What's the Relation Between Video Resolution and Aspect Ratio? - digitalFAQ.com Forums [Archives]
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#1
08-09-2005, 06:55 AM
 lbhl Free Member Join Date: Jun 2005 Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts
If a video's resolution is M X N, so the original aspect ratio (no stretch) of this video is M/N?

Why do so many different resolutions apply to the SAME aspect ratio video?

What's on earth the relation between video resolution & aspect ratio?

Don't laugh at a beginner's question. When I do video conversion I see so many different resolutions for AVI with the same aspect ratio.
Someday, 12:01 PM
 Site Staff / Ad Manager Join Date: Dec 2002 Posts: 42 Thanks: ∞ Thanked 42 Times in 42 Posts
#2
08-09-2005, 07:25 AM
 Dialhot Free Member Join Date: May 2003 Posts: 10,463 Thanks: 0 Thanked 0 Times in 0 Posts
Quote:
 Originally Posted by lbhl If a video's resolution is M X N, so the original aspect ratio (no stretch) of this video is M/N?
No.

Quote:
 Why do so many different resolutions apply to the SAME aspect ratio video?
Because the matter is not the A/R of the video, but the A/R of what is exposed on your screen (the image).

A SVCD is 480*480, a DVD is 720*480 or even 352*480 and VCD is 352*240, but they are all 4:3 (or 16:9 for DVDs) because this is the A/R of the picture that you will look at at the end.

Quote:
 What's on earth the relation between video resolution & aspect ratio?
There is none.
It's a fact that people that do avi used to keep the source A/R for the movie they are encoding.
So if the movie is 4:3 then the res will be 640*480 for instance. But they can choose to use a SVCD resolution, why not ? The picture will be 480*480 and of course it will be distort. To look at it you have to restore the original 4:3 A/R.

And this is only the simple aspect of the things, because they are several A/R (pixel A/R for instance...).

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