[MPlayer-DOCS] scale video filter

[Diego Biurrun]

Hi!

In the description of the scale filter d_width and d_height is
mentioned:

scale[=w:h[:interlaced[:chr_drop[:param[:presize]]]]]
  Scales the image with the software scaler (slow) and performs  a
  YUV<->RGB colorspace conversion (also see -sws).

  w,h
    scaled width/height (default: original width/height)
    NOTE:  If -zoom is used, and underlying filters (includ-
    ing libvo) are incapable  of  scaling,  it  defaults  to
    d_width/d_height!
      0:   scaled d_width/d_height
     -1:   original width/height
     -2:   Calculate w/h using the other dimension and the
           prescaled aspect ratio.
     -3:   Calculate w/h using the other dimension and the
           original aspect ratio.

What the heck is d_[height|width]?  Attila said it was an internal
libvo variable.  He did not know whether this was before or after
aspect correction, though.  Can somebody shed some light on this?

Diego