How to import MP4 to Final Cut Pro for further editing？

"I've had issues dealing with a few video files I've gotten as handouts at press conferences.Both were named as .mp4 files, under "get info" they're in a h264 AAC codec.When I import it into FCP and try to play it, I get an error message saying "General Error", and then "Error, Out of Memory".- from Creativecow forums.