This is link to the script that I use to transcode for roku. The scripts supports various transcoding modes and passing list of files or wildcards on command line. It is a bash script so it can run ether in cygwin (as I use it) or on unix.
You would need to edit it to specify location of your ffmpeg binary. You can also adjust command line parameters to your liking. Parameters in the script work well on my AMD x6 machine. They produce reasonable output in a reasonable time. Any feedback is welcome.
http://dl.dropbox.com/u/58276789/transcode.sh
