[FFmpeg-trac] #8134(undetermined:new): [FFmpeg-vaapi][encode] caanot setup number of refference frames through `-refs` option

[FFmpeg]

#8134: [FFmpeg-vaapi][encode] caanot setup number of refference frames through
`-refs` option
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             Reporter:  andreyor     |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  ffmpeg-      |               Blocked By:
  vaapi                              |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by wenbinCHEN):

 https://github.com/FFmpeg/FFmpeg/blob/2367affc2cea32f18a4d309835bed57adb1baa94/libavcodec/vaapi_encode.h#L43

 It seems that there is a MAX_PICTURE_REFERENCES that limit the refs.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8134#comment:4>
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