MPEG 2 component not installed in Quicktime Pro

My first symptom is: I try to extract a file from a DVD using MPEG Streamclip, and I get a message that says MPEG 2 is not installed in my computer.
But I have Quicktime Pro, Final Cut Pro and Compressor installed in my computer. I have checked the Quicktime folder in the library and the component is there. But when I try to export a file as a MPEG 2 movie either from inside Final Cut using the Quicktime Conversion option or from Quicktime itself, I do not see the MPEG 2 option! Why is this???
Help please!
PS: My DVDs are not protected, they are of my own work!

What I really wanted to do was: import my own videos from DVDs I made, add them to a DVD Sudio Pro project of my work (my digital portfolio) and then burn this project back to DVD - encoding them back to DVD. It was my understanding that in order to work with them in DVD SP, they had to be either .mov or mpeg2.
DVDSP normally expects a conversion compatible QT compression format or MPEG-2 "elementary stream" (i.e. M2V video file referencing a separate AIFF audio file or paired M2V and AC3) files.
Any idea how to fix this?
You may have run up against an upgrade incompatibility. I used to use FCP v4.5 with the then contemporary versions of Compressor and DVDSP. As soon as i upgraded to leopard, my MPEG-2 encoder, Compressor, and DVDSP either failed to work at all or only partially functioned. As I always keep an earlier OS handy on one or more hard drives, I quickly learned these applications still worked when I booted up using Tiger. For several months I continued to work by reverting to Tiger when needing to use the affected applications. In April, I finally "bit the bullet" and purchased a used copy of FCS2 over the Internet. Now everything (except my old MPEG-2 encoder component) works under Leopard. Not sure if this may be the basis for your problems but if you can boot up in Tiger and re-initialize the problem applications, then you can easily test whether or not an OS incompatibility is the root of your problems here.

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