[FFmpeg-trac] #4132(avformat:open): Remuxing of VP61 from NSV to FLV flips video

[FFmpeg]

#4132: Remuxing of VP61 from NSV to FLV flips video
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             Reporter:  dort        |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  minor       |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  flv         |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
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Changes (by cehoyos):

 * status:  new => open
 * reproduced:  0 => 1
 * component:  undetermined => avformat
 * priority:  normal => minor
 * version:  2.4.3 => git-master
 * keywords:   => flv


Comment:

 For future tickets: Please always test current FFmpeg git head before
 reporting a problem.

 Assuming you mean "vertically flipped", this is impossible to fix:
 The versions of On2 VP6 video in nsv and flv differ: One is flipped, the
 other not. You have to force the correct version of the decoder with
 {{{-vcodec vp6}}} if you want to decode such files.
 I will send a patch to print a warning when the "wrong" version of VP6 is
 muxed in flv.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4132#comment:2>
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