enricobuehler
d2b4e3d71c
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The nvenc feature is off by default, and a Linux host built without
--features punktfunk-host/nvenc silently compiles the direct-SDK path out:
a CUDA session degrades to libav hevc_nvenc — no RFI loss recovery, an
encoder rebuild + IDR on every adaptive-bitrate step, and the libav bitrate
clamp — with nothing in the logs saying why. This bit the Linux packagers
once (fixed in e89b2f60) and an ad-hoc host deploy again on 2026-07-14,
where the on-glass Automatic-climb session showed rebuild-per-step behavior
that read as a pipeline gap (it wasn't: the Portal/PipeWire path delivers
EGL-imported CUDA NV12 frames and goes direct whenever the feature is in
the build). One WARN per process, skipped under an explicit
PUNKTFUNK_NVENC_DIRECT=0.
Validated on .21 (GNOME/Mutter Portal capture, feature build): probe session
logs `Linux direct-SDK NVENC`, and probe --rebitrate lands as `encoder
bitrate reconfigured in place (adaptive bitrate — no IDR)`.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>