[FFmpeg-trac] #2182(documentation:new): Padding options lack documentation

[FFmpeg]

#2182: Padding options lack documentation
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             Reporter:               |                     Type:  defect
  matteosistisette                   |                 Priority:  important
               Status:  new          |                  Version:
            Component:               |  unspecified
  documentation                      |               Blocked By:
             Keywords:               |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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 http://ffmpeg.org/ffmpeg.html

 ALL is said about padding is:

 {{{
 ‘-padtop size’
 ‘-padbottom size’
 ‘-padleft size’
 ‘-padright size’
 ‘-padcolor hex_color’
 All the pad options have been removed. Use -vf pad=width:height:x:y:color
 instead.
 }}}

 Not a word about the exact meaning of each of the height, width, x and y
 parameters. Is width the added width or the total width of original video
 plus padding? How are the x and y offset measured? Are these options
 applicable to input, output, or both? How do they combine with "-s"? The
 answers are FAR from obvious and MUST be addressed.

 The only way to figure out with such documentation is by testing.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2182>
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