How to put videos on iPhone 4?

I have videos from my video camera that i uploaded to my laptop and i'd like to watch on my iphone but every time i try to add them on to my iphone from itunes it keeps giving me an error message saying it can't be played on iphone… Does anyone know how i can put them on?

The format the video is in is unsupported by the iPhone 4. Convert the file into a format which the iphone supports.

If your video is already mp4 video, you can import the mp4 video into iTunes at first. Connect your iPhone to computer through USB cable, iTunes will recognize the iPhone automatically, and then go to iTunes menu 'File -> Sync iPhone', the video will be transferred to iPhone. If your video is not iPhone compatible mp4 video, you can follow this step by step guide to convert and sync the video to your iPhone, it's easy to understand and works pretty well for me.