Create mask from input video.

For example it is useful to create motion masks after tblend filter.

This filter accepts the following options:

low

Set low threshold. Any pixel component lower or exact than this value will be set to 0.

high

Set high threshold. Any pixel component higher than this value will be set to max value allowed for current pixel format.

planes

Set planes to filter, by default all available planes are filtered.

fill

Fill all frame pixels with this value.

sum

Set max average pixel value for frame. If sum of all pixel components is higher that this average, output frame will be completely filled with value set by fill option. Typically useful for scene changes when used in combination with tblend filter.