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Render files are the video files that Final Cut Pro creates when you make adjustments to your video clips. Add a filter or transition, crop the image change the clip's speed, and Final Cut Pro has to create brand new video files using your original media and applying the changes, so that the video can be viewed or exported with the desired effects in place. When the video is played in the project timeline, the render files are played in place of the original video clips, where you have added effects.
But what do you do if the render files become corrupt? Or when projects are completed and you want to back them up without the render files? With legacy Final Cut Pro you only had to look on your scratch disk to quickly locate and remove bad or unneeded render files, but Final Cut Pro X render files are stored with each Event in the Final Cut Events folder and each project in the Final Cut Projects folder.
Final Cut Pro X automatically generates render files for video and audio whenever an adjustment or effect is applied to a video clip. FCPX also generates and stores thumbnail images of video frames and still images in the render folders. Render files can be removed from within FCPX or directly in the Finder. Apple recommends removing render files from within FCPX as the easiest and cleanest method. But if render files are causing problems it may be necessary to remove them from the Finder. Let's look at removing them from within FCPX first.
Use Your Inside Voice
Because Final Cut Pro X generates render files for both Events and Projects you will first need to select the Event or Project whose render files you wish to remove in order to remove them. We'll remove the Event render files first.