I work with this as a recording setup: Canon 5D3 into an ATEM MINI recorder into Ecamm Live (primarily for the sake of bypassing the 30 minute limit at present, not for live-streaming), but eventually uploaded to YouTube.
I've been recording to the 1080p setting, but I'm concerned that my files are too compressed to start with, giving fairly poor quality on YouTube after export.
Ecamm Live has an option to record to a 2160p 4K resolution, which of course gives larger files sizes with higher bitrates.
Is this going to improve the quality of the image being recorded, where the clean HDMI input from the 5D isn't changing, i.e. is the higher bitrate going to produce a more uncompressed image than just recording to 1080? Or is it simply making a pixel of the same quality take up the space of 4?
Perhaps would uploading the final version in 4K to YouTube help improve the image?
Or is YouTube's compression such that there's not much I can do?