Add GPU select to global options

[Erosion139]

Feature details

Hello, I have two GPU's and oftentimes enjoy being able to dedicate the weaker one to background render tasks. I often do this with my video editor and have done so using Nvidia Control Panel to force openGL and CUDA tasks to the secondary GPU. However, I have attempted to restrict handbrake and vidcoder to use the secondary GPU for OpenGL and CUDA tasks and the primary GPU is still taxed. I assume this is because I am missing an option in control panel to select a decode and encode GPU and cannot make the choice. But I believe that for some people being able to select a secondary background rendering GPU would be beneficial especially because for really long encodes that you want to be GPU accelerated it would be nice to have the primary GPU still available for other tasks. :)

[Erosion139]

Never mind, you can add this in the additional settings by using gpu=1

Just need to remember to add : between every setting without spaces.

example: blah:gpu=1

Now it works and I am happy.