[FFmpeg-trac] #10622(avcodec:new): AMF encoder uses sleep() function, which is not precise on WIndows

[FFmpeg]

#10622: AMF encoder uses sleep() function, which is not precise on WIndows
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             Reporter:  Evgeny       |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:  avcodec      |                  Version:  git-
                                     |  master
             Keywords:  AMF encoder  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:
 1. AMF encoder has av_usleep(1000) when AMF encoder input queue is full.
 2. Inside av_usleep() function the standalone “sleep()” function is used,
 which is not very accurate on windows OS. For a sleep of 1 ms, we observe
 an actual sleep time of 13 to 14ms.
 3. For low resolution encoding (e.g. 480x360 video) av_usleep() executes
 frequently, so performance degradation is quite big (about 15%).
 4. We will create a patch for fix this performance degradation by changing
 av_usleep(1000) -> av_usleep(0) on Windows OS.

 How to reproduce:
 {{{
 % ffmpeg.exe -y -hwaccel d3d11va -hwaccel_output_format d3d11 -i input.mp4
 -c:v h264_amf out.mp4
 ffmpeg master branch
 built on Windows
 }}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/10622>
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