If an image is 640x480 pixels in 4:3, what is the output in 16:9?

[cortezjaime]

Could anyone help please???

[Epicurus8a]

https://www.videohelp.com/dvd

[edDV]

Be more specific. Output from what?

If you keep aspect ratio constant you can stick a 640x480 frame into a 16:9 853x480 frame with side bars and occupy full height.

[cortezjaime]

Let' say the output resolution of an MPG file.

Mpeg file
640 x 480 in 4:3

Mpeg file
??? X ??? in 16:9..........

[jagabo]

If you mean you want to put a 4:3 image in the middle of a 16:9 anamorphic NTSC DVD: 540x480 with 90 pixel wide pillar bars. That is, 540x480 in a 720x480 frame.

[cortezjaime]

Be more specific. Output from what?

If you keep aspect ratio constant you can stick a 640x480 frame into a 16:9 853x480 frame with side bars and occupy full height.

Of an MPG file. Does it keep the same output resolution? or does it change is so what would that be?

[guns1inger]

For DVD, the output resolution will be 720 x 480 (for NTSC), however this will include black vertical bars to pad out the width (as explained)

[edDV]

But he never mentioned DVD. He started with a square pixel 640x480 and never said what the next step is.

853x480 will keep the same square pixel resolution at 16:9 aspect.

This confusion is why you need to say what you are trying to do.

[cortezjaime]

I'm trying to play an MPEG file on a DV player and I need to know if the file is 640 x 480 in 4:3 will it stay at 640 x 480 in 16:9 or will it change, because the DV player only supports up 720 x 480.

[jagabo]

Frame dimensions (in pixels) and display aspect ratio are indendent variables in MPEG video. Any frame size can be displayed at any aspect ratio. The DVD spec only supports two display aspect ratios: 4:3 and 16:9. In most cases both use 720x480 (NTSC) or 720x576 (PAL) frame sizes.

[edDV]

I'm trying to play an MPEG file on a DV player and I need to know if the file is 640 x 480 in 4:3 will it stay at 640 x 480 in 16:9 or will it change, because the DV player only supports up 720 x 480.

DV or DVD? Both use 720x480, 704x480 (true 4:3) and 352x480 (always 4:3)
https://www.videohelp.com/dvd

To make a standard DVD you need to convert your MPeg file. Most DVD authoring packages like ULead Movie Factory 5 will do this for you during authoring.

If you are just trying to straight play a 640x480 MPeg2 file, some players will do it. You need to experiment because that is outside the standard.

[guns1inger]

Most players will expand it out to 720 x 480 for fullscreen, and adjust PAR to keep the correct proportions. Similarly, if configured correctly, then will pillarbox within a 16:9 frame so the image proportions are retained. Will it be 640 x 480 - probably not, because those dimensions don't mean anything coming out of a DVD player. Will the image look correct ? If the player is any good, yes. I know that is how my player handles files like this.