Rendered mp4 has flicker on top of image

[Mike Hammond]

Hi everyone,

Rendering out mpeg2 to Sony AVC mp4. In some areas where effects are used there is noticable flicker on the top of the screen. I did a search on the forum and it looks like discussions have centered around an entire portion of a vide flickering. In my case, it's the very top of the image only.

It appears to only happen when vignetting is applied to events in which I am zooming.

Anyone else experience this and have a fix?

Thanks!