[FFmpeg-trac] #8402(ffmpeg:new): CPU hit 100% when two or three ffmpeg instances transcods webm/vp8mpeg

[FFmpeg]

#8402: CPU hit 100% when two or three ffmpeg instances transcods webm/vp8mpeg
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             Reporter:  dchang  |                     Type:  defect
               Status:  new     |                 Priority:  normal
            Component:  ffmpeg  |                  Version:  4.2
             Keywords:          |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
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 When two (Windows 7) or three (Windows 10) ffmpeg instances independently
 and simultaneously transcode and output to webm/vp8, the computer would
 hit 100% CPU.

 Killing one would restore another one to its normal CPU usage.

 ffmpeg version git-2019-11-22-89aa134

 The command line is:

 ffmpeg.exe -i rtsp://[url1] -f webm -r 20 -s 640x400 -vcodec vp8
 clip1.webm

 ffmpeg.exe -i rtsp://[url2] -f webm -r 20 -s 640x400 -vcodec vp8
 clip2.webm

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