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Well, but what is the structure of a *.fan file? The way I see it, it simply contains invalid values, which may cause QT to flip out. Since it uses bits and pieces of accelerated functions on the Mac (you know, that CoreImage/CoreAnimation/FXplug stuff) I could quite well imagine that some shared library causes a conflict when propagating the channels to the streams. I wouldn't attribute this solely to QT. Even though Apple have made a mess of it over the years, this is certainly a combination of circumstances, and core functions should work... Are there any notable discrepancies when you view the extended properties of the QT files? what do other tools say about the files' Alpha channel?
Thanks for the reply. I can't find any difference in the extended properties between the Windows and the Mac version of the QT file. Under Visual Settings - Transparency tab they both say None (allow dithering.) I tried importing the clips into Premiere, with the same results. (Windows clip shows the Alpha properly, Mac clip does not.) Unfortunately I don't have any other 3D software on the Mac to try and generate something else with an alpha channel. I could probably track down some other ways to troubleshoot, but I don't do video on a daily basis, so I don't have access to a lot of other tools.
I guess I am placing the blame on Quicktime, since I am pretty sure the .fan format has not changed, and the conversion -used- to work fine on the Mac. As far as I can recall when I first noticed the issue, it was after a system update. (ie, my version of FormZ did not change.)
I'm sure it is possible that Apple did not technically "break" anything, they just changed something on the Mac side that FormZ has failed to implement. I will follow up again with FormZ, but I am hoping someone else here may have noticed a similar issue using other software. Unfortunately it seems there aren't a lot of people doing 3D animation on the Mac these days.
Ah, I see. Might have something to do with the change of the CoDecs to "legacy" status during the 7.x QT cycle. if you are looking for another 3D tool to test - you can download Cinema 4D R11 and "activate" the demo, so it runs for 3 weeks without limitations. And of course Blender is still free. If you can provide some of those *.fan files along with a clue as to where I can find the conversion tool, I might give this a spin and cross-check on my MacBook Pro.