[FFmpeg-trac] #6633(undetermined:new): NVENC produces interlaced content that plays incorrectly in Windows Media Player and is read as 59.94fps in MediaInfo

[FFmpeg]

#6633: NVENC produces interlaced content that plays incorrectly in Windows Media
Player and is read as 59.94fps in MediaInfo
-------------------------------------+-------------------------------------
             Reporter:  alexpigment  |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  nvenc,       |               Blocked By:
  interlace, frame rate, 59.94,      |  Reproduced by developer:  1
  1080i, choppy playback             |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 When creating 1080i content with h264_nvenc, the resultant file will not
 play smoothly in Windows Media Player. VLC plays the files particularly
 bad on the systems I've tested when using both Yadif2x and Bob deinterlace
 modes. Kodi plays the files back without issue.

 Secondly, Mediainfo shows the frame rate as being 59.94fps rather than
 29.97fps, although the reported frame rate seems to vary from application
 to application.

 Files produced with libx264 play back correctly in all players test and
 are read as 29.97fps in Mediainfo. Additionally, 1080i files created with
 NVENC in Staxrip do not exhibit a problem.


 How to reproduce:

 {{{
 % ffmpeg -i interlacedsample.mp4 -c:v h264_nvenc -b:v 8000000 -pix_fmt
 nv12 -flags +ilme+ildct -profile:v high -level 41 interlacedoutput.mp4
 }}}

 Play the output file in Windows Media Player; see that the output file is
 not played smoothly but the input file is. Next, open the file in
 Mediainfo and see that the frame rate is being reported as 59.94fps.


 ffmpeg version 3.3.3 static (Zeranoe)
 Nvidia 1050 GPU, driver version 384.76.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6633>
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