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720x480 v 720x486

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Oscar Gotti720x480 v 720x486
by on Mar 2, 2016 at 10:09:10 pm

Hello,

All my source footage is 1920x1080, and so is my finished edit. My delivery specs for SD give me the option of either:

1- exporting 720x480
2- exporting 720x486

Am I right in thinking the only difference here is that option 2 will give me slightly better quality? Why would they give me the choice between these two rather than just give me one?

Thanks,
Mayto


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Chris BorjisRe: 720x480 v 720x486
by on Mar 2, 2016 at 10:16:29 pm

A few years back SD was delivered a lot and 480 was usually from DV sources.

486 was from professional source like Betacam etc..

pick whatever works for you.



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Oscar GottiRe: 720x480 v 720x486
by on Mar 2, 2016 at 10:44:52 pm

But will 720x486 be better quality when downscaling from HD?


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Chris BorjisRe: 720x480 v 720x486
by on Mar 2, 2016 at 11:31:37 pm

I doubt it would make any real difference.

both are non-square with one having 6 lines more.



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Shane RossRe: 720x480 v 720x486
by on Mar 3, 2016 at 1:30:18 am

[Oscar Gotti] "But will 720x486 be better quality when downscaling from HD?"

Not at all. But I'd choose this format for accuracy sake. Only DV is 720x480. Normal SD is 720x486.

Shane
Little Frog Post
Read my blog, Little Frog in High Def


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Oscar GottiRe: 720x480 v 720x486
by on Mar 3, 2016 at 12:06:00 pm

But surely those 6 extra pixels will add to quality when downscaling a HD video?


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Tero AhlforsRe: 720x480 v 720x486
by on Mar 3, 2016 at 12:29:04 pm

[Oscar Gotti] "But surely those 6 extra pixels will add to quality when downscaling a HD video?"

Not really. But you were given that resolution as an option so if that helps you sleep better then you can use that.


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Oscar GottiRe: 720x480 v 720x486
by on Mar 3, 2016 at 1:03:02 pm

surely more pixels = better quality? even if it's a slight difference in quality surely those extra 6 pixels will make it better quality? If not, can you explain why?

Thanks


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Tero AhlforsRe: 720x480 v 720x486
by on Mar 3, 2016 at 1:55:44 pm

Because six pixels is insignificant unless you are making videos for ants. That = symbol is five pixels tall, how much information can you put in six lines? Also in this case those lines will be in the upper and lower edge that aren't usually the focal point in a video.


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Jeff PuleraRe: 720x480 v 720x486
by on Mar 3, 2016 at 2:54:17 pm

"Better quality" infers that the entire image will "look better". As in less compression for instance, and/or much higher resolution.

In the case of 480 vs. 486, adding a couple of lines to the top/bottom of the screen (which may be hidden behind the TV bezel anyway) makes no difference in the "quality" of the image overall. There is NO CHANGE to the original 480 lines, you are just adding a couple more lines to them.

As mentioned, 720x480 is used for "Digital" video, meaning DV/DVCAM tape or DVD for instance. The NTSC D1 broadcast standard is 720x486, coming off analog tape for example.

Thanks

Jeff Pulera
Safe Harbor Computers


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Jon DoughtieRe: 720x480 v 720x486
by on Mar 3, 2016 at 3:09:48 pm

What Tero said.

It is a difference. But a difference that makes no difference is no difference. It will not be a difference you can differentiate.

The choice of 720x480 had to do with early digital (as opposed to analog)video for broadcast. 704 (with the frame padded to 720x480) pixels were deemed necessary to match the horizontal visual resolution of high quality studio analog video. 480 was chosen because it's the nearst mod16 size that can capture all the resolution of the 486 scan lines of NTSC video (6 are cropped away).

It's one of those little oddities that came along in the transition between analog and digital.

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