How to fix the video glitch/pixelated problem

Select the affected clips in the browser. Control-click on one of the selected clips and choose Transcode Media...

FCP X will always use Optimized media if it is available, otherwise it will use the original media.

NOTE: Optimized media takes significantly more space than original media.

When finished, and before you archive your library, you will want to delete it (since it can always be regenerated later if necessary).

To do that, select the library in the sidebar, and do File->Delete Generated Library Media...

Hi, Luis,

Very helpful advice. I'm about to try it, as I am experiencing exactly the same problem. When you mention to select a clip, is it the clip we are aiming to keep, or the one that appears and disappears, or both?

I've seen another person suggesting to "create proxy media" instead of "optimising media". What is the difference between these two? Are we compromising or maximising quality by using one or the other?

I much appreciate your support.

Thanks a lot

Tania

I mean the clip (or clips) that exhibit the glitch. Select it (them) in the browser and create optimized media for them.

Proxy media is a smaller size, lower quality media, meant only to ease the editing process, not usually for export. It is useful when your mac can play smoothly the original. You are supposed to switch back to optimized/original before exporting - which, in the present case, would defeat the whole purpose.

Hi, Luis. Thanks a lot. I have recently changed the rate of frames per second in the settings on the new projects I create to adjust it to the rate of my camera and I find that the glitches are not occurring. The default for FinalCutProX was 23.92 but my camera films at 30. I wonder if that might be the issue for others too. Since I’ve done that I haven’t had any glitches.

thanks for the discussion everyone

Where does the footage originate from? One recent iPhone, perhaps?

This has been known to happen, and when it does the current workaround is to optimize the media.

Exporting to H264 is perfectly adequate.