Gray borders around white video in After Effects

Hi, I'm doing hundreds of training films with a greenscreen who later gets a white background. This looks cool in white website, however, sometimes, the video have a gray border. In this case cpmpletely RANDOMLY. I know, because we produce them all in the same way... It seems that it is an Adobe Bug of some sorts. I really hope that someone can help you. It really is time to export the same video three or four times, just so that there be no gray the fourth time at the border. (To be clear: I do not use *.) PNG, or *. PSD or any key to chroma, just on a solid white After Effects). I know that this happens in Adobe Media Encoder as wel as in After Effects. Once again, quite randomly. For most borderless, but sometimes the border grey.

Screen Shot 2016-09-01 at 10.27.38.png

Screen Shot 2016-09-01 at 10.37.06.png

UPDATE: the bug isn't in Adobe AE. I'm the bug. In some of the video I didn't put a solid white background, only a white background in the composition settings. When I placed a white soilid in this sequence, the grey line disappeared...

Rick Gerard and Roei Tzoref, thanks for your help anyway!

Tags: After Effects

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