Hi. I have been happily outputting 4k 60 fps to an HDMI recorder. Now I have an SD card that can record XF-AVC.

When internal priority is set to record XF-AVC, is the output to HDMI identical to the HDMI output when recording "external only?"

I ask because XF-AVC is compressed and I am guessing HDMI "only" is uncompressed (though not raw). So does the camera output two different formats at once (compressed to SD and uncompressed to HDMI) if internal priority is set and a recorder is connected to the HDMI?

Okay I'll take a guess and maybe someone will correct me.

The HDMI output is always the same regardless of recording priority set. So... it is possible to have XF-AVC and Apple ProRes (via recorder) from the same footage.

The HDMI sourced ProRes quality is identical whether or not the camera is also writing XF-AVC to an SD card at the same time.

Well I thought this was a good question. Maybe not...

The HDMI output changes when set to HDMI only to 4:2:2 10 bit.
The HDMI output when set to internal priority is 4:2:2 8 bit.
Download the latest manual 1.03 and go to page 109
Hope this helps