[FFmpeg-trac] #5440(avcodec:new): nvenc with interlace video never create packets with AV_PKT_FLAG_KEY

[FFmpeg]

#5440: nvenc with interlace video never create packets with AV_PKT_FLAG_KEY
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             Reporter:  maf          |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avcodec      |                  Version:  git-
             Keywords:  nvenc        |  master
  interlace                          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:
 How to reproduce:
 - Create codec with flag AV_CODEC_FLAG_INTERLACED_DCT
 - Encode video
 - look for encoded packet AV_PKT_FLAG_KEY flag.

 Result:
 - Key frame never produced.

 When I disable the interlace flag then key frames are created properly.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5440>
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