Hello my good friends

I have been using this script for AGES on Ubuntu, but suddenly, now I am using Linux Mint 13, it throws an error. Here is the script:

Code:
#!/bin/bash

ffmpeg -f alsa -ac 1 -ab 192k -i pulse -acodec pcm_s16le -f x11grab -r 15 -s 1280x1024 -i :0.$1 -r 15 -s 1280x1024 -sameq -aspect 5:4 -vcodec libx264 -vpre lossless_ultrafast -threads 0 $2.mkv
Here is the error message I see, when I run './screencast 0 output' :

Code:
Unrecognized option 'preset'
/usr/share/avconv/libx264-lossless_ultrafast.avpreset: Invalid option or argument: 'preset=ultrafast', parsed as 'preset' = 'ultrafast'
Does anyone know what the issue I am seeing, is?

Thank you!