Do you know if IP Cam Viewer is pulling the RTSP full resolution feed from HikVision cameras or is it trying to pull a lower resolution protocol?
I have the Swann SWNHD-820CAM, and the standard 1080p feeds (on ports 554, and 80) seem to lock up my 10" Samsung Galaxy Tab 2. I did notice that the Swann native app, pulls from port 8000, which is a lower resolution feed, but I can't figure out how to pull that same feed on IP Cam Viewer. I believe port 8000 is an SDK protocol feed.
Unfortunately, Swann's native app doesn't support 10" tablets at this time.