[ubuntu] Video playback is slow-motion and sound on/off

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http://ubuntuforums.org – I've been Google-ing this issue to death. Have crashed my system a few times and had to do re-installs ](*,) My problem is as follows (I hope it makes sense): I have a Samsung Galaxy Note 3 and takes heaps of photos and videos on it. Then I have a HP Pavilion dm1 Notebook with Ubuntu 13.10 on. The photos taken on the SG work just fine with Ubuntu. It's the video that's driving me insane. Playback on Google+ and YouTube is just fine. But on the laptop it all goes to bits. I've tried using SMPlayer, VLC, Videos but it just doesn't work properly. In some the sound works just fine, in others the (Hardware)