backend holds the frame internally, re-poll next tick" —
true only of the libav AMF/QSV wrappers, whose codecs genuinely hold ~2
frames. The Vulkan Video backend probed its slot fence with
get_fence_status instead, so the AU of every frame — finished on the
ASIC in ~5 ms — sat unharvested until the tick AFTER the next frame was
submitted: encode_us read as one full frame period (~17 ms at 60 Hz vs
VAAPI's ~5.3 ms on the same VCN, the AMD field report) and every frame
shipped a frame period late — one frame of avoidable glass-to-glass
latency on the path that exists to beat libav VAAPI.
Wait the oldest in-flight slot's fence in poll() instead, matching the
sync NVENC backend's blocking lock_bitstream and the documented
Capturer::pipeline_depth contract ("capture → submit → poll-blocks").
Bounded by ENCODE_FENCE_TIMEOUT_NS like enqueue()'s backpressure wait,
for the same reason: poll runs on the thread the stall recovery runs on,
so a wedged GPU must surface as an error, not park it. None now only
means "nothing submitted". Covers H265 and AV1 (shared poll).
Verified: cargo check + DPB/RPS unit tests green (home-worker-5); the
GPU smoke tests fail at session open on that box's NVIDIA driver
identically on unmodified origin/main — pre-existing, needs the RADV
box for on-glass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>