[FFmpeg-trac] #11080(undetermined:new): FFmpeg timestamps do not consistently agree with packet timestamps

[FFmpeg]

#11080: FFmpeg timestamps do not consistently agree with packet timestamps
-------------------------------------+-------------------------------------
             Reporter:  markfilipak  |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by markfilipak):

 Replying to [comment:56 Balling]:
 > This is hierarchy of B frames view. Can be even 4 levels. Again, red
 dots are I frames (well, light blue here, as I selexted it), blue P, green
 B, second layer is done with B frames, 3rd too with B frames. X unit is
 PTS, of course, so the (indeed open) GOP begins with two B frames. The two
 numbers there are DTS/PTS counting from relative numbers not your absolute
 numbers (and both from 0).

 That diagram, https://i.imgur.com/Y9tduBw.png, looks like nonsense to me.
 If time is flowing left-to-right, then the 2nd numbers must be PTSes. If
 that's true, then the 1st numbers must be DTSes. If that's true, then the
 B-frames are being displayed before they're decoded. That seems like
 nonsense to me.


 Here is what Y9tduBw.png shows.
 {{{
 PTS order  B  B  P  B  B  I  B  P
             \__\/    \__\/    \/
             /\  \    /\  \    /\
 PTS order  p  B  B  I  B  B  P  B
             \  \  \  \  \  \  \  \
              69 70 71 72 73 74 75 76
 }}}


 Here is what's actually in Ticket_11055,_cut-5sec..cut.m2ts.
 {{{
 PTS order     B  P  B  B  I  B  P
              ___/  ______/  ___/
             /     /        /
 DTS order  P  B  I  B  B  P  B  P
             \  \  \  \  \  \  \  \
              \  \  \  \  \  \  \  504054813
               \  \  \  \  \  \  504051060
                \  \  \  \  \  504047306
                 \  \  \  \  504043552
                  \  \  \  504039798
                   \  \  504036045
                    \  504032291
                     504024783
 }}}

 Now, I believe that inside Ticket_11055,_cut-5sec..cut.m2ts there's
 I-slices and P-slices and B-slices that reference all over the place. I
 don't know how those work and I'm not showing them in either diagram
 above. I'm only showing the DTSes & PTSes.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11080#comment:57>
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