[Bug 208457] multimedia/ffmpeg: add ZIMG option (-vf zscale)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208457

            Bug ID: 208457
           Summary: multimedia/ffmpeg: add ZIMG option (-vf zscale)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch, patch-ready
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: multimedia at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: multimedia at FreeBSD.org
        Depends on: 207547
 Attachment #168876 maintainer-approval?(multimedia at FreeBSD.org)
             Flags:
          Assignee: multimedia at FreeBSD.org
             Flags: maintainer-feedback?(multimedia at FreeBSD.org)
                CC: multimedia at FreeBSD.org

Created attachment 168876
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=168876&action=edit
v0

>From ffmpeg-filters(1) manpage:

   zscale
       Scale (resize) the input video, using the z.lib library:
       https://github.com/sekrit-twc/zimg.

       The zscale filter forces the output display aspect ratio to be the same
       as the input, by changing the output sample aspect ratio.

       If the input image format is different from the format requested by the
       next filter, the zscale filter will convert the input to the requested
       format.

Basic testing:

  $ ffmpeg -i /path/to/foo.mp4 -vf zscale=w=320:h=-1 bar.mp4
  $ mpv -vf lavfi='"zscale=w=320:h=-1"' /path/to/foo.mp4


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207547
[Bug 207547] [exp-run] Update ffmpeg to 3.0
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