FFMPEG libraries vendored from PyNv Jenkins (FFmpeg 9.0.1, demux/mux only, LGPL).
libavcodec is statically embedded in libavformat / avformat-*.dll.
No standalone libavcodec runtime.

Linux x86_64  -> lib/x86_64
Linux aarch64 -> lib/aarch64
Windows x64   -> lib/x64
Windows ARM64 -> lib/arm64
Headers       -> include (shared)
Source        -> src/ffmpeg-9.0.1.tar.xz
