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FCP is a strange bird—it will work flawlessly 95% of the time and then it will fail in the most inscrutable, frustrating way possible.
I've had that experience with analyzing optical flow on a semi-regular basis. Usually probably when I change the duration or something of a clip that was already analyzed for a speed change. Sometimes the analysis won't run again even though the clip has the "analyzing optical flow" caption over it, and when I export it flags that optical flow analysis is incomplete. Restarting the program usually won't solve it. I looked online and it turns out others have had this problem. The only thing that sometimes works is to delete the analysis files folder in the library, and then if you're lucky it will do the analysis. It's maddening
Is your hard drive totally full? If not, it might be time to try updating and/or uninstalling and reinstalling
So you see the changes in the edit/timeline but not the final exported file?
Where are you exporting the file to? (In other words, make sure the export process is not failing and you're not accidentally watching an old file that you still have open in QuickTime that the new one is supposed to be replacing in the same location.)
That's all I personally can think of as of right now. I've had some quirky bugs in FCP over the years, but never heard/saw something like that. The closest would be the above scenario where the export process failed me and I briefly didn't notice the notification and I was wondering why the file on my desktop was still the same old edit (and this only happened when I didn't delete the old file and instead chose to overwrite it because I might have been rushing or lazy).
Try "Delete Generated Library Files" and make sure everything is checked: "Delete Render Files" (ALL), "Optimized Media," etc. Sometimes clearing things out will fix strange render issues.
FCP is a strange bird—it will work flawlessly 95% of the time and then it will fail in the most inscrutable, frustrating way possible.
Try making a blade cut into the clip and then undoing it; usually it forces the analysis to restart. But agree it's an annoying bug, same with stabilization at times.
what happens tho if you hypothetically had like a one hour edit with 20 different optical flows...when you delete & restart surely you'll get a notification that says something isn't finished, right? and then you have to track it down manually?
I was wondering about deleted files. Once I know I have this short film done I will try that. It seems like for whatever reason FCP doesn't want to remember changes.
I get no notifications
what happens tho if you hypothetically had like a one hour edit with 20 different optical flows...when you delete & restart surely you'll get a notification that says something isn't finished, right? and then you have to track it down manually?