FSB version 5

[Carl Eugen Hoyos]

​http://ffmpeg.org/pipermail/ffmpeg-devel/2021-May/280601.html

$ ffmpeg -i rain1.fsb 
ffmpeg version N-102605-g4c705a2775 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      57.  0.100 / 57.  0.100
  libavcodec     59.  1.100 / 59.  1.100
  libavformat    59.  2.101 / 59.  2.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  0.101 /  8.  0.101
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
[fsb @ 0x3ec4580] version 5 is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[fsb @ 0x3ec4580] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
rain1.fsb: Not yet implemented in FFmpeg, patches welcome