You can avoid clipping by vidding in Blender, which is available for all platforms! Come on over to Blender -- no clipping, easy-to-learn UI... Okay, no, I can't keep this up; I'm not that cruel.

Seriously, though, if you don't mind the other qualities of Blender, it does run quite nicely on a Mac. I've done it! (I've also tried to use Blender on the Windows machine at work, but the machine didn't seem to have codecs installed yet, and mainstream OS or not, no one on the internet could explain to me how to successfully install the damn things.)