[FFmpeg-trac] #3583(undetermined:new): Internet Explorer fails to play WebM files produced by ffmpeg

[FFmpeg]

#3583: Internet Explorer fails to play WebM files produced by ffmpeg
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             Reporter:  Gray         |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:
              Version:  2.2.1        |  undetermined
             Keywords:  regression   |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by cehoyos):

 Replying to [ticket:3583 Gray]:
 > Internet Explorer shows "Invalid Source" when trying to play WebM files
 encoded with ffmpeg 2.
 > Videos encoded with ffmpeg 1.2 seem to work fine.

 Sorry, I don't understand:
 All sources I found claim that IE does not support WebM at all: How can I
 reproduce the regression?

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Ticket URL: <https://trac.ffmpeg.org/ticket/3583#comment:4>
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