The only solution that worked for me was to remove gstreamer0.10-plugins-bad - then I could play mp4s, and they thumbnailed ok. Unfortunately, this also nixed minitube (which was not working well either).
Solution found here: http://askubuntu.com/questions/126030/totem-not-playing-certain-videos-in-12-04
The only solution that worked for me was to remove gstreamer0. 10-plugins- bad - then I could play mp4s, and they thumbnailed ok. Unfortunately, this also nixed minitube (which was not working well either).
Solution found here: askubuntu. com/questions/ 126030/ totem-not- playing- certain- videos- in-12-04
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