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fix(encode/windows): resolve NVENC at runtime — AMD/Intel hosts no longer crash at start

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The nvenc build linked nvEncodeAPI64.dll's entry points at load time, so a
--features nvenc binary hard-crashed on any box without the NVIDIA driver
(AMD/Intel). Entry points now come from a runtime LoadLibrary table
(encode/windows/nvenc.rs load_api); a missing DLL just falls through the
encoder auto-detect to AMF/QSV/software. The generated import lib and all its
plumbing (gen-nvenc-importlib.ps1, nvenc.def, PUNKTFUNK_NVENC_LIB_DIR,
setup-build-env wiring) are gone.

Live-validated on the RTX 4090 box (NVENC session, 7000+ frames).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-07-03 12:09:18 +00:00
parent 95a08e99c3
commit 01fcb01019
9 changed files with 259 additions and 150 deletions
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scripts/windows/README.md
+2 -2
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@@ -9,11 +9,11 @@ Helper scripts for the Windows host box (the RTX `.173` lab box, repo at
powershell -ExecutionPolicy Bypass -File scripts\windows\setup-build-env.ps1
```
Persists (Machine scope) the three vars the NVENC build needs:
Persists (Machine scope) the vars the host build needs (NVENC itself needs none — its entry
points are runtime-loaded from the driver's `nvEncodeAPI64.dll`):
| var | value | why |
| --- | --- | --- |
| `PUNKTFUNK_NVENC_LIB_DIR` | `C:\Users\Public\nvenc` | NVENC import lib (`nvencodeapi.lib`) |
| `LIBCLANG_PATH` | `C:\Program Files\LLVM\bin` | bindgen (`libclang.dll`) |
| `CMAKE_POLICY_VERSION_MINIMUM` | `3.5` | `audiopus_sys` / cmake crates |