I set the path to have mencoder in it as well all execute from the same directory. It makes it past the first block "Failed to get movie info: $@\n";" but fails when parsing the info. Keep in mind perl isn't something I do so newb alert.

I notice set dest to nul: but don't see you use it plus I havent a clue what the 2 is for at the end

I use those settings but not being a perl man I thought I might/probably have missed one of the params being pushed.