> ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 30 -s 1920x1080 -i :0.0 > -acodec pcm_s16le -vcodec libx264 -preset ultrafast -crf 0 -threads 0 > output.mkv Did you try other presets? What if you just play it in ffplay does it look good? -r