Updated file presets

I'm currently using x264 for the video since youtube uses x264
internally (I think) and I don't want the video loss-fully
cross-encoded. I'm using the ultrafast preset so my computer doesn't die
while recording and playing minecraft.

The audio is set to flac since it's lossless. I don't believe audio
encoding is going to be a problem size-wise nor cpu power wise. I should
probably have an easier way of changing this instead of hard coding the format.