Anykeeper
I have the following line in /etc/modprobe.d/bttv.conf
options bttv card=131,131,131,131,131,131,131,131
I have 8x131 as I have 2 cards which I think is a WDT 2116. which gives me 16 inputs.
In order to setup my monitors I have the first one on the device /dev/video0 with the channel as 0. The 2nd monitor I've setup as /dev/video1 with the channel as 1. I did set both on the device /dev/video0 (channels 0 & 1 respectively) but this slowed but the fps and I only use 7 inputs so seemed better to have each set on it's own device.
As for the other settings I have V4L2, PAL & BGR24 (NOT RGB). the width and height seemed to go up quite high but I set to 352 x 288. The machine handles it better and going larger didn't seem to improve quality.
The only other thing in the main options under config I un ticked STRICT_VIDEO_CONFIG.