FFmpeg 4.4.5
Since* 4.4
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Convert video to gray using custom color filter.

A description of the accepted options follows.

cb

Set the chroma blue spot. Allowed range is from -1 to 1. Default value is 0.

cr

Set the chroma red spot. Allowed range is from -1 to 1. Default value is 0.

size

Set the color filter size. Allowed range is from .1 to 10. Default value is 1.

high

Set the highlights strength. Allowed range is from 0 to 1. Default value is 0.

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Commands

This filter supports the all above options as commands.