Support for export ffmpeg command-line

[avsc]

so that could use the latest ffmpeg version,
could hand-edit the commands (e.g. use codec options the avidemux's UI not yet support)

[and/or:]

• could still use avidemux while ..


• could have it run in the background seperately


• batch it for later

https://www.ffmpeg.org/documentation.html
arent alot of avidemux's filters ffmpeg-based?
rejoining segments not sure how to.. (involves -ss, -t &.. )

[eumagga0x2a]

Avidemux is not a frontend to a CLI ffmpeg, so almost for sure it won't happen.