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The Windows direct-NVENC session gets the Linux backend's sub-frame chunked poll: a doNotWait sampling lock cuts each completed slice out of the bitstream while the frame is still encoding, so the send loop's streamed slice wire starts shipping an AU's front before its tail exists. The default retrieve mode on Windows is synchronous, which is exactly the mode the sampler requires - the async opt-in keeps its whole-AU path and the chunked latch drops away when it is active. The session's slice count now honors the negotiation instead of pinning one: the direct-NVENC default of 4 clamped by the client's ceiling, so a single-slice client (Amlogic-class decoders that never advertised multi-slice) keeps today's wire shape and a multi-slice client gets real boundaries to cut at. The pending queue carries a submit-time IDR hint because an AU's early chunks ship before the driver reports the picture type; sub-frame write itself stays env-gated (PUNKTFUNK_NVENC_SUBFRAME=1) until the Windows on-glass A/B validates it. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>