- Add X265 knob (default off) for X.265 (HEVC) encoding support using
  multimedia/x265.

  Example usage:  (-c:a libfdk_aac needs FDK_AAC knob too)

	ffmpeg -i $inputvideofile -c:a libfdk_aac -b:a 64k -c:v libx265 -x265-params crf=31 $outputfile.mkv

  This can now be played back by at least ffplay (needs SDL knob),
  vlc, mplayer, mpv, xine.  (and gives a nice reduction in file size.)

No objection from:	multimedia@ list


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@371179 35697150-7ecd-e111-bb59-0022644237b5