The sys crate's `static` feature copies the archives at BUILD time and cargo does not track archive changes: after rebuilding the project FFmpeg every binary silently keeps the previous objects until `cargo clean -p ffmpeg-sys-next` (observed: an NVDEC-capable rebuild never reached the binaries; av_hwdevice_ctx_create(CUDA) then failed with ENOMEM because the old hwdevice table had no CUDA entry).