My local recording converted but freezes on a single frame midway through recording

I was in a 1hr40min meeting, recording locally. After the meeting I converted successfully to MP4 files.

But, the mp4 freezes about 70 minutes in and all audio + video stop.

Can I attempt to re-convert these files? How?

What are my options to attempt to get a proper download/conversion of these files? This was a HUGE meeting. I absolutely need this.

We had no internet issues, I was hard wired in to ethernet. No error notifications.