Memory was definitely exhausted. I had about 100 resource exhaustion detections in the event log, and a few processes had some weird behaviour, which could explain the buffer overruns possibly, although I can’t say I know enough about buffers to know what I’m talking about. I imagine that it got further since Shotcut wasn’t open using an extra GB of RAM, so it could leak for a bit longer before crashing.
Gonna try again with hardware acceleration, although that was causing some other (seemingly unrelated?) issues earlier.
Thanks for your time, and hopefully we can get to the bottom of this soon! If there’s anything I can do to help find the issue, please let me know, although I doubt my C++ is good enough to get me anywhere.