Video editing on Linux has, for the expanse of recorded history, sucked eggs. This isn’t a terribly big secret.
Sure, we’ve had a variety of high-end, commercial-grade tools available that we all like to point at - such as Cinelerra (which I still can’t get to run properly) - in order to try to convince ourselves (and others) that the video editing situation on Linux is far less dire than it really has been.
Heck, the major Linux-centric podcasts tend to be recorded and edited on Macs. Even "The Linux Action Show" is recorded, edited and produced entirely on MacOS X. For a time we (meaning myself and my old co-host on that show) tried to simply not talk about that fact. But, eventually, we threw our hands up in the air and declared unto the Internets, "You know what? Linux video editing sucks. Deal with it."
rest here