Somebody has been hacking on some patches for Perian to allow it to playback the "pro codecs" that you normally can't play without Final Cut Studio installed.
So, he is posting four different Quicktime components. These are playback only (no encoding). He chose to break them into separate components so you can pick and choose only what you need. Just put them in your Library/Quicktime folder.
These are, of course, UNSUPPORTED, and may very well leap out of your computer and murder you with an axe. On the plus side, they let you play all those Quicktime files that your Final Cut using friends give you.
So, here we go:
And of course, the source for all of this. This is based on Perian 1.1.3. You'll notice he modified the Xcode project to add separate build targets for each component (plus a few others, not posted here). This allows him to spit out a half dozen different components without having to modify source.
It works for version 1.2.1 as well. Thank you for this.