[MacPorts] #56417: transcode @1.1.7_21 fails to build with ffmpeg 4

[MacPorts]

#56417: transcode @1.1.7_21 fails to build with ffmpeg 4
------------------------+-----------------------
  Reporter:  tehcog     |      Owner:  Liontooth
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.3
Resolution:             |   Keywords:
      Port:  transcode  |
------------------------+-----------------------

Comment (by mf2k):

 The attached patchfiles should follow the standard naming convention and
 prepend "patch-".

 Can you please clarify which patchfiles should be removed?

 It looks like at least
 {{{
 patch-ffmpeg-0.11.diff
 patch-ffmpeg-2.0.diff
 patch-ffmpeg-2.4.diff
 patch-ffmpeg-3.0.diff
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56417#comment:9>
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