I'm running Kubuntu Vivid, and have an Nvidia 940GM card on my Inspiron laptop. When using the nvidia-346 driver, VLC plays choppy videos (video seems "pixelized" with green dots appearing).
The situation doesn't happen with the nouveau driver, nor does it happen with other players. How can I fix this? I tried different GPU accelerations and shutting it off (that's what I found after googling) but it doesn't help. I had the same problem running 14.10.
11 Answer
Changing VLC's video output to OpenGL in Preferences → Video worked to fix this problem.
(Thanks to wedu for suggesting to check the available video options. I'm not sure why I hadn't thought of that.)
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