[FFmpeg-trac] #1754(avformat:open): Error in Matroska Muxer

[FFmpeg]

#1754: Error in Matroska Muxer
-------------------------------------+-------------------------------------
             Reporter:  Dan203       |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mkv          |               Blocked By:
  regression                         |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by Dan203):

 I had reports from 3 customers, one using a Popcorn Hour, one using a
 "Panasonic TV" and another using Media Player Classic. All of them
 complained that either the file did not play at all or it playing
 squished. I put out a build where the only change I made was commenting
 out that one line that sets the DisplayUnit and all 3 reported it fixed
 the problem.

 Perhaps I'm wrong in my assessment of the spec, but all I know is that
 when the value set to 3 it fails on at least 3 players and with it set to
 0 or not set at all it works in every player I've tried. And when I remux
 the file with MKVMerge that value is removed, so at the very least it
 seems to be unnecessary.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1754#comment:3>
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