Blur the input video without impacting the outlines.

The filter accepts the following parameters: luma_radius:luma_strength:luma_threshold[:chroma_radius:chroma_strength:chroma_threshold]

Parameters prefixed by luma indicate that they work on the luminance of the pixels whereas parameters prefixed by chroma refer to the chrominance of the pixels.

If the chroma parameters are not set, the luma parameters are used for either the luminance and the chrominance of the pixels.

luma_radius or chroma_radius must be a float number in the range [0.1,5.0] that specifies the variance of the gaussian filter used to blur the image (slower if larger).

luma_strength or chroma_strength must be a float number in the range [-1.0,1.0] that configures the blurring. A value included in [0.0,1.0] will blur the image whereas a value included in [-1.0,0.0] will sharpen the image.

luma_threshold or chroma_threshold must be an integer in the range [-30,30] that is used as a coefficient to determine whether a pixel should be blurred or not. A value of 0 will filter all the image, a value included in [0,30] will filter flat areas and a value included in [-30,0] will filter edges.