won't play .mts videos correctly, no video and no sound

My camera takes videos in .MTS format and whenever I try to play them, they open in Movie Player and the very first second has audio and video, but after that there's to video or sound. I don't understand what the problem is.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: libgstreamer0.10-0 0.10.35-1
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
Uname: Linux 3.0.0-17-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Sun Apr 29 16:50:52 2012
ExecutablePath: /usr/bin/totem
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gstreamer0.10
UpgradeStatus: No upgrade log present (probably fresh install)