Does inter or intra frame compression camera setting matter if recording externally through HDMI?

[John Matthews]

I actually can't find much info on this, but my camera (Olympus E-M1 ii) has an HDMI out that I'm connecting to a BlackMagic Ultrastudio Mini Recorder. Here are some questions:

1) Would setting the camera to ALL-I have any practical impact on the image recorded? If so, what?

2) Although the Ultrastudio MR only records 1080p 30fps max (and it does it in a weird interlaced way), it also somehow accepts or recognizes a UHD signal, but not the DCI signal (probably not supported). Any ideas for why it accepts the UHD... is it line-skipping? maybe the HDMI signal automatically adjusts... I'm confused.

Does anyone have experience with either of these points?