[FFmpeg-trac] #7227(undetermined:new): `skip_frames nokey` not working correctly for some videos

[FFmpeg]

#7227: `skip_frames nokey` not working correctly for some videos
-------------------------------------+-------------------------------------
             Reporter:  Hett         |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 `skip_frames nokey` not working correctly for some videos

 How to reproduce:
 {{{
 ffprobe -v error -select_streams v:0 -skip_frame nokey -show_frames
 ~/Downloads/Marco.Polo.S01E05.720p.mkv

 [FRAME]
 media_type=video
 stream_index=0
 key_frame=1
 pkt_pts=0
 pkt_pts_time=0.000000
 pkt_dts=N/A
 pkt_dts_time=N/A
 best_effort_timestamp=0
 best_effort_timestamp_time=0.000000
 pkt_duration=41
 pkt_duration_time=0.041000
 pkt_pos=7364
 pkt_size=2043
 width=1280
 height=640
 pix_fmt=yuv420p10le
 sample_aspect_ratio=1:1
 pict_type=I
 coded_picture_number=0
 display_picture_number=0
 interlaced_frame=0
 top_field_first=0
 repeat_pict=0
 color_range=tv
 color_space=unknown
 color_primaries=unknown
 color_transfer=unknown
 chroma_location=unspecified
 [/FRAME]

 }}}

 Out contain only one frame.
 Run ffprobe without `skip_frames nokey` frames will be recognized
 correctly:

 {{{

 $ ffprobe -v error -select_streams v:0 -show_frames
 ~/Downloads/Marco.Polo.S01E05.720p.mkv | grep key_frame=1
 key_frame=1
 key_frame=1
 key_frame=1
 key_frame=1
 key_frame=1
 ^C

 }}}


 Version: `ffmpeg-git-20180521-64bit-static`

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Ticket URL: <https://trac.ffmpeg.org/ticket/7227>
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