I used several HDSDI cameras, and a single HDCVI PTZ camera mounted about 150 feet from the stage. I used a DH-TP2105 to convert the signal into HDMI and then fed that into a frame rate converter (output was 60 frames, all other cams were @ 1080p25) then into a blackmagic 4K switcher along with the four other hdSDI cameras, You can see the results here http://carnavalmiami.tv.
My question is: there was a bit of a delay from the HDCVI, I am trying to see if that was due to the frame rate converter or if it is inherent in HDCVI, with usual applications the slight delay would not be an issue but with several cameras and music it is.