[FFmpeg-user] ffmpeg with vulkan and or opencl

[owen s]

I have installed opencl and vulkan drivers on linux: Linux
5.8.0-7630-generic #32~1609193707~20.10~781bb80-Ubuntu SMP Tue Jan 5
21:29:56 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

I am using ffmpeg version:
ffmpeg version 4.3.1-4ubuntu1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10 (Ubuntu 10.2.0-9ubuntu2)

I am running this ffmpeg command
ffmpeg -y -hwaccel any \
-loop 1 -framerate 30 -re \
-hwaccel dxva2 \
-i ./1280x720.jpg \
-stream_loop -1 -re \
-i ./audio.mp3 \
-vcodec libx264 -pix_fmt yuv420p \
-b:v 2500k -maxrate 2500k -bufsize 10000k \
-preset slow -tune stillimage \
-b:a 128k -ar 44100 -ac 2 -acodec aac \
-af "dynaudnorm=f=150:g=15" \
-g 60 \
-f flv tmp.flv

This is the output error:
ffmpeg version 4.3.1-4ubuntu1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10 (Ubuntu 10.2.0-9ubuntu2)
  configuration: --prefix=/usr --extra-version=4ubuntu1
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
--disable-stripping --enable-avresample --disable-filter=resample
--enable-gnutls --enable-ladspa --enable-libaom --enable-libass
--enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio
--enable-libcodec2 --enable-libdav1d --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi
--enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame
--enable-libmysofa --enable-libopenjpeg --enable-libopenmpt
--enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg
--enable-librubberband --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh
--enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq
--enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl
--enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-libmfx
--enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc
--enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Multiple -hwaccel options specified for stream 0, only the last option
'-hwaccel dxva2' will be used.
Input #0, image2, from './1280x720.jpg':
  Duration: 00:00:00.03, start: 0.000000, bitrate: 46423 kb/s
    Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc,
bt470bg/unknown/unknown), 1280x720 [SAR 72:72 DAR 16:9], 30 fps, 30 tbr, 30
tbn, 30 tbc
Input #1, mp3, from './audio.mp3':
  Duration: 00:49:57.42, start: 0.025057, bitrate: 128 kb/s
    Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : LAME3.99r
    Side data:
      replaygain: track gain - 13.000000, track peak - unknown, album gain
- unknown, album peak - unknown,
Device creation failed: -12.
[mjpeg @ 0x56112782f480] No device available for decoder: device type dxva2
needed for codec mjpeg.
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (mp3 (mp3float) -> aac (native))
Device setup failed for decoder on input stream #0:0 : Cannot allocate
memory

====
I cannot get ffmpeg to work, do I need to build a special version?
the wiki page: https://trac.ffmpeg.org/wiki/HWAccelIntro

doesn't provide very detailed info.