Regarding Pitivi I have to confirm that. I tried it multiple times on a novice-level (just cutting and accelerating). Unreliable and crashing, both on AMD and Intel. The quality of encoded result is also bad, even with H265 and highest quality. And the preview window is always “popping” out and doesn’t went back into the main UI. Is it me or are others more successful with it?

I wonder if and how much Gstreamer is responsible for situation.

I’m honestly more apt to ffmpeg. MPV and Celluloid work always reliable. Firefox probably had also a reason to prefer ffmpeg. I will try another editor in future, maybe it is not Gstreamer but Pitiv.