Video gets out of sync partly through broadcast??

localcinematic

New Member
We streamed a performer for about 45 minutes the other day and when reviewing the recording from OBS, about 12 minutes in, the video abruptly stutters and remains about .5 seconds delayed from the audio for the rest of the recording. I have no idea where to even start. Can audio delay be adjusted on the fly? Is this a common problem? I found one thread with 3 years of similar complaints but zero answers.

We were broadcasting to Facebook, and the FB recording stays in sync longer than the OBS recording somehow, but about 4 minutes further into the FB recording, the video also gets out of sync with the audio and remains out of sync for the rest of the show.
We didn't see any complaints from the audience during the show about audio being out of sync but it was only a 30 person audience so who knows if they were just being polite.

Setup is 2 Ursa Mini Pro 4.6k and 1 BMPCC 6K running HDMI out to an ATEM Pro switch running to a Mac Mini. Audio comes from a separate system running XLR into a Yamaha MG 10XU and then USB out to the Mac Mini.
 

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