The Linux release ffmpeg is built statically from source, and ffmpeg only
autodetects --enable-vaapi when libva headers are present at configure time.
Neither build path installed them, so every release shipped a static ffmpeg
with no h264_vaapi encoder -- the zero-copy export silently fell back to
software 100% of the time.
- Containerfile + build.yml: install libva-dev + libdrm-dev so the from-source
ffmpeg gets VAAPI.
- build.yml: assert the release binary links libva, so a missing dep can't
silently regress to a software-only build again.
- deb/rpm: libva (libva2/libva-drm2/libdrm2, libva/libdrm) is a hard runtime
dep -- the vaapi-enabled ffmpeg DT_NEEDEDs it, so the app won't launch
without it. The VA driver is a soft recommends (absent it, export falls back
to software): va-driver-all (deb), intel-media-driver/mesa-va-drivers (rpm).
build.rs needs no change: releases link ffmpeg statically (its bundling path
is skipped) and the AppImage is thin, taking libva from the host like libvulkan.
Skyler Lehmkuhl