Using 2.6 r7732 on Apple OSX, I think ADM_fileio.cpp may need adjusting so Avidemux can find pluginSettings.
I've seen main.cpp do this:
Quote from: eumagga0x2a on April 13, 2018, 07:22:45 AM
>8>8 Anything older than 2.7.0 is EOL and unsupported. Any fixes go only into the git master from which nightlies are built.
Nightly builds: https://avidemux.org/nightly/
ps.:
End
Of
Life