While I know this is pretty new stuff, the 4K that is, if Premiere and Media Encoder can read it fine, shouldn't AE? Here's the real rub. I'm using some F5 4K footage in Premiere CC and when I send to After Effects CC, AE reports an error saying it can't be read. Q2: MXF plays fine in every Adobe product but After Effects mxf files that I am able to import with CS5.5. Was playing around with the Demo for CS6 and discovered to my dismay that I can't import xdcam. And there are some frequently asked questions quoted below: Many MXF to After Effects issues still exist there and troubled the users. However, different source files work differently in After Effects. It's really a big boost that Adobe After Effects CS6, CC offers much better native MXF support than its predecessor.