Stuttering clips after import to iMovie

Hi,

Putting lower frame rate clips into a higher frame rate project might be a cause of stuttering. Also, I believe that iPhones record in a variable rather than constant frame rate, so maybe that's the issue. In that case you can use the free download, Handbrake, to convert to a constant frame rate.

Using very hi-def clips in an underpowered computer might be another cause. You can can get some stuttering with the slower i5 processer, although the shared out project should be O.K.

iMovie likes clips in Mp4/AAC format, so if yours are different you might try converting them, again using Handbrake.

Audio can sometimes cause stuttering. The formats aiff and AAC are best.

-- Rich

Here are some more things that you can try:

Open iMovie while holding down the Option and Command keys and selecting to delete preferences in the box that appears. iMovie will open in a new library. Reopen your old library to get back to your projects. See if you still get the stuttering.

Try creating new projects with the subject clips and other clips to see if the problem replicates. Sometimes problems are confined to one project and do not appear in others.

Open iMovie in a new user account, such as the Guest account on your Mac, and see if the problem replicates.

All else failing, try redownloading iMovie. Drag your current iMovie app from the Applications folder to the trash, but don't empty the trash. Don't touch the iMovie Library. Then go to the online app store and redownload iMovie. If the download is successful you can empty the trash. If not, you can drag iMovie from the trash and replace it in the Applications folder.

-- Rich

Here's the link for the free download Handbrake:

https://handbrake.fr/downloads.php