~/Videos $ ffplay -vcodec h264_v4l2m2m [\Yameii]\ Made\ in\ Abyss\ -\ The\ Golde
n\ City\ of\ the\ Scorching\ Sun\ -\ 11\ \[English\ Dub]\ \[WEB-DL\ 1080p]\ \[96
C04DA4].mkv  > ffplay_h264_v4l2m2m.txt
ffplay version 5.1.2 Copyright (c) 2003-2022 the FFmpeg developers
  built with gcc 12.2.1 (Alpine 12.2.1_git20220924-r4) 20220924
  configuration: --prefix=/usr --enable-avfilter --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libjxl --enable-libpulse --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-libdav1d --enable-lto --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --enable-librist --enable-libsrt --enable-libssh --enable-libvidstab --disable-stripping --disable-static --disable-librtmp --disable-lzma --enable-libaom --enable-libopus --enable-libsoxr --enable-libwebp --enable-vaapi --enable-vdpau --enable-vulkan --enable-libdrm --enable-libzmq --optflags=-O2 --disable-debug
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, matroska,webm, from '[Yameii] Made in Abyss - The Golden City of the Scorching Sun - 11 [English Dub] [WEB-DL 1080p] [96C04DA4].mkv':
  Metadata:
    encoder         : NULL
~/Videos $ ffplay -vcodec h264_v4l2m2m [\Yameii]\ Made\ in\ Abyss\ -\ The\ Golden\ City\ of\ the\ Scorching\ Sun\ -\ 11\ \[English\ Dub]\ \[WEB-DL\ 1080p]\ \[96C04DA4].m
kv
ffplay version 5.1.2 Copyright (c) 2003-2022 the FFmpeg developers
  built with gcc 12.2.1 (Alpine 12.2.1_git20220924-r4) 20220924
  configuration: --prefix=/usr --enable-avfilter --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libjxl --enable-libpulse --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-libdav1d --enable-lto --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --enable-librist --enable-libsrt --enable-libssh --enable-libvidstab --disable-stripping --disable-static --disable-librtmp --disable-lzma --enable-libaom --enable-libopus --enable-libsoxr --enable-libwebp --enable-vaapi --enable-vdpau --enable-vulkan --enable-libdrm --enable-libzmq --optflags=-O2 --disable-debug
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, matroska,webm, from '[Yameii] Made in Abyss - The Golden City of the Scorching Sun - 11 [English Dub] [WEB-DL 1080p] [96C04DA4].mkv':
  Metadata:
    encoder         : NULL
  Duration: 00:24:34.55, start: 0.000000, bitrate: 2914 kb/s
  Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn (default)
    Metadata:
      title           : HIDIVE WEB-DL
      BPS-eng         : 2752803
      DURATION-eng    : 00:24:34.473000000
      NUMBER_OF_FRAMES-eng: 35352
      NUMBER_OF_BYTES-eng: 507366882
      _STATISTICS_WRITING_APP-eng: mkvmerge v45.0.0 ('Heaven in Pennies') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2022-11-09 16:31:22
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1(eng): Audio: aac (LC), 48000 Hz, stereo, fltp (default)
    Metadata:
      title           : English Dub
      BPS-eng         : 159385
      DURATION-eng    : 00:24:34.551000000
      NUMBER_OF_FRAMES-eng: 69124
      NUMBER_OF_BYTES-eng: 29377702
      _STATISTICS_WRITING_APP-eng: mkvmerge v45.0.0 ('Heaven in Pennies') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2022-11-09 16:31:22
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:2(eng): Subtitle: ass (default)
    Metadata:
      title           : English Signs
      BPS-eng         : 9
      DURATION-eng    : 00:22:41.840000000
      NUMBER_OF_FRAMES-eng: 32
      NUMBER_OF_BYTES-eng: 1555
      _STATISTICS_WRITING_APP-eng: mkvmerge v45.0.0 ('Heaven in Pennies') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2022-11-09 16:31:22
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
[h264_v4l2m2m @ 0xffff78f26260] Could not find a valid device
[h264_v4l2m2m @ 0xffff78f26260] can't configure decoder
Switch subtitle stream from #2 to #-1B vq=    0KB sq=    0B f=0/0   
   3.92 M-A: -0.000 fd=   0 aq=15321KB vq=    0KB sq=    0B f=0/0