user@imacg5:~/Desktop/Leonard Fletcher$ ffmpeg -i videoplayback -vn -acodec libmp3lame -ac 2 -ab 160k -ar 48000 c.mp3
WARNING: gnome-keyring:: couldn't connect to: /tmp/keyring-hNEone/pkcs11: No such file or directory
ffmpeg version 4.1.5 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 4.6 (Ubuntu/Linaro 4.6.4-1ubuntu1~12.04)
  configuration: --enable-gnutls --prefix=/usr
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videoplayback':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2020-09-25T12:34:13.000000Z
  Duration: 01:28:37.90, start: 0.000000, bitrate: 333 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 640x360 [SAR 1:1 DAR 16:9], 234 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2020-09-25T12:34:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 09/25/2020.
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s (default)
    Metadata:
      creation_time   : 2020-09-25T12:34:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 09/25/2020.
Unknown encoder 'libmp3lame'
user@imacg5:~/Desktop/Leonard Fletcher$ sudo apt-get install lame
Reading package lists... Done
Building dependency tree       
Reading state information... Done
lame is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.