I have an application where I need to replace a CCTV image on a monitor with a 800x600 computer-generated image at certain times. The CCTV images are usually composite (PAL) video. The easiest way as I see it is to convert the SVGA RGB to PAL using an AD725 or something like that and switch between the two PAL sources.
Most of the screens in use (15" TFT) will take either VGA or composite video either by a separate interface option or a menu, so should handle the non-interlaced video at the higher refresh rates and higher lines-per-field than standard TV systems.
My feeling is this should work, but is there any complication I might've overlooked? Is there a better NG to ask this question?
(This is an embedded PC/104 system, so I don't have the luxury of buying a PC/TV card etc)