In FCPX 10.0.8, there is a problem rendering out composited clips if there are still images in your main storyline instead of normal video footage.
I have a work-around that will allow you to accomplish your complex composites without too much inconveinence.
To duplicate the Rendering Bug:
- Edit a full frame graphic element into your main storyline in FCPX.
- a jpeg picture, a tiff, or a PSD file
- Add graphics or a generator above a portion of your main storyline as a connected clip
- Select both clips and make a new compound clip
- Animate transform properties or crop settings over the length of the entire Compound Clip.
- The Rendered video will have a motion glitch in it where the graphic element ends in the middle of your clip
How to Fix It
- Double click your compound clip to open it up in the timeline viewer
- select the graphic element in the main storyline and “lift it” from the main storyline
- <Option><Command> Up Arrow – this will “lift it” and make it into a connected clip- leaving a gap clip on the main storyline.
- Select video footage that matches the project (or timeline) settings in your event browser
- Perform a “Replace From Start” edit to replace the gap clip.
Now, step back so you can see your compound clip again. It should still have the animation keyframes that you made earlier.
It should also NOT display glitchy motion when rendered out.
Edit On, righteous dude(ette)!