4:3 - 16:9 same ??

[Illusionist]

What is the difference between 720x480 (4:3) and 720x480 (16:9) ??

Reason I ask is ? When I convert a 720x480 (4:3) video to 16:9, the movie looks exactly the same on my monitor.

Why does 320x240 convert to 352x240 look exactly the same on my monitor, shouldn't 352x240 be wider at 4:3 ratio ?? Such as when TMPGEnc, converts those resolutions. I'm confused. Thanks for any help.

[edDV]

Magician's trick
It is all about SAR, PAR and DAR vs. square pixels.
Do your research. Truly all is illusion.

[Illusionist]

Thanks for confusing me even more, Lol,. I'll look into it.

[edDV]

PAR = Pixel Aspect Ratio
SAR = Storage Aspect Ratio
DAR = Display Aspect Ratio

They can all be different.

[jagabo]

What is the difference between 720x480 (4:3) and 720x480 (16:9) ??

A flag in the file that tells the player what aspect ratio to display the video at.

This can take the form of a Diplay Aspect Ratio (DAR, the shape of the final picture) or a Pixel Aspect Ratio (PAR, the shape of individual pixels).

DAR = SAR * PAR

Where SAR is the Storate Aspect Ratio, or relative frame dimensions.

[edDV]

For example assuming square pixel display and storage at 704x480 with NTSC 4:3 PAR of 0.9091,

704 * 0.9091 = 640
So square pixel 4:3 display would be 640x480.

NTSC 16:9 PAR is 1.2121
704 * 1.2121 = ~854
So square pixel 16:9 display would be 854x480.

If a 16:9 display had a full screen 1366x768 square pixel rsolution, both horizontal and vertical woul be upscaled 1.6x to fill the screen.

But if a 16:9 display had a full screen 1024x768 resolution (DAR = 0.75), then vertical would be scaled 1.6x but horizontal would be scaled

854 * 1.6 * 0.75 = ~1024

[jagabo]

For example assuming square pixel display and storage at 704x480 with NTSC 4:3 PAR of 0.9091,

704 * 0.9091 = 640
So square pixel 4:3 display would be 640x480.

Or more directly:

SAR = 704/480 = 1.4667
PAR = 0.9091

DAR = SAR * PAR = 1.4667 * 0.9091 = 1.333

[noob4ever]

can someone tell me what side do i need to get to transform 640x480 1:1 ntsc to 16:9 with out that "fat" look, i guess croppin or addin borders but ¿how much?

[jagabo]

640x480 square pixel to 16:9 DVD:

1) Crop 60 lines off top, 60 lines off bottom (or a total of 120 lines, however many top and bottom), resize the remaining 640x360 to 720x480 (NTSC) or 720x576 (PAL).

-- or --

2) Resize to 540x480 (NTSC) or 540x576 (PAL), add 90 pixel wide borders left and right to bring the file back up to 720 pixels wide.

You can use a program like FitCD to get more precise numbers and numbers for other sizes.

[noob4ever]

thanks jagabo

can u tell me if i addborders left n right do i see black lines on left n right when playin on dvd or only the widescreen ones?

[jagabo]

can u tell me if i addborders left n right do i see black lines on left n right when playin on dvd or only the widescreen ones?

Yes, you will see the borders on a 16:9 TV.

[guns1inger]

640 x 480 square pixels to NTSC 16:9 DVD is a simple crop of 60 from the top and 60 from the bottom, then resize up to 720 x 480 and encode as 16:9. Squashing to 540 and adding borders will distort the output.

[jagabo]

Squashing to 540 and adding borders will distort the output.

No it won't. It will give you a 4:3 image in a 16:9 frame. I didn't mean it as two steps, but rather two different ways. I edited the post to make it clearer.