Squared 5 – MPEG Streamclip video converter for Mac OS X. This is some excellent information if you need to configure MPEG-2 in Lion. Thanks Squared5!
The Snow Leopard upgrade DVD released on August 28, 2009 may wipe the content of the /System/Library/QuickTime folder during the upgrade process, and delete your MPEG-2 Playback Component installed in that folder. To use MPEG-2 files with MPEG Streamclip you have to reinstall the MPEG-2 component or restore it from a backup copy.
If you are going to upgrade to Snow Leopard
Open the /System/Library/QuickTime folder and drag the QuickTimeMPEG2.component file to your desktop to make a copy of it. Then upgrade to Snow Leopard. When the upgrade is complete, open the /System/Library/QuickTime folder again and move the QuickTimeMPEG2.component file from the desktop to the /System/Library/QuickTime folder (enter your administrator password if necessary).
If you already upgraded to Snow Leopard
You have to reinstall or restore your MPEG-2 Playback Component.
If you have a Time Machine backup of your System folder, then open the /System/Library/QuickTime folder, enter Time Machine and go back in time until you see the QuickTimeMPEG2.component file; select that file and then click Restore.
If you purchased the MPEG-2 Playback Component from the Apple Online Store, then you probably still have the DMG file that contains the installer. Use Spotlight to search for “QuickTimeMPEG2.dmg”: if you find a file with that name, double-click it and then in the disk image, double-click the installer package for Intel Macs.
If you purchased the MPEG-2 Playback Component from the Apple Online Store but you can’t find the QuickTimeMPEG2.dmg file, you can download the file again from the Apple Online Store if you remember the Apple ID used when you originally purchased it (if you forgot your Apple ID then go to Apple iforgot). Visit the Apple Online Store, click on “Account” in the store menu, then click “Downloadable Software Purchases,” enter your Apple ID and password, and click the link to the QuickTime MPEG-2 Playback Component to download it again.
If you obtained the MPEG-2 Playback Component from the installation of Final Cut Studio, then you can reinstall it again from the Final Cut Studio DVD. Insert the DVD and use the Finder’s Go menu > Go To Folder… command to get to the /Volumes/Final Cut Studio/Installer/Packages/ folder inside the DVD. Locate the QuickTimeMPEG2.pkg or the QuickTimeMPEG2Pro.pkg installer: double-click it to reinstall the MPEG-2 component.
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