I am looking for a picture in picture chip that will accept composite video inputs and allow variable sized windowing.
Anyone used one?
Hi, sorry this is not the type of forum to look for that type of IC. This is for arduino users and experimenters.
Try some of the more general electronics forums.
Tom.... 
I will try there, but I am looking to control the pip chip from an adruino...
Hi, I don't think you will find a chip, composite is now old technology, and I'd say that a stand along IC that does that job would not exist.
They would be integrated into a full blown video processing chip, so go good luck.
Tom......
SDA 9086 - SDA 9087 - SDA 9088
I've had a good google about, but looks like most are obsolete now...
Clearly it's all done on a SoC video processor these days. Shame. Maybe someone like Maxim will do one, like they did with the onscreen text chip...