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Jib

The arm of a mechanical crane.

Judder

An instability introduced when images sampled at one frame rate are converted to a different frame rate for viewing. This effect is most noticeable when frames are repeated or deleted in order to obtain slow motion or fast motion. See also motion artifact.

Jump Cut

A cut involving an interruption to the continuity of time, where the image in a shot closely matches the image of the previous shot.