As you know, about camera, there are Sony and Sharp two solution. 
IP camera also have two solution:  ARM7 and ARM9 solution.
ARM7 solution sometimes will appear video lose. Cause its CPU frequency is 50MHz.
So sometime when inner data and out data is very complex, ARM7 CPU is not enough to process,
video lose will appear. On the market most IP camera use ARM7.
 
Our company use ARM 9 Solution. whose CPU frequency is 175MHz, Max can reach 220MHz.