[FFmpeg-trac] #7690(undetermined:new): FFmpeg QSV decode + VPP performance is just a fraction of what one gets with VA-API and MediaSDK

[FFmpeg]

#7690: FFmpeg QSV decode + VPP performance is just a fraction of what one gets
with VA-API and MediaSDK
-------------------------------------+-------------------------------------
             Reporter:  eero-t       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  qsv          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by eero-t):

 In the original bug report, video is scaled so small that output copy
 doesn't matter.

 Let's let ticket #7943 be about the extra copy (related to later comments
 in this ticket), and this one about the issue in the original bug report.

 I just checked it with the latest media-driver and FFmpeg git versions,
 and one still needs both to:
 * bind FFmpeg to single core (prefix FFmpeg with "taskset 0x1")
 * set fixed GPU frequency

 To get QSV performance close to VA-API performance.  Without those, QSV /
 VPP performance is half of the corresponding VA-API performance.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7690#comment:16>
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