[Michael Buell]

I had a similar problem a while back and found this short guide, it worked perfect for me! :

“I’ve just found a way to get around this install ‘problem’. In order to get these codecs to show and also to have access to all the other georgeous 422 codecs and other goodies, firstly download the new QT codec pack: https://support.apple.com/kb/DL1396 . Next, use the little app UNPKG ( https://www.timdoug.com/unpkg/ ) to unpack the contents by simply dragging the downloaded .dmg file onto the app window. This then unpacks a master folder onto the desktop. Inside this folder, navigate down until you get to the QT .component files.

Next, drag these into your HD/Library/Quicktime/ folder and then the codecs will magically appear in all other applications like MPEG Streamclip, QuickTime Pro, etc (I would recommend renaming any existing .component files just in case of problems of course). I’ve done a test with it and it works like a charm on my Mac Pro running 10.6.7 and FCP 6. I was able to render out 422 LT clips from QuickTime Pro and MPEG Streamclip to use in a project. All the correct 422 labels also show in the codec lists in all encoding apps. If you try and install the QT codec pack on anything other than FCP X it gives an error, but this manual installation method gets around Apple’s insistence that you buy everything new the minute it comes out! You can keep FCP 7 and X, I’m quite happy with 6!”