dsize[=aspect|w:h:aspect-method:r]　Fraternity7

dsize[=aspect|w:h:aspect-method:r]
    Changes  the  intended display size/aspect at an arbitrary point
    in the filter chain.  Aspect can be given as a fraction (4/3) or
    floating point  number  (1.33). Alternatively, you may specify
    the exact display width and height desired.  Note that this fil-
    ter  does  not do any scaling itself; it just affects what later
    scalers (software or hardware) will do when auto-scaling to cor-
    rect aspect.

   <w>,<h>
     New display width and height.  Can also be these special
     values:
     0:   original display width and height
    -1:   original video width and height (default)
    -2:   Calculate w/h using the other dimension and the
    original display aspect ratio.
    -3:   Calculate w/h using the other dimension and the
    original video aspect ratio.

   EXAMPLE:
      dsize=800:-2
      Specifies a display  resolution  of  800x600
      for  a  4/3  aspect  video, or 800x450 for a
      16/9 aspect video.
   <aspect-method>
     Modifies width and height according to  original aspect
     ratios.
    -1: Ignore original aspect ratio (default).
     0: Keep display aspect ratio by using <w> and <h> as
    maximum resolution.
     1: Keep display aspect ratio by using <w> and <h> as
    minimum resolution.
     2:  Keep  video aspect ratio by using <w> and <h> as
    maximum resolution.
     3: Keep video aspect ratio by using <w> and  <h>  as
    minimum resolution.

   EXAMPLE:
      dsize=800:600:0
      Specifies  a display  resolution of at most
      800x600, or smaller, in order  to  keep  as-
      pect.

   <r>
     Rounds up to make both width and height divisible by <r>
     (default: 1).