Drops in exported movies

Hi there,
For some reason I sometimes find drop-outs of 1 frame in my exported videos in FCPX. It happens rarely, but I sometimes get one or two in a 4 minute movie, see the attached screenshot for what I mean. I have a MacPro 2010, 16GB memory and an ATI Radeon HD 5770 1024 MB videocard. I shoot with the Sony FS5 and import my files always as optimized media [and proxy]. I found out a way to solve the problem which is to re-edit the shots where it happens, but I would like to know what the reason is, that this happens. And how come it only happens every now and then...? Does anybody have an idea? Thanks in advance.
Pim / the Netherlands

Hoi Pim,

This is not a common issue. Could you re-attach the screenshot? Use JPEG and make sure your screenshot is not larger than 350KB. Also, to what format are you exporting your videos?

- Ronny

Hi Ron, thanks for your response. I've added a screenshot. Hope you can tell me more. I always export as 1920x1080 codec H264.

Hey Pim,

These are pixelated frames. Can you do a test?

Export as a ProRes 422 file instead of H.264 to see if you still get these random pixelations in the ProRes files. If you still have the issue, I would delete the FCP X preferences.

- Ronny