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vu-gauss-blur gaussian blur, -c to only blur chroma
vu-transform transformation by matrix multiplication, -t for tiling, -s for improve quality
on downscaling (pixels' neighbours must not change)
vu-chroma-key replace a chroma with transparency
vu-primary-key replace a primary with transparency, -g for greyscaled images
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, -t for creating tiling instead of cropping
vu-extend extend the video on which side with transparency, , -t for tiling
vu-distort-map remap pixels using the X and Y values, -t for tiling, -s for improve quality
on downscaling (pixels' neighbours must not change)
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