[FFmpeg-trac] #9197(undetermined:new): DNG - aspect ratio suddely changes mid-clip

FFmpeg trac at avcodec.org
Wed Apr 21 15:55:19 EEST 2021


#9197: DNG - aspect ratio suddely changes mid-clip
-------------------------------------+-------------------------------------
             Reporter:  Eugene       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 In a DNG (image2) -> H.264 (libx264) transcode, the output aspect ratio
 and frame alignment suddenly changes around frame 12

 First 12 frames (as expected, but off color):
 [[Image(https://i.imgur.com/83Fs2Ya.png)]]

 Frames 13 onwards (layout distorted):
 [[Image(https://i.imgur.com/tvD8K2N.png)]]


 How to reproduce:

 Simple repro (25 frames, all identical):
 https://www.dropbox.com/s/556rltwsukogc4q/ffmpeg-repro.tgz?dl=0

 {{{ffmpeg -stats -f image2 -start_number 0 -i
 D001_C001_20200907_R0%04d.dng -f mp4 -vcodec libx264 -y -s 1280x720
 -pix_fmt yuv420p out.mp4}}}

 Tested with ffmpeg 4.2, 4.4 and 4.5-dev (git-2021-03-20-c361fa9), also the
 same result with a different output encoder and format.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9197>
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