[MacPorts] #36705: youtube-dl should have ffmpeg as dependency

[MacPorts]

#36705: youtube-dl should have ffmpeg as dependency
-------------------------+--------------------------
  Reporter:  kyounger@…  |      Owner:  ryandesign@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.1.2
Resolution:              |   Keywords:
      Port:  youtube-dl  |
-------------------------+--------------------------

Comment (by khindenburg@…):

 Yes, I think so

 {{{
 ERROR: ffprobe or avprobe not found. Please install one.
 }}}

 {{{
     -x, --extract-audio              convert video files to audio-only
 files (requires ffmpeg or
                                      avconv and ffprobe or avprobe)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/36705#comment:3>
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