TODO


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vu-reverse		put frames in reverse order
vu-transpose		transpose frames
vu-cut			retain a segment of frames
vu-set-saturation	multiply saturation, -w can be used to use the X and Z values as the whitepoint
vu-blur			gaussian blur
vu-transform		transformation by matrix multiplication
vu-chroma-key		replace a chroma with transparency
vu-from-video		use ffmpeg to convert from another format
vu-to-video		use ffmpeg to convert to another format
vu-primaries		given three selectable primaries split the video into three side-by-side which
			      only one primary active
vu-crop			crop video
vu-extend		extend the video on which side with transparency
vu-add			perform addition on each channel
vu-sub			perform subtraction on each channel
vu-mul			perform multiplication on each channel
vu-div			perform division on each channel
vu-exp			perform exponentiation on each channel
vu-min			perform clipping to lower bound on each channel
vu-max			perform clipping to upper bound on each channel
vu-distort-map		remap pixels using the X and Y values