movie won't sync to iPhone 3GS?

[penguy]

I have several movies purchased through iTunes, most will sync to my new iPhone, but one will not. I can play it in iTunes and I can sync it to a 1st and 2nd gen touch. any ideas?

 

[VenusianSky]

I too am unable to sync some videos, but I didn't purchase them from the itunes store. They are music videos from my Iron Maiden Enhanced CD's. They are all in Quicktime mov format, but when I tried to sync them to my 3G, it says something like the format isn't supported.