[FFmpeg-trac] #11055(avcodec:reopened): OGOP (Open GOP) in certain conditions may cause missing frames of decoding

[FFmpeg]

#11055: OGOP (Open GOP) in certain conditions may cause missing frames of decoding
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             Reporter:  markfilipak  |                    Owner:  (none)
                 Type:  defect       |                   Status:  reopened
             Priority:  normal       |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  everything   |               Blocked By:
  OGOP                               |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by pdr0):

 Ticket_11055.m2ts is not a valid coded video sequence because it has no
 IDR pictures

 ffrobe/ffmpeg often misidentifies non-key "i" as IDR. All entries of
 ffprobe show_frames key_frame=1 on this sample are wrong

 You can verify with a stream analyzer tool such as Elecard Streameye,
 Codec Visa .

 A free way to verify IDR frames (in display order) you have an Nvidia card
 is DGIndexNV, you can open the dgi file in a text editor. The IDR
 identification results correspond to professional stream analyzer results

 There are frame_num, POC violations - likely errors in processing from
 misidentification  improperly cut GOPs
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11055#comment:184>
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