How come my iPhone won't play videos?

I'm currently running 6.1 iOS and I've seem to keep getting an error saying "playback error" and I have jail broken my phone if that effects anything but it shouldn't because it has worked great until the other day. Please anything will help

If you have the iPhone 5 and the my3g tweak, remove that tweak it worked for me.

Restart your device. -- It will solve the playback error.

-http://productforums.google.com/forum/#! Topic/youtube/D3I9DJAzOv0

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