[FFmpeg-trac] #9810(avformat:new): packet->pts skips forward after a seek

[FFmpeg]

#9810: packet->pts skips forward after a seek
-------------------------------------+-------------------------------------
             Reporter:  oneway       |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avformat
              Version:  unspecified  |               Resolution:
             Keywords:  seek, jump,  |               Blocked By:
  skip                               |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Description changed by oneway:

Old description:

> Summary of the bug:
> I used ffmpeg-107064-g7adeeff91f UTC compile date: 2022-04-05 to
> reproduce this bug.
> How to reproduce:
> {{{
> ./ffplay -seek_interval 20 skips_after_seek.m4a
> ffplay version: ffplay-106494-g1291568c98
> built on 2022-04-05
> }}}
>
> Start playing and press right arrow once to seek 20 seconds. At ~30s, the
> playback time and audio will jump to ~40s, In my application, I noticed
> the packet->pts jumps correspondingly after call to av_read_frame().
>
> This only happens with some files, I have only one example from a user so
> far, but my application receives a fair amount of complaints about this.
> It didn't happen with older versions of ffmpeg, probably < 4.0.

New description:

 Summary of the bug:
 I used ffmpeg-107064-g7adeeff91f UTC compile date: 2022-04-05 to reproduce
 this bug.
 How to reproduce:
 {{{
 ./ffplay -seek_interval 20 skips_after_seek.mp3
 ffplay version: ffplay-106494-g1291568c98
 built on 2022-04-05
 }}}

 Start playing and press right arrow once to seek 20 seconds. At ~30s, the
 playback time and audio will jump to ~40s, In my application, I noticed
 the packet->pts jumps correspondingly after call to av_read_frame().

 This only happens with some files, I have only one example from a user so
 far, but my application receives a fair amount of complaints about this.
 It didn't happen with older versions of ffmpeg, probably < 4.0.

 Here is a link to the sample file used to reproduce:
 https://drive.google.com/file/d/1UMSQSxdgat-
 hibQcctJTVWb6RX9g0QG6/view?usp=sharing

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Ticket URL: <https://trac.ffmpeg.org/ticket/9810#comment:5>
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