[FFmpeg-trac] #11055(undetermined:new): "showinfo", "-show_frames": bad PTS, where "framecrc" had expected; plus inconsistent playback

[FFmpeg]

#11055: "showinfo", "-show_frames": bad PTS, where "framecrc" had expected; plus
inconsistent playback
-------------------------------------+-------------------------------------
             Reporter:  markfilipak  |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  vf_showinfo  |               Blocked By:
  ffprobe -show_frames OGOP          |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by MasterQuestionable):

 * Attachment "Ticket_11055.m2ts.xml" added.

 ͏
 https://streams.videolan.org/ffmpeg/incoming/11055/Ticket_11055.m2ts\\
 ͏    (~ 14.77 MiB; M2TS: H.264 (AVC) video, 4.129 s, 23.976 FPS VFR (avg:
 12.836, min: 0.499, max: 23.981), 1920x1080, YUV 4:2:0, ~ 13.58 MiB; DTS-
 HD MA audio, Mono, 4.085 s, 48,000 Hz, 24-Bit, ~ 525.41 KiB; ... ~ 691.57
 KiB)\\
 \\
 ͏    `ffprobe -v warning -hide_banner -threads 0 -show_entries "frame"
 -select_streams v:0 -of "xml" "Ticket_11055.m2ts" -o
 "Ticket_11055.m2ts.xml"`\\
 \\
 ͏    Note:\\
 [[
 {{{#!xml
             <tags>
                 <tag key="timecode" value="01:00:14:22"/>
             </tags>
             <side_data_list>
                 <side_data type="SMPTE 12-1 timecode">
                     <side_datum key="side_data_type" value="SMPTE 12-1
 timecode"/>
                     <timecodes>
                         <timecode value="01:00:14:22"/>
                     </timecodes>
                 </side_data>
             </side_data_list>
 }}}
 ]]\\
 ͏    [/attachment/ticket/11055/Ticket_11055.m2ts.xml#L279 Alike] repeating
 for each frame. [/attachment/ticket/11055/Ticket_11055.m2ts.xml#ref-1
 "[1]"]\\
 \\
 ͏    Area of interest starts from
 [/attachment/ticket/11055/Ticket_11055.m2ts.xml#L227 Line 227]. (Frame
 [/attachment/ticket/11055/Ticket_11055.m2ts.xml#L225 #18], ts:
 5602.235667)\\
 \\
 ͏    The video has bad timestamps:\\
 ͏    |1| Frame [/attachment/ticket/11055/Ticket_11055.m2ts.xml#L264 #21]
 (ts: 5602.360789): would last ~ 2 s due to the next frame's PTS. (frames
 intermediate undetected due OGOP?)\\
 ͏    |2| Frame [/attachment/ticket/11055/Ticket_11055.m2ts.xml#L641 #50]
 (ts: 5605.405489) onward: timestamps format unexpectedly changed, leading
 to interpreted PTS overlap.\\
 \\
 ͏    Points of interest:\\
 ͏    |1| For Frame [/attachment/ticket/11055/Ticket_11055.m2ts.xml#L4 #1]
 - [/attachment/ticket/11055/Ticket_11055.m2ts.xml#L628 #49]: all have both
 PTS, DTS present. ([/attachment/ticket/11055/Ticket_11055.m2ts.xml#L641
 #50] - [/attachment/ticket/11055/Ticket_11055.m2ts.xml#L680 #53] only
 PTS)\\
 ͏    |2| Frame [/attachment/ticket/11055/Ticket_11055.m2ts.xml#L277 #22]
 (ts: 5604.362778) has DTS, PTS identical.\\
 ͏    |3| The last frame
 ([/attachment/ticket/11055/Ticket_11055.m2ts.xml#L342 #27], ts:
 5604.571322) of [/ticket/11055#comment:48 exceptional] DTS-PTS time
 difference is I-frame.\\
 ͏    |4| 5604.362778 - 5602.360789 ≈ 1/23.976 * (99 - 53 + 2)\\
 ͏    |5| 5605.4889 - 5605.405489 ≈ 1/23.976 * 2\\
 \\
 ͏    Among the detected frames there was no sign of OGOP (Open GOP).\\
 ͏    (all !`pict_type="I"` have !`key_frame="1"`; nor any H.264 (AVC)
 recovery point SEI side data present)\\
 ͏    See also:
 https://www.google.com/search?hl=en&gl=ca&num=10&q=%22Open+GOP%22+detect\\
 \\
 [ [1][=#ref-1]\\
 ͏    Brilliant example of bulky engineering and unnecessary sophistry...\\
 ͏    https://edlmax.com/SMPTETimeCodeConversion.htm ("Text Formats")\\
 ͏    .\\
 ͏    That whose existence cannot be justified: let which exist not. ]
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11055>
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