Sorry for the late reply, Linden. I got a little busy at the beginning of the Semester.
Andrew confirmed it, but yes...at 83 minutes and 17 seconds the file splits every time for us. H.264 and 720p. Fortunately, the event (College Commencement exercises) I was testing it on for duplication type purposes, was only 74 minutes...so I got lucky this time. This semester commencement will be longer, so yeah...not a viable option really. It still named the file: 'Blackmagic Duplicator 4K [0000].mp4' Really not great for Grandma wanting a copy of her Granddaughter's Graduation.
We also wanted to use it to record sporting events and hand the SD card off to opposing team coaches right after the game ...who need to get a copy of the game according to our conference rules. They aren't really any better audience than grandma for the split file and generic name.
So, it's just not good. I hope a patch or something will...fix it or something. I'm probably delusional.
Great idea, but fumbled it at the end...