пн, 8 янв. 2024 г., 05:14 Mark Filipak <[email protected]>:
> 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! > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
