[ubuntu] Lost sound for video

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http://ubuntuforums.org – I was watching some MP4 videos, and at some point between two video's, I lost sound. When I started the next video and noticed that I did not have sound for it, I imediately checked my volume and sound settings for the program I was using. I then Checked master volume settings for Ubuntu. So far everything was good. I decided to open the video in VLC, still no sound. So I tried a few other videos of various formats to see if the video itself was the issue... nothing still. Next a played a few songs in banshee, which worked fine, ruling out the loss of all sound all together. I restarted my com (Hardware)