Swirl swirls the image centered at the specified coordinates and up to a given maximum radius. The swirl starts from zero, increases to full size in the first 1/3 of frames, remains at this size for the next 1/3 and reduces to zero in the last 1/3 length of effect . Step gives control of the fineness of the detail. The smaller the step the slower is processing. RGB, YUY2 and Planar 8/ 9-16/32 bit depth color formats are supported. Thread Safe.

Details of parameters
Description Name Type Limits Default
clip clip none
start frame number sf Integer within clip first frame
end frame number ef Integer within clip last frame
direction of swirl dir string "clock" or "anti" "clock"
maximum radius of swirl rmax integer 8 or more 1/2 of diagonal
coarseness step of swirl step integer 4 to 64 8
x coordinate of the swirl center x integer in frame mid frame
y coordinate of the swirl center y integer in frame mid frame

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