Two different framerate clips gradually out of sync
I have 2 video clips.
one in 1920x1080 59.94p, and the other one in 1280x720 30p
And my project is in 1024x768 59.94p
I manually sync 2 clips at the beginning. But as it goes, they are slow out of sync, and after a few mins, it's completely out of sync. I think it has to do with framerate. Any solution for this issue? Thanks!
Final Cut Pro X, OS X Yosemite (10.10.5)