Just wanted to give you a heads up.
The Resolution settings in the Main Settings-> Web Server, now works. I just tested it on a profile and viewing a single camera, and I get the right Res.
Yeah, that was a couple of patches ago. Actually Blue Iris ignores the width part and only honors the height. Some of the other encoding parameters still don't work and Ken doesn't seem to care (or at least other things are a higher priority to him).
Only issue there is and not sure if its chrome or UI3, is that when I turn off the resize and view a single 4K camera, I get the you cpu isnt fast enough message. At 1920 x 1080 it works 100% fine.
With BI's "resize output frame" setting turned off, your 4K camera will be streaming at actual 4K resolution, and not a lot of CPUs can keep up with decoding that unless you turn the frame rate way down (which isn't an available control yet). A lot of high-end smartphones struggle to keep up with 720p @ 15 FPS! The reason for this is that UI3 can't access hardware acceleration, and its video decoder is single-threaded and running in JavaScript.