[MacPorts] #42299: ImageMagick: support converting videos

[MacPorts]

#42299: ImageMagick: support converting videos
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  Reporter:  tony.mannucci@…  |      Owner:  ryandesign@…
      Type:  enhancement      |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  ImageMagick      |
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Comment (by petr@…):

 I today ran into the same issue, actually there may be even to different
 issued.

 (1) Trying to get an AVI video output resulted in only the first frame
 being present in the resulting file
 (2) MPEG output tries to call avconv, this seems to be part of a library
 called libav

 I understood, that only (2) delegates conversion to ffmpeg (or maybe libav
 as an alternative). While (2) should be built-in, so this maybe a
 different problem.

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Ticket URL: <https://trac.macports.org/ticket/42299#comment:6>
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