[FFmpeg-trac] #5037(undetermined:new): WEBM VP8 & VP9 - 2-pass encoding does not work

[FFmpeg]

#5037: WEBM VP8 & VP9 - 2-pass encoding does not work
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             Reporter:  solidghost   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  libvpx       |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by solidghost):

 I just tried whiteout adding "-an" in the first pass. Then the transcoding
 works and gives no warning about "Output file is empty, nothing was
 encoded".

 This is very strange. It feels like a Bug? Because I should be able to
 tell the first pass to skip analyzing the Audio. This is how it works with
 libx264.

 Even though it does not complain anymore, the file size and quality on
 every frame is exactly the same if I do One pass or Two pass encoding. So
 it still feels like it does not apply the information from the first pass.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5037#comment:7>
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