geq filter, documentation

[Michael Koch]

Summary of the bug:

In the documentation for the "geq" filter all x and y must be replaced by capital letters X and Y, in the following lines. In the example section it's all written correct. It doesn't work with lower case.

p(x, y)

Return the value of the pixel at location (x,y) of the current plane.

lum(x, y)

Return the value of the pixel at location (x,y) of the luminance plane.

cb(x, y)

Return the value of the pixel at location (x,y) of the blue-difference chroma plane. Return 0 if there is no such plane.

cr(x, y)

Return the value of the pixel at location (x,y) of the red-difference chroma plane. Return 0 if there is no such plane.

r(x, y)
g(x, y)
b(x, y)

Return the value of the pixel at location (x,y) of the red/green/blue component. Return 0 if there is no such component.

alpha(x, y)

Return the value of the pixel at location (x,y) of the alpha plane. Return 0 if there is no such plane.

For functions, if x and y are outside the area, the value will be automatically clipped to the closer edge.

[Carl Eugen Hoyos]

Please send your patch - made with git format-patch - to the FFmpeg development mailing list.

[Gyan]

The lower case represent variables, not constants

i.e.

p(x, y) means user can supply p(64,24) to reference the value of pixel at X=64,Y=24.
p(X,Y) is a way to self-reference the pixel being evaluated.