[FFmpeg-trac] #10585(avformat:new): Seeking forward in iPhone video ends up seeking backwards

[FFmpeg]

#10585: Seeking forward in iPhone video ends up seeking backwards
----------------------------------+--------------------------------------
             Reporter:  low-batt  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Summary of the bug:
 Seeking forward by 10 seconds in HEVC video recorded on iPhone causes
 playback to resume at an earlier time.

 This is a regression.

 This report originates from [https://github.com/iina/iina/issues/4502 IINA
 issue #4502]

 Which was then reported to the mpv project in [https://github.com/mpv-
 player/mpv/issues/12047 mpv issue #12047]

 User llyyr found the problem was reproducible with FFplay and identified
 the following commit as introducing the problem:
 [https://github.com/FFmpeg/FFmpeg/commit/ab77b878f1205225c6de1370fb0e998dbcc8bc69
 commit ab77b87]

 A FFmpeg patch has been submitted by llyyr, who cautions this may not be
 the right approach to fix this: [https://ffaux-
 bg.ffmpeg.org/project/ffmpeg/patch/20230923111034.6320-2-llyyr.public at gmail.com/
 patch 20230923111034]

 With that patch I am no longer able to reproduce the seeking backwards
 behavior.

 '''However''' if I let the video play until the end and then start seeking
 back and forth using the arrow keys I can sometimes trigger the following
 error:
 {{{
 FullHD30fps.mov: error while seekingKB vq=    0KB sq=    0B f=0/0
 }}}

 With and without the patch that will also trigger this message:
 {{{
 [hevc @ 0x11ce4df20] Multiple Dolby Vision RPUs found in one AU. Skipping
 previous.
 }}}

 The file used to reproduced the problem can be downloaded from
 [https://img.photographyblog.com/reviews/apple_iphone_13/sample_images/FullHD30fps.mov
 here]

 That file is one of the samples in Photography Blog's
 [https://www.photographyblog.com/reviews/apple_iphone_13_review Apple
 iPhone 13 Review]. Other samples from that review also exhibited the
 problem.

 How to reproduce:
 Start playing the above file with FFplay and as soon as the video starts
 playing press the right arrow key to seek forward 10 seconds. Instead of
 seeking forwards, playback will resume at an earlier time.

 Output was too big to add inline. I will add as an attachment.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10585>
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