@davidrevoy Since the moov is missing, there is little hope i'm afraid. If you can record another video with the *exact* same settings, you can try to use untrunc https://github.com/anthwlock/untrunc

For future reference, you can configure obs to record MP4s that are more resilient against crashes. https://obsproject.com/forum/resources/how-to-fix-mp4-mov-files-corrupting-when-obs-studio-crashes.1293/