That's what I thought too!
The drone footage was viewable in quicktime and VLC, but the footage from the FS5 was converted to something else. Not sure if it's just a sony to FCPX thing or not. It doesn't look like FS5s record in any XALG, only XAVC which is what I had when I pulled it off the camera, which I could view from the card using VLC off the original media. FCPX definitely re-wrapped this into something else, something that I could no longer view on any other computer without opening FCPX and exporting them as a different file.
After the help from the forum, I found this article describing the issue, in case anyone stumbles across this post:
Thanks for the replies everyone. It looks like when FCPX ingests the footage, it turns it into an XALG codec when you access the clips in finder. Even after installing FCPX on the computer, VLC and Quicktime still couldn't read the files. They were originally from an FS5 , so maybe that had something to do with it. I ended up just selecting all of the files from the event and exporting them out. It's good to know that the "original media" isn't necessarily original, and you should always keep a backup of the raw media!
I'm opening up a FCPX project on a mac that doesn't have FCPX on it. I've accessed the original media folders within the folder structure, and all of the media is there, however, when I try to watch it in quicktime or VLC it shows up blank. They are all .mov files that were ingested by FCPX, but can I not watch this footage without FCPX? I'd like to send the files over to someone else, do I need to open them and re export each individual one in FCPX in order to do so? Any help would be great, thanks!