[FFmpeg-trac] #8402(undetermined:new): CPU hit 100% when two or three ffmpeg instances transcods webm/vp8

[FFmpeg]

#8402: CPU hit 100% when two or three ffmpeg instances transcods webm/vp8
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             Reporter:  dchang       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by dchang):

 I have tested several major versions one by one. I found the last version
 that works with no high CPU (actually each only uses 3% CPU) for
 transcoding to webm/vp8 is ffmpeg-4.0.2-win64-static.zip.

 After this version, all would hits high CPU even in one ffmpeg instance
 transcoding to webm/vp8. With two more instances, it would immediately hit
 100%, including the today's release: ffmpeg-20191126-59d264b-
 win64-static.zip

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Ticket URL: <https://trac.ffmpeg.org/ticket/8402#comment:11>
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