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

FFmpeg trac at avcodec.org
Sat Jun 15 23:41:45 EEST 2024


#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            |
-------------------------------------+-------------------------------------
Comment (by markfilipak):

 Replying to [comment:59 Balling]:
 > LOL, your file is horrible, use state of the art software, it has bugs
 too though

 I got DVBinspector installed.

 DVBinspector looks questionable.

 Zoom in on packets 0..10531. DVBinspector's graph shows packet 3 with PTS
 1:33:21.5266. It should also show DTS 1:33:21.4015. It doesn't.

 Let's look at the first four frames:
 packet 3, an I-frame
    PTS: 504137396 -> 1:33:21.5266[2..]
    DTS: 504126135 -> 1:33:21.4015
 packet 3509, a B-frame
    PTS: 504129888 -> 1:33:21.4432
 packet 7015, a B-frame
    PTS: 504133642 -> 1:33:21.4849[1..]
 packet 10531, a P-frame
    PTS: 504148657 -> 1:33:21.6517[4..]
    DTS: 504137396 -> 1:33:21.5266[2..]

 In packets 3..10531 there's 2 DTSes and 4 PTSes -- I'm looking right at
 the PESes. DVBinspector's graph shows no DTS and 3 PTSes.

 I don't really know what you folks are doing, but it looks to me that
 you've 'tuned' FFmpeg to whatever DVBinspector shows. That DVBinspector is
 questionable is a problem for FFmpeg, I think.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11055#comment:68>
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