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Group: Administrators
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The screen area inhabited by the video needs to be constantly re-drawn, because a video -- in essence -- is just a rapid series of static images. You thus cannot overlay a <picture> on a <video>. The <picture> would be visible for a single frame and then disappear once the screen-area inhabited by the video gets re-drawn the next time. Your only option is to overlay the <video> with *another* <video> as in
/ stimulusframes = [1=backgroundvideo, overlayvideo]
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