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

FFmpeg trac at avcodec.org
Mon Jun 24 02:15:00 EEST 2024


#11055: OGOP (Open GOP) in certain conditions may cause missing frames of decoding
-------------------------------------+-------------------------------------
             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            |
-------------------------------------+-------------------------------------
Comment (by markfilipak):

 Replying to [comment:151 MasterQuestionable]:

 > ͏    Note it's "Non-monotonic":

 What's non-monotonic?

 > ͏
 https://github.com/search?type=code&q=repo:FFmpeg/FFmpeg+/(?:%5B%5CW_%5D|^)Non%5B%5C-%20%5Dmonotonic/

 What is that?

 > ͏    See also:
 > ͏
 https://github.com/FFmpeg/FFmpeg/blob/ed9363052f4b8b89ed2f1415f392d39788dab0d3/libavformat/avformat.h#L481

 Why are you showing me source code?

 > ͏    "packets muxed", "packets read" may indicate.
 > ͏    Compare the packet count of "-f framecrc" alike (or ? Packet
 Analyzer).
 >
 > ͏    Change "-c copy" to "-c rawvideo":
 > ͏    For "-c copy" on "Ticket_11055.m2ts" reports "99 packets muxed".

 Yes. There are 99 TS packets that contain PID 4113 (i.e., 0x1011) PS
 packs.

 I created a table of all that information in the "Summary of the bug". It
 took me two weeks to figure out what happened. I put it all in a table so
 you folks would see it with minimal time and effort. I hope I didn't waste
 those two weeks.

 MasterQuestionable, you are not utilizing the "Reply" link, so I don't
 know what you're replying to. Are you replying to a previous message?
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11055#comment:154>
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