[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
Comment:
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
output.webm".
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Ticket URL: <https://trac.ffmpeg.org/ticket/4025#comment:1>
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