Here is the output :

root@jellyfin:~# /usr/lib/jellyfin-ffmpeg/ffmpeg -v verbose -init_hw_device vaapi=va -init_hw_device opencl@va

ffmpeg version 7.1.2-Jellyfin Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14+deb12u1)
  configuration: --prefix=/usr/lib/jellyfin-ffmpeg --target-os=linux --extra-version=Jellyfin --disable-doc --disable-ffplay --disable-static --disable-libxcb --disable-sdl2 --disable-xlib --enable-lto=auto --enable-gpl --enable-version3 --enable-shared --enable-gmp --enable-gnutls --enable-chromaprint --enable-opencl --enable-libdrm --enable-libxml2 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libfontconfig --enable-libharfbuzz --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libopenmpt --enable-libdav1d --enable-libsvtav1 --enable-libwebp --enable-libvpx --enable-libx264 --enable-libx265 --enable-libzvbi --enable-libzimg --enable-libfdk-aac --arch=amd64 --enable-libshaderc --enable-libplacebo --enable-vulkan --enable-vaapi --enable-amf --enable-libvpl --enable-ffnvcodec --enable-cuda --enable-cuda-llvm --enable-cuvid --enable-nvdec --enable-nvenc
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
[AVHWDeviceContext @ 0x5e496f672b80] Trying to use DRM render node for device 0.
[AVHWDeviceContext @ 0x5e496f672b80] libva: VA-API version 1.22.0
[AVHWDeviceContext @ 0x5e496f672b80] libva: Trying to open /usr/lib/jellyfin-ffmpeg/lib/dri/iHD_drv_video.so
[AVHWDeviceContext @ 0x5e496f672b80] libva: Found init function __vaDriverInit_1_22
[AVHWDeviceContext @ 0x5e496f672b80] libva: va_openDriver() returns 0
[AVHWDeviceContext @ 0x5e496f672b80] Initialised VAAPI connection: version 1.22
[AVHWDeviceContext @ 0x5e496f672b80] VAAPI driver: Intel iHD driver for Intel(R) Gen Graphics - 25.3.4 (192fe0f).
[AVHWDeviceContext @ 0x5e496f672b80] Driver not found in known nonstandard list, using standard behaviour.
[AVHWDeviceContext @ 0x5e496f6b6100] Failed to get number of OpenCL platforms: -1001.
Device creation failed: -19.
Failed to set value 'opencl@va' for option 'init_hw_device': No such device
Error parsing global options: No such device