enricobuehler
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The encoder half of sub-frame slice output (latency §7 LN1, planning
design/nvenc-subframe-slice-output.md Phase 1): with PUNKTFUNK_NVENC_SLICES=N +
PUNKTFUNK_NVENC_SUBFRAME=1 on a sync depth-1 session, Encoder::poll_chunk hands
the in-flight AU out as slice-boundary chunks read through doNotWait sub-frame
locks while the tail is still encoding — the readback loop the on-hw probe
validated (~200 µs slice spacing on the 5070 Ti), productionized.
- codec.rs: AuChunk (AU metadata on the first chunk, `last` closes the AU;
chunks concatenate to exactly the poll() bytes) + supports_chunked_poll /
poll_chunk trait surface. Default impl wraps poll() as one self-closing
chunk, so a chunk-driven consumer works against every backend.
- nvenc_cuda: chunked readback cut at slice boundaries only (bitstream size at
n reported slices = end of slice n, Annex-B contiguous); completion is NEVER
numSlices alone — one finishing BLOCKING lock is the authority and the wedge
watchdog, so the final chunk blocks exactly like sync poll (the depth-1 pump
contract; 6dc195f9 bug class). Keyframe on early chunks is the submit-time
IDR prediction (exact under P-only/infinite-GOP), cross-checked at finish.
Debug builds shadow-check emitted chunks against the finished AU prefix.
Mutually exclusive with pipelined retrieve (gated off when async_rt exists,
dropped by the escalation rebuild); composes with stream-ordered submit.
- nvenc_core: slices_env/subframe_requested shared parses so the config author
and the chunked-poll arming can't disagree.
- TrackedEncoder forwards both new methods (the set_wire_chunking trap class).
Host loop untouched — Phase 2 (VIDEO_CAP_STREAMED_AU seal/send) consumes this.
On-hw: nvenc_cuda_chunked_poll_end_to_end + nvenc_cuda_chunked_poll_fallback_whole_au.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>