Final Cut Pro – Working with long image sequences
Too many images gums up the system.
An image sequence is a number, generally a very large number, of still images that you want to build into a movie. They’re most often created in stop-motion animation, or exported from 3D packages during rendering.
It’s a bad idea to load very large numbers of individual images into FCP. The frames get loaded into RAM which fills up quickly. Even if you adjust the Still Image Cache, if you are using thousands of images, it is very easy to bring your system to its knees.
Instead, open a long image sequence in QuickTime Pro using File > Open Image Sequence, and point it to the folder containing your images to open them as a single file.
Then select File > Export to export this sequence as a QuickTime movie. For highest quality, set the codec to either QuickTime Animation, ProRes 4444, or match the codec you plan to use for your Final Cut Pro sequence.
Courtesy of Larry Jordan