Camcorder & File Format

[costaink]

I am having a little problem with the camcorder on my HTC EVO 4g. I have .mp4 selected as the encoder, yet the video always records with a .3gp extension. Plus, the video records sideways. I have a friend with a Samsung Infuse who can't play the .3gp files at all on the phone. They have to do it on their laptop at home.

Is there a way for me to fix this?

Thanks, and have a great day!