[MacPorts] #50694: ffmpeg: issues updating to version 3.0

[MacPorts]

#50694: ffmpeg: issues updating to version 3.0
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  Reporter:  devans@…                            |      Owner:  devans@…
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  baresip cmus ffmpegthumbs FreeRDP   |
  goldendict gpac libdlna libextractor           |
  libquicktime-devel mlt moc OpenSceneGraph      |
  pHash py27-bob-io-video transcode VLC VLC-     |
  devel wxsvg xine-lib xmms2 yorick-av           |
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Comment (by nicos@…):

 Replying to [comment:39 devans@…]:
 > It's the deinterlace patch that's the issue/regression.  To be
 compatible with both versions the functionality of avpicture_deinterlace()
 needs to be re-written to use the `yadif` filter via the libavfilter API.
 ffmpeg provides an example of how to use this API in
 /opt/local/share/ffmpeg/examples/filtering_video.c.  Hopefully, this is
 what the upstream developers will do.

 Indeed. There is a patch proposed in the KDE review board
 ([https://git.reviewboard.kde.org/r/126992/]), but the patch apparently
 has its own issues at present, and is meant for the Qt5 version, so that
 it would need porting for use here, so that I did not include it for now.

 > Are they aware of the issue?

 Yes. I also reported the issue in the bug tracker (see comment:19).

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Ticket URL: <https://trac.macports.org/ticket/50694#comment:40>
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