Frame Rate Issue - ATEM Mini Pro ISO

Hope you guys can help...

We had three cameras set to 24fps feed into our ATEM Mini Pro ISO via HDMI, and recorded onto a SanDisk SSD.

A setup we've used many, many times before.

When we'd finished and looked at the footage, each of the individual camera files came back at either 18 or 19fps. Not just that, but in some places the videos freeze completely for short while, as if frames are missing completely, so using optical flow doesn't even fix things.

We can't work out how or why. We used the same hardware as we have done countless times before with no issue.

I've just set everything up again using the same equipment, same cameras, same HDMI cables - and it's come back fine.

We're using these professionally so I need to know how and why this happened to stop it from happening again and ruining client recordings.

Has anyone else experienced this and can shed some light on it?

Please let me know if I've omitted any details you need - this is my first post.

Sorry to bump but I can't believe this isn't an issue anyone else has faced?

I had a problem when connecting my Sony FX3 at 23.9 fps and my older Canon 80D DSLR at 23.9 to the ATEM Mini pro ISO. I contacted Black magic design about this. The Canon 80D has a mini HDMI port. So I had to use a small adapter to go from mini HDMI to standard HDMI. that could be the problem. At least, that’s what blackmagic design mentioned to me. But, more importantly, they also said that slower frame rates like 24 FPS or 23.98 FPS might be what’s causing problems. The footage would appear on the monitor very choppy, and also, since it was a blackmagic ATEM mini pro ISO, the recorded footage on the SSD drive was also choppy. Mainly the Canon input footage was choppy. The Sony seemed to be OK. But customer service at Blackmagic design mentioned trying to set up everything at 30 FPS, or actually 29.98, I’m going to try that tomorrow. Evidently the ATEM works better with higher frame rates. I was using 24 FPS or 23.98 FPS to get more of a film look. But I’ll see what happens when I use a slightly higher frame rate. I’m also gonna change the adapter cable for the canon 80D. We’ll see what happens.

Surprised I can't find info on frame rate issues. I'm getting choppy footage, probably dropped frames, when I use my Sony FX3 and Canon 80d with my Atem mini pro ISO. And I didn't see anything in the user manual about how to set the Atem’s frame rate. I think the problem might be that I'm trying to record at 23.976 fps on the Atem but I think the Canon 80’s HDMI out is always a fixed 1080p but at 60 fps. I wanted 23.976 for that “film look” . I guess I'll have to try setting everything to 1080p 60 fps. Anyone have any insights? And could this be related to how hot the Atem gets? Thanks