args = ['ffmpeg', '-i', fname,
	'-preset', 'fast', #change this
	'-threads', '0', #use all available cores
	'-vcodec', 'libx264',
	'-crf', '33', '-maxrate', '400k', #quantizer scale, 0-51; 18 lossless, 51 lossy(+6=~half bitrate)
	'-ar', '22050',
	'-f', 'flv',
	'rtmp://live.twitch.tv/app/' + stream_key]