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<div class="moz-cite-prefix">Den 07.01.2024 23:35, skrev Andrew
Randrianasulu:<br>
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cite="mid:CA+rFky6idAbcrsorwj8-rNZqPpnyDG_kX_4haORYD=QPKFouCQ@mail.gmail.com">
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<div dir="ltr" class="gmail_attr">пн, 8 янв. 2024 г., 01:31
Andrea paz <<a
href="mailto:gamberucci.andrea@gmail.com"
moz-do-not-send="true" class="moz-txt-link-freetext">gamberucci.andrea@gmail.com</a>>:<br>
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style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I
don't quite understand how ffmpeg considers the various
aspect<br>
ratios. However from the site lurkertech you pointed to
(and from<br>
which I had taken some definitions put in the manual) PAR
and SAR are<br>
not the same thing: PAR is about pixel shape and size; SAR
is about<br>
frame shape and size.<br>
<br>
To change the manual I would like to be sure that ffmpeg
really<br>
considers PAR=SAR.<br>
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<div dir="auto">lets wait until ffmpeg-users reply to just send
email :)</div>
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<br>
The wikipedia article section "Confusion with display aspect ratio"
points out:<br>
<a class="moz-txt-link-freetext" href="https://en.wikipedia.org/wiki/Pixel_aspect_ratio#Confusion_with_display_aspect_ratio">https://en.wikipedia.org/wiki/Pixel_aspect_ratio#Confusion_with_display_aspect_ratio</a><br>
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: <i>storage aspect ratio</i> (<i>SAR</i>)
and <i><a href="https://en.wikipedia.org/wiki/Display_aspect_ratio"
title="Display aspect ratio">display aspect ratio</a></i>
(abbreviated <i>DAR</i>, also known as <i><a
href="https://en.wikipedia.org/wiki/Image_aspect_ratio"
class="mw-redirect" title="Image aspect ratio">image aspect
ratio</a></i> and <i><a
href="https://en.wikipedia.org/wiki/Picture_aspect_ratio"
class="mw-redirect" title="Picture aspect ratio">picture aspect
ratio</a></i>). Also, <i>pixel aspect ratio</i> (<i>PAR</i>) is
also known as <i>sample aspect ratio</i> (abbreviated <i>SAR</i>)
in some industrial standards (such as <a
href="https://en.wikipedia.org/wiki/Advanced_Video_Coding"
title="Advanced Video Coding">H.264</a><sup id="cite_ref-2"
class="reference"><a
href="https://en.wikipedia.org/wiki/Pixel_aspect_ratio#cite_note-2">[2]</a></sup>)
and output of programs (such as <i><a
href="https://en.wikipedia.org/wiki/Ffmpeg" class="mw-redirect"
title="Ffmpeg">ffmpeg</a></i><sup id="cite_ref-3"
class="reference"><a
href="https://en.wikipedia.org/wiki/Pixel_aspect_ratio#cite_note-3">[3]</a></sup>).
Note the reuse of the abbreviations <i>PAR</i> and <i>SAR</i>.
This article uses only the terms pixel aspect ratio, display aspect
ratio and storage aspect ratio to avoid ambiguity.<br>
<br>
And in Note 3<br>
<span class="reference-text"><cite class="citation web cs1"><a
rel="nofollow" class="external text"
href="https://trac.ffmpeg.org/ticket/1776">"ffprobe shows PAR
as SAR"</a>. ffmpeg.org<span class="reference-accessdate">.
Retrieved <span class="nowrap">2022-06-10</span></span>.<br>
<a class="moz-txt-link-freetext" href="https://trac.ffmpeg.org/ticket/1776">https://trac.ffmpeg.org/ticket/1776</a><br>
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