Question / Help OBS added an edge to MOV media with Alpha channel

Godmin

New Member
Today I ran into an issue that really troubled me. I tried several ways but could not figure it out. Need some help.

The issue is with a MOV media which has alpha channel. I created this MOV using AE . The lady in the MOV file has clear and clean edge around her legs.

However when I added this media file on top of a background photo in OBS, the legs have dark edge around in OBS's preview window. See left side of my attached 1st photo.

I used same media file and same background photo in other video editor, there is no dark edge around her legs at all. See right side of my attached 1st photo.

Is there some setting or filter OBS can fix the problem? or something wrong with my MOV media file? I encoded the MOV file in QuickTime format using codec Apple ProRes 4444, RGB+Alpha. The property of the MOV file is attached in 2nd photo.
 

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Godmin

New Member
I finally figured out the reason by luck.

The root cause most likely that OBS does not process the premultiplied Alpha media file properly. After I switched to straight Alpha to encode the video clip, then OBS loaded this overlay video without any unexpected edge.
 
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