Rittenhouse Green-Screen? Watch the foot
(www.youtube.com)
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Good catch. Any viable explanation? Anyone?
I copied this from my original comment:
The anomaly happens within one second before the camera cuts to another angle. This tells me it's probably an artifact because most codecs such as mpeg4 use a series of keyframes, usually one per second, to refresh the compression on a regular basis. Lossy codecs will try to save space by tracking the movement of pixels or groups of pixels over time rather than encoding data for every pixel for every frame, hence you will sometimes see little artifacts like this in the frames leading up to or following a drastic image change.
not like this. it's too perfect. it effects only his foot and nothing else.
It affects the prosecutor's mouth too.
Compression algorithms are specifically designed to detect shapes and patterns, so if you have a long, unbroken texture its not uncommon for the compression to accidentally remove anomalous shapes to preserve the texture. In this case, the texture was the floor and the anomalous shape was his foot.