Both backends' build_init_params authored an identical NV_ENC_INITIALIZE_PARAMS
(P1/ULL preset, PTD, session dimensions/rate, split-encode mode) — the only
difference was the Windows-only enableEncodeAsync flag (Linux is sync-only).
Hoist it to nvenc_core::build_init_params(codec_guid, w, h, fps, cfg, split_mode,
enable_async); Linux's two call sites pass enable_async=false (the field stays 0
as before), Windows passes its session_async through. Keeps open and in-place
reconfigure presenting the SAME init params, now guaranteed identical across
platforms too.
Verified on BOTH platforms: Linux clippy 0/0 (nvenc,vulkan-encode,pyrowave, RTX
5070 Ti) and Windows clippy 0/0 (nvenc,amf-qsv, RTX 4090 / .173).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehler
5748706631