Has anyone ever tired putting a video file like an mpeg4 file on there digital camera? i know that new?

samsung camera NV3 has like a movie player but any camera should be able to play be a movie or video as long as its in the right format for that particular camera. im gonna try to do this with my olympus stylus 710 camera or is it not possible? any advice would be great thanks star trek rocks:)

The NV3 can record/ play MPEG-4 TVD at 720x480 at 20 fps and VGA 640x480 at 30 fps. You can even hook up the NV3 to an external speaker. That's one geeky camera! I like it!
The Olympus Stylus 710 only records VGA at 15 fps (QuickTime format, using the M-JPEG codec) It has built in speakers, so you should be good to go at those settings. Just convert your movies into that format, copy them into the proper folder on your memory card, and pop it in the camera.
There are no guarantees however - and there's no reason to assume - that you can also play back video at a higher frame rate or in a different format. The cameras firmware probably wouldn't know what to do with mpeg4, for example. Give it a try though!

please check the manual
it may be by default

usually
a camera will not except the movie
unless if it was taken with that camera