[MacPorts] #69808: ffmpeg*: ability to select ffmpeg version as default

[MacPorts]

#69808: ffmpeg*: ability to select ffmpeg version as default
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  Reporter:  eirnym          |      Owner:  mascguy
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.9.3
Resolution:                  |   Keywords:
      Port:  ffmpeg6 yt-dlp  |
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Comment (by eirnym):

 @ryandesign yes, I've did exactly that. I've grepped, and filtered results
 explicitly say that they depend on ffmpeg 7 or it's libraries.

 Then I've manually checked the rest (which was only the few of them)

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Ticket URL: <https://trac.macports.org/ticket/69808#comment:11>
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