The following done with putty or ssh on my test server with 2gb ram and the Orbit AF cam resulted in 640x480 with no issues at all.
echo 268424446 >/proc/sys/kernel/shmall
echo 268424446 >/proc/sys/kernel/shmmax
To change them permanently you will need to edit /etc/sysctl.conf and add the following lines (for example) :-
kernel.shmall = 268424446
kernel.shmmax = 268424446
I have some new updates coming that will really change the way the current DVD works and offer all kinds of new features.
Here is just a few,
*Firmware builder for Wireless Mesh Router Cams
*Web interface for custom shared memory options, like I mention above
*Online hearbeat moniter for ip camera's or router's
*Remote desktop with nxclient, access your desktop from anywhere
*Tweak the update feature I keep talking about,

*Presets/control module for Orbit AF cam using remote mjpg_streamer