do not require pulseaudio

[aep]

some people dont use pulse. add an option to set to alsa.

also set keyframe delay to 2 seconds.

[wargio]

why the key frame? it's already there

[aep]

key frame delay and framerate are not the same. i dont understand why the existing code will set kreyframedelay to twice the framerate. that would mean i have to set FPS to 1 to set -g to 2, as required by twitch.