I was wondering what the difference between MPEG-4 and mp4 was. I kept seeing that it was the same thing on websites when i was looking for the answer, yet mp4 videos wont play on my xoom which supports MPEG-4. Any help of what i should do with my mp4 videos? When I try and play my mp4 file it just skims through it real fast and wont play it normally, but the file plays normal on my computer. I converted the video and made it smaller, it stopped skipping but the audio was completely messed up and just made noises. I just got off the phone with moto support because im that bored on this sunday. They told me that mp4 was not a supported format for the xoom, and that MPEG4 is supported. Now im confused..