FCPX cannot link mp4 to mov in a batch, but it can do it one by one. You must have the exact same audio channels on your proxy media, though, and it needs to match the number of channels and on your high res original files exactly. If your audio channels match, you can relink, but you have to select each clip in the list and manually link them one by one by finding each file.
Thanks, Jeremy
No dice. I’m afraid. You did mean File/Relink… right?
Error message below indicated I need to relink the same media type (presumably .mp4). The audio is unchanged.
“Incompatible file.
The original file and new file have no shared media range.
Relinked files must have the same media type and similar audio channels as the original files, and must be long enough to cover all the clips that reference the files.”
I’m going to try editing the XML to point at the 422 original files.
Are there any recommendations for doing this?