Comments

Chienworks wrote on 1/1/2015, 6:24 PM
Compress less. Use a higher bitrate when rendering.

Not sure why you would see them in preview, since recompression hasn't happened yet, unless you're using a pre-render?
Poomp wrote on 1/2/2015, 3:30 PM
I've had a similar problem, was from some files from a video capture program (Debut).

The files looked great in regular media players, but when brought in to edit they looked really bad, glitchy. There was ghosting, pixelating and artifacts that are not present in the original file, even in preview. I was hoping the problem was only in preview, but the output was just as terrible.

It seemed to be some sort of compatibility hiccup with those specific mp4 files.

As a work around I recompressed the clips with a converter first, then brought in the new files. If you don't want any quality loss when converting, go with a lossless format. Brace yourself for huge filesizes though.
USMChardcharger wrote on 11/9/2015, 5:23 PM
click on the clip in the timeline (right click)...go to switch...turn resampling off. Should help.