[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  |
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Comment (by eirnym):

 Hi, could you explain which exactly ports it would break? The `port
 select` works perfectly in other cases as I need link only files in
 `/opt/local/bin` and not libraries.

 My problem is I installed `yt-dlp` without a hard dependency on `ffmpeg`
 and it doesn't recognise ffmpeg6. After manual linking them to versions
 without `6`, it works as expected.

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Ticket URL: <https://trac.macports.org/ticket/69808#comment:2>
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