Might be some sort of my failure, but it seems that when capturing a movie with Stereo Movie Plugin on 4.12.4 BP version of engine, the editor ignores fixed framerate setting.
In my case it doesn’t follow the setting of fixed framerate of 60 FPS, which results in progressing far to fast to render a proper number of png. images.
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Actually, I managed to run stereoscopic capture plugin properly on 4.12.5. I launched game by clicking “play in standalone game” after setting “-usefixedtimestep -fps=60” in “Play” section in Editor Preferences. Works great and 360 renderings are awesome, even in this very moment I have 3 PCs working hard on my new 360 clip