[FFmpeg-trac] #7719(undetermined:closed): 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:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  invalid
             Keywords:  vp9 alpha    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by rroller):

 Just following up here in hopes it helps anyone who might run across this.
 I'm compiling both libvpx and ffmpeg from source. I needed to include
 --extra-libs="-lpthread -lm" to the ./configure of ffmpeg, without that,
 libvpx-vp9 wasn't picked up.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7719#comment:7>
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