https://www.danieltufvesson.com/makeresolvedeb
DaVinci can’t import the .mkv from OBS so need to use ffmpeg to convert:
https://askubuntu.com/a/195346
ffmpeg -i input.mkv -codec copy output.mp4
You might think it’s a good idea to have OBS output .mp4 but if the recording is interrupted and the mp4 container can’t be finalized the content will be lost. I guess it needs to write some data at the end which affects how the rest of the file is interpreted or something? Apparently the default, .mkv does not have the same problem.
More on that here: https://tielqt.medium.com/should-you-be-recording-to-mp4-with-obs-obs-mythbusters-fc8513851170