[FFmpeg-trac] #9497(undetermined:closed): ffmpeg reports wrong display aspect ratio (DAR) for matroska files.

FFmpeg trac at avcodec.org
Sat Nov 6 08:27:31 EET 2021


#9497: ffmpeg reports wrong display aspect ratio (DAR) for matroska files.
-------------------------------------+-------------------------------------
             Reporter:  Rikitiki     |                    Owner:  (none)
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  wontfix
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by Gyan):

 * status:  new => closed
 * resolution:   => wontfix

Comment:

 Matroska stores
 [https://www.matroska.org/technical/elements.html#DisplayWidth
 DisplayWidth and DisplayHeight]. ffmpeg stores Sample Aspect Ratio in its
 internal contexts. The former is the effective ratio of the displayed
 dimensions. The latter is the 'scale factor' to be applied to the decoder
 output for processing or display purposes. When converting the former to
 SAR, rounding may occur. Which in turn, may lead to a slightly different
 DAR computed by ffmpeg.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9497#comment:1>
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