[FFmpeg-user] sntsc

[Andrew Randrianasulu]

пн, 8 янв. 2024 г., 05:14 Mark Filipak <markfilipak.imdb at gmail.com>:

> On 1/7/24 17:34, Andrew Randrianasulu wrote:
> >
> > Well, we (cinelerra-gg users/hackers/maintainers) run into aspect ratio
> > issues too , and I tried to demistify it for myself ... only to run into
> > much more complex explanation at
> >
> > https://lurkertech.com/lg/pixelaspect/
>
> I'm sorry, I couldn't get past the first sentence: "Pixels in the graphics
> world are square."
> They probably meant "dots" (aka "pels"). But I've read enough squirrely
> things in my time to know
> squirrely when I read it. My experience is that things that start
> squirrely get squirrelier.
>
> Some video folks who are stuck in analog TV write about 704x480 and
> 704x576 and 10:11 SAR and 59:54
> SAR, and they talk about overscan. It's all nonsense. DVDs are not TV and
> never was.


I guess early on they were meant to be displayed on TVs among other things
....



So, folks with
> analog TVs didn't see 720x480 because some of it got into the horizontal
> blanking. So what? There
> were no such SARs as 10:11 & 59:54. "59:54" isn't right even if 704
> existed.
>
> Some of those people who write those squirrely things, and more, write
> them into standards. It's all
> still nonsense. What is it that you want to know?
>

I think I like to try and see bigger picture behind acronyms.

At least this page explains how some 640*480 files  might be born (it
should be 486, but some lines are cut).

https://lurkertech.com/lg/video-systems/#480i

This is all interesting and not really theoretical to me because at least
one our user still have a lot of HDV and DV material and he hopes to get
correct encoding results in those cases too!





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