[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
-------------------------------------+-------------------------------------
             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
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 I tested the following command lines and the bitrates in the output files
 are very close to what I requested for vp8:
 {{{
 $ ffmpeg -f lavfi -i testsrc2 -vcodec vp8 -pass 1 -t 120 -vb 500k
 out1.webm
 $ ffmpeg -f lavfi -i testsrc2 -vcodec vp8 -pass 2 -t 120 -vb 500k -y
 out1.webm
 }}}
 {{{
 $ ffmpeg -f lavfi -i testsrc2 -vcodec vp8 -pass 1 -t 120 -vb 200k
 out2.webm
 $ ffmpeg -f lavfi -i testsrc2 -vcodec vp8 -pass 2 -t 120 -vb 200k -y
 out2.webm
 }}}
 vp9 does not produce an output file of the requested size with my old
 version of libvpx (1.3) but I get different output file sizes for
 different requested bitrates.
 {{{
 $ ffmpeg -f lavfi -i testsrc2 -vcodec vp9 -pass 1 -t 120 -vb 200k
 out3.webm
 $ ffmpeg -f lavfi -i testsrc2 -vcodec vp9 -pass 2 -t 120 -vb 200k -y
 out3.webm
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/5037#comment:6>
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