Had visual freezing problems with some videos that had framerates more than 30fps. I asked here and on the Serato forum what the optimal setting for encoding on FCPX and the answer I got was "leave the source frame rate"! This was a conundrum as anything higher than 30 I got visuals freezing in ME. The work around for me (either of the following) 1. Uncheck GPU acceleration in ME or 2. Reencode the videos to 30 Frames per second or less. I still posit the same question, in a Final Cut Pro X and Handbrake workflow, whats the optimal setting for 720p and 1080p music videos?