[FFmpeg-trac] #2150(undetermined:new): scale video filter improvement

[FFmpeg]

#2150: scale video filter improvement
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               Reporter:  burek      |                  Owner:
                   Type:             |                 Status:  new
  enhancement                        |              Component:
               Priority:  wish       |  undetermined
                Version:             |               Keywords:
  unspecified                        |               Blocking:
             Blocked By:             |  Analyzed by developer:  0
Reproduced by developer:  0          |
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 Could "scale" video filter be improved in such a way that users could
 define X:Y as a maximum sized box in which the input video should be
 scaled, keeping aspect ratio? Something like: "-vf
 scale=640:480:keep_aspect_ratio"

 This would work the same as "-vf scale=640:-1" when the input video has
 got width > height and "-vf scale=-1:480" when the input video has got
 height > width.

 Right now, without this feature, users have to use either ffprobe or
 ffmpeg to first determine which dimension is greater and based on that,
 they would launch either 640:-1 (if width is greater than height) or
 -1:480 (when height is greater than width). But with this feature, users
 would be able to do it all with one simple command.

 Maybe a simple flag could be added, so that it could be written like this:
 "-vf scale=640:480:flags=keep-ratio" or something similar.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2150>
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