How do I play 10-bit uncompressed files?

There are a few thousand ways to encode video. Some, like your file, use uncompressed schemes.
iMovie is a DV editing app. QuickTime Pro can also open and edit most .dv files.
You need to ask the author what software (and hardware) was used in the file creation. Most of them can export to various codecs and settings and you should ask your friend to see if DV or DV Stream is an option at export and work with those files.

Hello!
I'm having the same problem and I can't get the codec to work once downloaded...
I'm on a new macbook pro (17"). my friend on an older mac laptop can play back a quicktime file in the player that has the blackmagic codec, but I cannot.

I can open the file and play it in final cut pro, I can see it in shake, but I can't play it back in the quicktime player. it shows up all white, but does list the codec as being the black magic 10 bit uncompressed codec.

I've downloaded the codec from black magic, and dropped it in /library/quicktime, but I'm not getting any result.
I've also tried "touching" the quicktime folder like they recommend, but nothing's working.

quicktime's also not playing back avi files, but I know that can be a bigger issue.

Any ideas?

thanks!
-Josh

Your trouble is the lack of "Universal" (read Intel aware software).
It may take a few months before all of these third party tools (and codecs) are available for your Mac.
Added codecs require you restart QT Pro (or maybe even your OS) before they become available.