I've been searching the internet for a way to get 30fps out of a PAL GH3 and I think I have found it. Now I am wondering if this is common knowledge or maybe I'm barking mad.....
I made an 80% recording using the 24p MOV setting. In Compressor I conform the footage at 30p and reduce the duration by 80%.
I now have a clip that runs at 30p (I did try 29.97, but that ran out of sync after a minute).
I made a test with separate sound, filming my clapper app on the iPad. It was displaying the timer so I could compare footage against the clock. The clapper syncs perfect over several claps.
Anyways, ignore me if this is common knowledge!