This sounds similar to my problem. I've been using smplayer to watch
videos, and it will randomly pause. I have to use the arrow keys to skip
back and forth in order to get it to continue playing.
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random pauses released by pressing a key
https://bugs.launchpad.net/bugs/438196
You received this
After some experimentation, I think I've figured out it's not mplayer itself
that causes this.
I've also had similar pauses from vlc and totem which led me to try various
settings in compiz without success, then killing compiz.real completely and
running mplayer without a window manager.
I had
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/32621459/Dependencies.txt
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random pauses released by pressing a key
https://bugs.launchpad.net/bugs/438196
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ub