[anek@archlinux ~]$ ffmpeg -i pub/linaTV.webm /dev/null
ffmpeg version n5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.2.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan
  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 'pub/linaTV.webm':
  Metadata:
    ENCODER         : Lavf59.27.100
  Duration: 00:14:07.12, start: 0.000000, bitrate: 115 kb/s
  Stream #0:0: Video: vp9 (Profile 0), yuv420p(tv, progressive), 512x672, SAR 1:1 DAR 16:21, 25 fps, 25 tbr, 1k tbn
    Metadata:
      ENCODER         : Lavc59.37.100 libvpx-vp9
      DURATION        : 00:01:50.000000000
  Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp
    Metadata:
      ENCODER         : Lavc59.37.100 libvorbis
      DURATION        : 00:14:07.118000000
[NULL @ 0x55c544ba5cc0] Unable to find a suitable output format for '/dev/null'
/dev/null: Invalid argument