FFmpeg Video Only

#!/bin/bash
#Filename:screencast.sh
#Released under a GPLv3 Licence by Clockwork PC

rm -f ~/Videos/Screencasts/output.mkv &&

ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 30 -s 1920x1080 -i :0.0 -acodec pcm_s16le -vcodec libx264 -vpre lossless_ultrafast -threads 0 ~/Videos/Screencasts/output.mkv

ffmpeg -i ~/Videos/Screencasts/output.mkv -acodec libfaac -ab 128k -ac 2 -vcodec libx264 -vpre slow -crf 22 -threads 0 ~/Videos/Screencasts/screencast_on_$(date +%F_%A_at_%H:%M:%S).mp4

exit