Try Step 2h below, and then 2i if you need to.
There is also this:
Have you found any other solutions? I am having the same problem, except the files wont import in even when I changed the file name!! Why!!!!!
I am having the exact same issue. It has shown up in multiple project files since my last update. I have a major piece due for release next week and this issue is standing in my way. I have over 80 shots in my sequence on a 30 second piece. If Adobe could chime in here would be greatly appreciated.
Have you tried renaming and/or moving your media files folder, and then importing/relinking?
What kind of files are these? Let us know.
The only way I fixed this was to convert each file to another video type and then replace the clip.
This option does work, however isn’t a good solution for a project that consists of more than 800 video files and you are on a deadline.
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I got this same error with many mp4 files in my project at work this week after uninstalling and reinstalling Premiere 12.1.1.
I got on with Adobe Support and had them remote takeover my computer. They quit Premiere Pro, and they went into ~/Library/Application Support/Adobe and renamed the “Common” and “Premiere Pro” folders to “Common old” and “Premiere Pro old”, respectively, and also in ~/user/Documents/Adobe/ and renamed “Premiere Pro” to “Premiere Pro old”. Premiere automatically recreates those folders after relaunch.
NOTE: I believe this was all the folders they renamed, which I’ll get to here.
Yesterday, upon restarting my computer to install an OS security update, I got the same error in my project. I manually did the same steps outlined above (from memory) and this fixed about 75% of the media mismatch errors, with some still having the exact same issue.
I had tried creating a new Premiere project and importing the same exact media into it, and it worked fine. However, similarly to your situation, our projects are too large to do any sort of manual rebuild, reconnecting, renaming, or re-importing.
I had NOT tried to solution recommended by Kevin above, renaming the folder that includes the media. That folder is being used by other editors on our team, all of whom are not having this issue, so I do not wish to knock their projects offline.
For background, my system is on El Capitan (whatever the latest number of that OS is), a Mac Pro 2013 connected to a FastNAS server via a Sonnet box using 10G.
I an posting this in hopes that it may help sooner than later, but I will be back on Monday to amend this post with more details.
I did try both of those steps... still did not work! I had to uninstall the program and install an older version for it to work!
Interesting Note: This issue occurred to me white using the April update of CC. The prproj file I was using was sent to me from someone using an older version. To resolve the issue I used the Duplicate all the files and then relink with the copies.. it worked.. although I encountered one crash about half way through the relinking process but none of my work was lost.
Short: happened while using prproj from older version, duplication re-link worked.
Are these legacy QuickTime files? Some of these are no longer supported and need to be transcoded in an earlier version of Premiere Pro, if so. Let me know details.