I'm on Arch Linux with these packages installed from the extra repo:
2 extra/avidemux-cli 2.8.1-8 (5.4 MiB 18.7 MiB) (Installed)
Graphical tool to edit video (filter/re-encode/split)
1 extra/avidemux-qt 2.8.1-8 (2.3 MiB 12.4 MiB) (Installed)
Graphical tool to edit video (filter/re-encode/split) - Qt GUI
When I start Avidemux the window briefly appears and then disappears 0.1 second later and the program exits. I used to be OK because I used it before, but presumably with a newer version something is going wrong?
please start it from a terminal, and post the error message.