An Issue with FCPX that seems to have gone under the radar and something I've come across recently is that; say, your doing a hand over of a project you've captured everything within FCPX creating an 'original media' folder.

The editor I was working with (who would be editing in Premiere CC) needed me to provide him with a hard drive of the footage. On hand over we both noticed he couldn't even view the files so assumed my computer had a plug in his didn't. He didn't have FCPX on his machine and this seemed to be where the issue was.

As it turns out. When importing in to FCPX, the software captures the files (such as .mxf from my FS7) and converts them (without warning) in to .XALG which renders them useless for any other NLE as this codec isn't recognised outside of FCPX. This is a huge Issue in that, because the footage was captured straight in to FCPX and the XQD cards were formatted having been captured and everything backed up leaving us with only the .XALG files...

Having scratched our heads and searched the net for hours nothing useful popped up so we then had to export 20 minute prores timelines out of FCPX containing all the clips. This was a long and painful work around but it was the only way we could edit outside of FCPX...

Have you ever bothered with the optimised media function in FCPX? Neither had I, but this hidden little tool transcodes all of your dirty xalg files in to beautiful Prores clips (at the cost of a ton of HDD space. This also opens up the possibility of editing and viewing the clips in other NLE programmes so even if you don't have access to the original .MXF files you are saved!