[MacPorts] #51221: py-bob-io-video: build fails with ffmpeg-3.0+

[MacPorts]

#51221: py-bob-io-video: build fails with ffmpeg-3.0+
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  Reporter:  devans@…         |      Owner:  tiago.pereira@…
      Type:  defect           |     Status:  closed
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:  fixed            |   Keywords:  haspatch
      Port:  py-bob-io-video  |
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Comment (by tiagofrepereira@…):

 Thanks for the patch @devans,

 I will apply this fix in our master branch.

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Ticket URL: <https://trac.macports.org/ticket/51221#comment:2>
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