Linux parity, validated by the .173 on-glass A/B (no regression; the win goes
to clients that actually consume slice-progressive parts): the caps probe now
reads NV_ENC_CAPS_SUPPORT_SUBFRAME_READBACK and seeds resolve_subframe with it
instead of a hard false, so PUNKTFUNK_NVENC_SUBFRAME becomes the tri-state
escape it already is on Linux, and the split×sub-frame arbitration hears the
real forced flag for its log severity.
The A/B also caught the default path opening every session with a WARN: the
submit-time idr_hint missed that NVENC emits the session-opening frame as an
IDR regardless of pic flags, so frame 1's early chunks went out unflagged and
the divergence check fired at every start. The hint now carries the Linux
twin's `opening` term.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehlerandClaude Fable 5
4d45a96ff9