[FFmpeg-trac] #5152(undetermined:reopened): Broken B frames while copying MPEG-2 ibp without recompression from some point

FFmpeg trac at avcodec.org
Tue Jan 12 14:07:55 CET 2016


#5152: Broken B frames while copying MPEG-2 ibp without recompression from some
point
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  Aleksandr_Slobodeniuk              |                   Status:  reopened
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by Aleksandr_Slobodeniuk):

 1) result must be from 3:00 to 3:24
 2) if you type (it's 25 frames)

 {{{
 ffmpeg -i result.mov %d.jpg
 }}}
 you'll see that
 - first 11 frames show 3:11 (because ffmpeg can't decode 11 b frames
 because they are from the middle of the gop)
 - last 2 frames show 3:24 and 4:01 , 4:00 is missing (because it was not
 read. 4:01 is I frame that goes before 4:00 in the file, and it was pulled
 out with nullptr to avcodec_decode_video)

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5152#comment:12>
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