I came across what seems to be a great web resource for Audio-Visual
Preservation using FFmpeg cross platform.
This resource is released under a CC BY 4.0 (Creative Commons)
License and provided “as is” without warranty or support of any
kind.
Most of the content is in English, a smaller part in German only
https://avpres.net/
Tutorials (under work)
- Bash Cookbook for Archivists
- FFmpeg Cookbook for Archivists
Especially the latter "FFmpeg Cookbook" seems for me to be a great
tutorial and reference using FFmpeg code syntax.
An example:
Filter image - Pad 4:3 into 16:9
https://avpres.net/FFmpeg/4-3_16-9