I am the school laptop custodian and we are irritated because I can't play .mp4 files on rhtymbox.. I have Ubuntu 13.10 32bit
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rhythmbox is a music player. For mp4 use mplayer, VLC or smplayer.
Rhythmbox is mostly for music. As stillblue says use a video player such as VLC for mp4. Also make sure "ubuntu restricted extras" package is installed. You can install with one click from the software center.