[FFmpeg-trac] #8437(avcodec:closed): ffprobe: Wrong aspect ratio is reported
FFmpeg
trac at avcodec.org
Mon Dec 23 13:51:28 EET 2019
#8437: ffprobe: Wrong aspect ratio is reported
-------------------------------------+-------------------------------------
Reporter: nafmo | Owner:
Type: defect | Status: closed
Priority: important | Component: avcodec
Version: git-master | Resolution: invalid
Keywords: mpeg2video | Blocked By:
regression |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 1 |
-------------------------------------+-------------------------------------
Changes (by cus):
* analyzed: 0 => 1
* cc: cus (added)
* status: new => closed
* resolution: => invalid
Comment:
I dont think this is an issue in ffmpeg.
The old firmware writes 720x480 to sequence_display_extension, the new
writes 540x480. aspect_ratio_information is 2 for both files which means
4:3.
ISO/IEC 13818-2 states that if sequence_display_extension() is present
then the sample aspect ratio may be calculated as follows: SAR = DAR ×
display_horizontal_size / display_vertical_size
So you should report this to Harmonic instead. Reopen if they can cite
some specs which proves that ffmpeg is wrong in deciding the aspect ratio.
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Ticket URL: <https://trac.ffmpeg.org/ticket/8437#comment:2>
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