MPEG Streamclip and Snow Leopard
If you have you'll see it's missing the MPEG2 component and won't work properly and it's not easy to get back unless you have time machine backups etc.
Here's a cast iron way of restoring it and without installing rosetta which you will encounter if you try installing it from a regular PKG file:
First go to your FCP DVD and right click the installer and 'show the original file' from the shortcut icon:
Find the QuickTimeMPEG2.pkg or QuickTimeProMPEG2.pkg
Right click on the QuickTimeMPEG2.pkg file and choose "Show Package Contents".
Open those folders and drag the one named Archive.pax.gz file to your Desktop.
Double click to expand it and drag the QuickTimeMPEG2.component to your
HD/System/Library/QuickTime folder and restart your machine.
Delete the files and folders made on the Desktop by the Archive.pax.gz file.
Job done, all should work fine now!
24" iMac, 17" Mac Book Pro, Mac Pro Quad Intel Dual Core, Mac OS X (10.5.6), Infortrend 20TB RAID - ATTO Fibre Channel - FCP Certified Pro Trainer