[FFmpeg-trac] #3491(undetermined:new): MKV muxer corrupts subtitles

[FFmpeg]

#3491: MKV muxer corrupts subtitles
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             Reporter:  ValdikSS     |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by gjdfgh):

 Depending on the reader, the extracted subtitles won't show the problem,
 btw.

 libass uses the ReadOrder field to remove duplicates (so if two events
 have the same ReadOrder value, one of them is removed, even if they are
 different).

 Extract from the file:
 {{{
 151,2,OP_Romaji_1,,0,0,0,,{\be1\an5\pos(784,56)\fscy230\fscx182\1c&HFFFFFF&\bord0\shad0}no
 152,27,OP_Romaji_1,,0,0,0,,{\be1\an5\pos(774,50)\alpha&H79&}no
 152,2,OP_Romaji_1,,0,0,0,,{\be1\an5\pos(779,61)\fscy206\fscx226\1c&HFFFFFF&\bord0\shad0}no
 153,27,OP_Romaji_1,,0,0,0,,{\be1\an5\pos(774,46)\alpha&H79&}no
 }}}

 The 3rd event is never displayed, because it has the same ReadOrder as the
 2nd.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3491#comment:11>
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