ffmpeg \
-hwaccel vaapi \
-hwaccel_device /dev/dri/renderD128 \
-hwaccel_output_format vaapi \
-i /dev/video2 \
-vf "scale_vaapi=format=nv12" \
-c:v hevc_vaapi output.mp4 -y


ffmpeg version 4.4.2 Copyright (c) 2000-2021 the FFmpeg developers
  built with FreeBSD clang version 13.0.0 (git@github.com:llvm/llvm-project.git llvmorg-13.0.0-0-gd7b669b3a303)
  configuration: --prefix=/usr/local --mandir=/usr/local/man --datadir=/usr/local/share/ffmpeg --pkgconfigdir=/usr/local/libdata/pkgconfig --disable-static --disable-libcelt --enable-shared --enable-pic --enable-gpl --enable-avresample --cc=cc --cxx=c++ --disable-alsa --disable-libopencore-amrnb --disable-libopencore-amrwb --enable-libaom --disable-libaribb24 --enable-asm --enable-libass --disable-libbs2b --disable-libcaca --disable-libcdio --disable-libcodec2 --enable-libdav1d --disable-libdavs2 --disable-libdc1394 --disable-debug --enable-htmlpages --enable-libdrm --disable-libfdk-aac --disable-libflite --enable-fontconfig --enable-libfreetype --enable-frei0r --disable-libfribidi --disable-gcrypt --disable-libglslang --disable-libgme --enable-gmp --enable-gnutls --enable-version3 --disable-libgsm --enable-iconv --disable-libilbc --disable-libjack --disable-libklvanc --disable-libkvazaar --disable-ladspa --enable-libmp3lame --disable-liblensfun --disable-libbluray --disable-librsvg --disable-librtmp --enable-libxml2 --disable-lto --disable-lv2 --disable-mbedtls --disable-libmfx --disable-libmodplug --disable-libmysofa --disable-nonfree --disable-openal --disable-opencl --disable-opengl --disable-libopenh264 --disable-libopenjpeg --disable-libopenmpt --disable-openssl --disable-libopenvino --enable-optimizations --enable-libopus --disable-pocketsphinx --disable-libpulse --disable-librabbitmq --disable-librav1e --disable-librist --enable-runtime-cpudetect --disable-librubberband --enable-sdl2 --disable-libsmbclient --disable-libsnappy --disable-sndio --disable-libsoxr --disable-libspeex --disable-libsrt --disable-libssh --enable-libsvtav1 --disable-libtensorflow --disable-libtesseract --disable-libtheora --disable-libtwolame --disable-libuavs3d --enable-libv4l2 --enable-vaapi --disable-vapoursynth --enable-vdpau --disable-libvidstab --enable-libvmaf --enable-libvorbis --disable-libvo-amrwbenc --enable-libvpx --disable-vulkan --enable-libwebp --enable-libx264 --enable-libx265 --disable-libxavs2 --enable-libxcb --disable-libxvid --disable-outdev=xv --disable-libzimg --disable-libzmq --disable-libzvbi
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, video4linux2,v4l2, from '/dev/video2':
  Duration: N/A, start: 1661977064.943796, bitrate: N/A
  Stream #0:0: Video: mjpeg (Baseline), yuvj422p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 60 fps, 60 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> hevc (hevc_vaapi))
Press [q] to stop, [?] for help
[hevc_vaapi @ 0x80f41fe00] No quality level set; using default (25).
[hevc_vaapi @ 0x80f41fe00] Driver does not support some wanted packed headers (wanted 0xd, found 0x1).
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: hevc (Main) (hev1 / 0x31766568), vaapi_vld(pc, bt470bg/bt470bg/smpte170m, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 60 fps, 15360 tbn
    Metadata:
      encoder         : Lavc58.134.100 hevc_vaapi
frame= 1136 fps= 60 q=-0.0 Lsize=   15134kB time=00:00:18.91 bitrate=6553.8kbits/s dup=1 drop=0 speed=   1x
video:15128kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.037350%
Exiting normally, received signal 2.