Thanks to Robbie Coblentz (Twitter: @RCoblentz), I finally learnt what flavors of the XF-AVC format are not supported in Final Cut Pro X yet.
In this screencast he took the time to make, he proves that FCPX 10.2.2:
Supports all YCC 4:2:2 10-bit Canon C300 Mk II formats: HD/2K/UHD/4K.
Doesn't support any of the RGB 4:4:4 formats (HD/2K) regardless of the bit depth (10/12-bit).
I hope this is useful for someone else in this forum. I will definitely send feedback to Apple about this issue. Hopefully they will support 4:4:4 RGB clips from the Canon C300 MK II in future updates.
Strange thing is that I have the same version of both FCPX and OSX and I have installed the latest Apple pro video formats plugin but all the files on my import window are greyed out. I shot everything in HD YCC 10bit. The only thing I can think of doing is a fresh install, so that's what I'm doing now.
Here's a little video to demonstrate how my FCPX setup, running a 6 core Mac Pro with all the latest plugin and software versions, still does not allow me to import 10 bit footage from the Canon C300 Mark ii.
Anyone that can help me solve this little mystery will be an instant legend.
you need to install the Canon XF Utility 2.1 for XF-AVC for this to work (for the regular C300, it was a plugin). Look at their support site. Remember, even though FCPX has native support for MXF, if you don't use this plugin, you will not get your clip spanned and rewrapped with the proper metadata applied. On the C300, for example, if you roll longer than around 5 minutes, it will create another MXF segment (so each segment is limited to about 2 GB).
Also something to check is that you need the correct file structure for it to recognize it as if it was on a card. This is a common problem when there's no proper DIT, and some random person copies the cards onto a drive badly. You should be able to reconstruct the file structure if it wasn't done right.
Thanks for the input. But yes, I had just installed the utility today (before the update) and no dice. Installed again after the update--and still doesn't import. X can read the file structure but the actual clips turns from white to gray and cannot be imported. Very odd.
Ha! I just installed the update and it still doesn't recognize the XF-AVC file structure for me, so I have to dig down into the 'Clips' folder at which point the MXF files all turn grey and are not importable. I suspect it's something to do with my system, which I migrated from my old mac so I think it's time to do a clean install of El Capitan and add things one by one.
Did any of you guys try reformatting the cards from within the camera or checking for updates for the camera?
I've never used a Canon C series, but with certain Sony cameras/formats the cameras had to have a firmware update and then the cards had to be reformatted with the camera (not a computer) before FCPX would see the files to import.
(remember that reformatting a card completely erases it)
also, sometimes if there are multiple formats on one card, FCPX will only see/import one.