[FFmpeg-trac] #7719(undetermined:new): Extracting transparent PNGs from vp9a fails (vp8a works)

[FFmpeg]

#7719: Extracting transparent PNGs from vp9a fails (vp8a works)
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             Reporter:  rroller      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  vp9 alpha    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Changes (by rroller):

 * Attachment "vp9a.webm" added.

 vp9a file

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Ticket URL: <https://trac.ffmpeg.org/ticket/7719>
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