I recently used Shotcut on Ubuntu 23.10 and I’m happy with it (apart from some occasional crashes for no apparent reason).
I’m editing some videos shot with a Pixel 7 Pro vertically. I imported the files, the program created the proxies correctly and everything was fine until I did the final file export. The export takes place, but when opening the file it is completely black.
I’ve tried doing a few things like turning off the hardware encoder or adjusting the video format first, but the result is still the same.
I have also noticed (in other videos) that adding an audio track generates some crackling in the sound in correspondence with the video transitions.
After trying to disable proxy files in the current project, I tried again to export the final movie, but again got a black file.
So I created a new project with the original files and in the end I was able to export correctly.
So your suggestion (to work with original files and not proxies) is valid.