remove-logo=/path/to/logo_bitmap_file_name.pgm
Suppresses a TV station logo, using a PGM or PPM image file to
determine which pixels comprise the logo. The width and height
of the image file must match those of the video stream being
processed. Uses the filter image and a circular blur algorithm
to remove the logo.
/path/to/logo_bitmap_file_name.pgm
[path] + filename of the filter image.