On 2020-09-30 13:09, Mark Filipak (ffmpeg) wrote:
I seek your comments regarding the following glossary entries (that
have been reformatted to fit email). Kindly take your time.
-Mark.
DAR (display aspect ratio [1]) [noun]: 1, … as a minimized, H:V,
integer ratio (e.g.
16:9, 4:3)…
(and similar wording for PAR and SAR):
Is the term "minimized aspect ratio" already used in this domain? If
not, then the related mathematics term "reduced fraction" may be a
better inspiration than "minimized". See
<https://mathworld.wolfram.com/ReducedFraction.html>. "Reduced aspect
ratio"? "Ratio where the two numbers have a greatest common divisor of 1"?
Also,
SAR [noun]:…
[2] A standardized set of picture sizes & aspects has been
established:
display DAR picture PAR SAR = DAR/PAR
16:9-2160: 3840 x 2160 16:9 : 3840 x 2160 16:9 : 1:1
4:3-2160: 2880 x 2160 4:3 : 2880 x 2160 4:3 : 1:1
16:9-1080: 1920 x 1080 16:9 : 1920 x 1080 16:9 : 1:1
4:3-1080: 1440 x 1080 4:3 : 1440 x 1080 4:3 : 1:1
16:9-576: 1024 x 576 16:9 : 720 x 576 5:4 : 64:45
4:3-576: 768 x 576 4:3 : 720 x 576 5:4 : 16:15
16:9-480: 853 x 480 16:9 : 720 x 480 3:2 : 32:27
4:3-480: 640 x 480 4:3 : 720 x 480 3:2 : 8:9 [3]
The formatting of the email garbles the table [2] enough that I can't be
sure what I'm reading. Maybe insert printable delimiters into each line?
Best regards,
—Jim DeLaHunt
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