[FFmpeg-trac] #11126(avcodec:new): Filter "setpts=PTS-STARTPTS" in 2-pass VP9 may cause abnormal bitrate allocation (was: Using filter setpts=PTS-STARTPTS in 2 pass vp9 webm causes final video bitrate to be small)

[FFmpeg]

#11126: Filter "setpts=PTS-STARTPTS" in 2-pass VP9 may cause abnormal bitrate
allocation
-------------------------------------+-------------------------------------
             Reporter:  Saul Baker   |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  regression   |               Blocked By:
  libvpx-vp9                         |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Changes (by MasterQuestionable):

 * cc: MasterQuestionable (added)
 * keywords:   => regression libvpx-vp9
 * component:  undetermined => avcodec
 * summary:
     Using filter setpts=PTS-STARTPTS in 2 pass vp9 webm causes final video
     bitrate to be small
     =>
     Filter "setpts=PTS-STARTPTS" in 2-pass VP9 may cause abnormal bitrate
     allocation

Comment:

 ͏    Possible codec regression?

 ͏    "setpts=PTS-STARTPTS" may effectively do what similar to
 "-avoid_negative_ts 2"?
 ͏    https://ffmpeg.org/ffmpeg-filters.html#setpts
 ͏    [/wiki/Seeking#avoid_negative_ts
 https://trac.ffmpeg.org/wiki/Seeking#avoid_negative_ts]
 ͏    .
 ͏    Alike tend to influence the codec's encoding decision.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11126#comment:2>
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