This specifically applies to macOS Screen Capture sources freezing, not recordings on any platform.

Further, it's an inexplicable issue with the API; any consumer of SCK is vulnerable to the issue. I'd regard it as Apple's issue to fix, since there is no good reason for frames to randomly stop streaming just because you have less than ~40 GB of disk space free.

Any solution on the OBS side that tried to detect a frozen stream and restart it would not only be a hack and quite possibly lead to greater issues, but could also have privacy implications if we cannot positively identify that the stream was not stopped intentionally (which we cannot).