[MacPorts] #59750: ffmpeg and ffmpeg-devel immediately crash with segfault 11 when input is mp4

[MacPorts]

#59750: ffmpeg and ffmpeg-devel immediately crash with segfault 11 when input is
mp4
---------------------+----------------------
  Reporter:  fdik    |      Owner:  dbevans
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.2
Resolution:          |   Keywords:
      Port:  ffmpeg  |
---------------------+----------------------

Comment (by eirnym):

 @kencu In this case you should maintain white and black lists of Xcode.
 Maybe in 11.3 the problem was absent, but in 11.4 it's present again and I
 confirm it.

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Ticket URL: <https://trac.macports.org/ticket/59750#comment:11>
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