Den 07.01.2024 23:35, skrev Andrew
Randrianasulu:
I
don't quite understand how ffmpeg considers the various
aspect
ratios. However from the site lurkertech you pointed to
(and from
which I had taken some definitions put in the manual) PAR
and SAR are
not the same thing: PAR is about pixel shape and size; SAR
is about
frame shape and size.
To change the manual I would like to be sure that ffmpeg
really
considers PAR=SAR.
lets wait until ffmpeg-users reply to just send
email :)
The wikipedia article section "Confusion with display aspect ratio"
points out:
https://en.wikipedia.org/wiki/Pixel_aspect_ratio#Confusion_with_display_aspect_ratio
Pixel aspect ratio is often confused with different types of image
aspect ratios; the ratio of the image width and height. Due to
non-squareness of pixels in Standard-definition TV, there are two
types of such aspect ratios:
storage aspect ratio (
SAR)
and
display aspect ratio
(abbreviated
DAR, also known as
image aspect
ratio and
picture aspect
ratio). Also,
pixel aspect ratio (
PAR) is
also known as
sample aspect ratio (abbreviated
SAR)
in some industrial standards (such as
H.264[2])
and output of programs (such as
ffmpeg[3]).
Note the reuse of the abbreviations
PAR and
SAR.
This article uses only the terms pixel aspect ratio, display aspect
ratio and storage aspect ratio to avoid ambiguity.
And in Note 3
"ffprobe shows PAR
as SAR". ffmpeg.org.
Retrieved 2022-06-10.
https://trac.ffmpeg.org/ticket/1776