[FFmpeg-trac] #4025(documentation:open): Encoding speed of webm (vp8/theora) has declined signficantly

FFmpeg trac at avcodec.org
Wed Oct 15 20:58:42 CEST 2014

#4025: Encoding speed of webm (vp8/theora) has declined signficantly
             Reporter:  dowdle       |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  minor        |                Component:
              Version:  unspecified  |  documentation
             Keywords:  vpx          |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
Changes (by jamal):

 * keywords:   => vpx
 * priority:  normal => minor
 * status:  new => open
 * component:  undetermined => documentation


 Looking at the history of libvpxenc.c, it seems the one of the default
 settings was changed starting with ffmpeg 2.2, commit
 34e32d6464135a03da14d5b0aef1d42796939eae (Changing the speed/cpu-used
 setting from 3 to 1).

 If you use the default settings (Like you're doing with the command line
 example you gave above) then it will of course be slower now since we
 default to a slower but higher quality encoding setting.

 For an approximation of the old behavior back try running something like
 "ffmpeg -y -i source.mp4 -f webm -cpu-used 3 -b:v 800k -b:a 96k -ac 2 -sn

Ticket URL: <https://trac.ffmpeg.org/ticket/4025#comment:1>
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