[FFmpeg-trac] #2835(avformat:open): FFMPEG created WTV files stop working with Microsoft Update KB2670838

[FFmpeg]

#2835: FFMPEG created WTV files stop working with Microsoft Update KB2670838
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             Reporter:  ramitbhalla  |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  wtv          |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Comment (by cehoyos):

 Allow me to try to summarize:
 * MS invented a new media file format "wtv" and did not provide any
 documentation
 * FFmpeg developers reverse-engineered the format, creating a demuxer and
 a muxer
 * The muxer worked fine for the codecs it supported
 * The muxer still works fine if you did not update Windows
 * MS changed something within their operating systems (the wtv filter)
 that makes the files (the muxer) not work anymore

 Did anybody report this to Microsoft? Asking for hints how this should be
 fixed? Sending them a short file that used to work but does not work
 anymore? The reason I ask is that nobody posted a link to a MS support
 forum where this is discussed nor some excerpt of an email exchange.
 We are of course (very) thankful that this problem was reported here but
 please understand that there is not much FFmpeg developers can easily do
 about it. I am not saying MS will help in any way but for those who are
 interested in this problem the most simple way to go would probably be to
 (also) report this to MS.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2835#comment:7>
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