Any tutorial for converting HD MKV files to PS3 friendly MP4s that has been written has been criticised for being complicated. This criticism definitely holds true for the majority of users i.e. the command line can be quite overwhelming. Thus, this script is a graphical program implementing the tutorial described here and here.
Please note that this script does not replace the tools that need to be installed as described in those tutorials. What this script does do is use those tools so you don't have to.
These details are provided for information only. No information here is legal advice and should not be used as such.