Terje, I have not been following this thread very closely, but have a couple of comments.

A minor visual notice, why differ the Render button geometries between
my two workstations with the same, latest Cin-GG appimage installation?
See the attached screenshot, the top Render window with square and
round buttons vs the bottom Render window with romb buttons.

Your 2 different workstations have 2 different $HOME/.bcast5 so you must have set one to "S.U.V" and the other to "unflat" in Settings->Preferences, Appearance tab, theme selection in top left hand corner.

@"Manual"
I think it could be useful if it is possible to add some overview
table(s) i.e in the manual section FFmpeg Format Options inside
CINELERRA-GG:
That is, valid and Standard Profiles with Compression and Pixels
properties for actual purposes and media, that works for Cin-GG and
Cin-GG multibit respectively?

Andrea, do you want to add this or should I try?