how to identify 4:3 and 16:9 aspect ratio in AVI?

[Fred©]

Hy,

I have downloaded many AVI movies from internet and I want to convert them into VCD, CVD or SVCD... well, files are ALWAYS in non standard format, like 560x304 format and so on...

well, i will use DVD2SVCD or just TMPGEnc to convert files into standard CVD, VCD and SVCD format... question is:

How do I know the movie I downloaded is ripped in 4:3 or 16:9 format, in order to setup DVD2SVCD or TMPGEnc the correct aspect ratio?

Thanks,

Fred©

[Conquest10]

you can tell by looking at it. if its looks wider than your monitor, then it is 16x9 or 2.35:1.

[Fred©]

you can tell by looking at it. if its looks wider than your monitor, then it is 16x9 or 2.35:1.

I speak portuguese ... not sure If understood your message... wider than my monitor????

Fred©

[Conquest10]

your monitor should be 4:3. if the video looks wider than your monitor is wide...

[Fred©]

your monitor should be 4:3. if the video looks wider than your monitor is wide...

does "my monitor" means my TV set?

If yes, I think I was not clear enough... I want to know BEFORE encoding, not AFTER encoding... All I want is: to open / find the properties of an AVI file and recognize, the same time (in my computer), if it was originally ripped in 4:3 or 16:9, to convert it the same aspect ratio...

thanks for your help, anyway...

Fred©

[nkuperw]

There are two possilbe ways. First, find the ratio. Take your ratio (in your example you used 560x304) The lengh (560) / height (304) gives you a ratio of 1.84. A 16:9 ratio is 1.77 and a 4:3 ratio is 1.33. So, a 560x304 is closer to a 16:9 (off by 4%) so you can be safe in assuming that the original rip is in 16:9.
A second way is to use a program called aspect. I don't remember where I got it from, but it will calculate for you aspect ratio's and what dimensions you need for a perfect resolution (and a bitrate calculator as well).

Hope this helps.

[Fred©]

There are two possilbe ways. First, find the ratio. Take your ratio (in your example you used 560x304) The lengh (560) / height (304) gives you a ratio of 1.84. A 16:9 ratio is 1.77 and a 4:3 ratio is 1.33. So, a 560x304 is closer to a 16:9 (off by 4%) so you can be safe in assuming that the original rip is in 16:9.
A second way is to use a program called aspect. I don't remember where I got it from, but it will calculate for you aspect ratio's and what dimensions you need for a perfect resolution (and a bitrate calculator as well).

Hope this helps.

Thanks man,

that was the instruction I was looking for... Now I have learned and will use it for ALL videos...

Fred©

[Vejita-sama]

None of the above statements are 'incorrect' but there's a lot more going on than that. There are three DARs that you're likely to deal with:

1:1 PC
4:3 standard TV
16:9 film and widescreen TV

Under the 16:9 flag there are several ratios
1.85:1 academy flat
2.35:1 anamorphic widescreen
1.77:1 widescreen TV

A correctly encoded PC video ALWAYS has a DAR of 1:1. It doesn't matter what the source WAS, once it's correctly encode for your PC it's DAR is 1:1. The problem is that a lot of d/loaded Divx/xvids are NOT correctly encoded. The file has a DAR of 1:1 but the aspect ratio is off.

So even thou you should be able to divide the width/height it doesn't always work out. But it really doesn't matter if you want to encode to VCD/CVD/SVCD.

VCD/CVD/SVCD have a DAR of 4:3 ONLY. (DVDs can be flagged as 4:3 or 16:9). You can have TMPGenc do all the resizing/converisons for you:

1) Load your favorite template
2) Click on settings
3) Click on the advance tab
4) Under source select VGA 1:1
5) Under video arrange method choose "full screen (keep aspect ratio)"
6) Encode

This will cause TMPGenc to center your video and have it take up the full video width, it will then letter box as necessary to maintain the source aspect ratio.

In other words if your DivX file is not correctly encoded you'll still get a correct VCD/CVD/SVCD letterboxed as necessary to correct that.

[Fred©]

None of the above statements are 'incorrect' but there's a lot more going on than that. There are three DARs that you're likely to deal with:

...

A correctly encoded PC video ALWAYS has a DAR of 1:1. It doesn't matter what the source WAS, once it's correctly encode for your PC it's DAR is 1:1. The problem is that a lot of d/loaded Divx/xvids are NOT correctly encoded. The file has a DAR of 1:1 but the aspect ratio is off.

...

VCD/CVD/SVCD have a DAR of 4:3 ONLY. (DVDs can be flagged as 4:3 or 16:9). You can have TMPGenc do all the resizing/converisons for you:

1) Load your favorite template
2) Click on settings
3) Click on the advance tab
4) Under source select VGA 1:1
5) Under video arrange method choose "full screen (keep aspect ratio)"
6) Encode

This will cause TMPGenc to center your video and have it take up the full video width, it will then letter box as necessary to maintain the source aspect ratio.

In other words if your DivX file is not correctly encoded you'll still get a correct VCD/CVD/SVCD letterboxed as necessary to correct that.

Thanks vejita-sama. Your topic helped me a lot, but now I have another doubt: I also want to learn ripping the correct way.

So, lets suppose I use DVD2SVCD or Smartripper to create an DivX AVI. How should I setup these software to rip a DVD, to create an DVD/VCD/SVCD ready AVI?

Also: Can you translate DAR?

Thanks a lot,

Fred©

[Vejita-sama]

DAR - Display aspect ratio Take alook at these two links:

This one gives a breif overview of DAR and how it works:

http://www.doom9.org/aspectratios.htm

This one explains how anamorphic DVDs work and why letterboxing is/was necessary to display a 16:9 film on a 4:3 TV:

http://www.thedigitalbits.com/articles/anamorphic/aspectratios/widescreenorama.html

If you're a newbie and want to make DivX files check out Gordian Knot (freeware at http://www.doom9.org). It's a software package (sort of like DVD2SVCD) that comes with a ripper, besweet, dvd2avi, toolame, huffyuv, nandub, etc. There are guides and a discussion forum for the program.

It's pretty easy. It's 'main menu' allows you to select everything and it sets the final DivX size for you (even has a calculator to give you bitrate vs. resolution quaility info).

[Fred©]

Thanks again,

I am printing those pages right now... then I will translate them into portuguese...

Fred©

[funkguy4]

None of the above statements are 'incorrect' but there's a lot more going on than that. There are three DARs that you're likely to deal with:

1:1 PC
4:3 standard TV
16:9 film and widescreen TV

Under the 16:9 flag there are several ratios
1.85:1 academy flat
2.35:1 anamorphic widescreen
1.77:1 widescreen TV

A correctly encoded PC video ALWAYS has a DAR of 1:1. It doesn't matter what the source WAS, once it's correctly encode for your PC it's DAR is 1:1. The problem is that a lot of d/loaded Divx/xvids are NOT correctly encoded. The file has a DAR of 1:1 but the aspect ratio is off.

So even thou you should be able to divide the width/height it doesn't always work out. But it really doesn't matter if you want to encode to VCD/CVD/SVCD.

VCD/CVD/SVCD have a DAR of 4:3 ONLY. (DVDs can be flagged as 4:3 or 16:9). You can have TMPGenc do all the resizing/converisons for you:

1) Load your favorite template
2) Click on settings
3) Click on the advance tab
4) Under source select VGA 1:1
5) Under video arrange method choose "full screen (keep aspect ratio)"
6) Encode

This will cause TMPGenc to center your video and have it take up the full video width, it will then letter box as necessary to maintain the source aspect ratio.

In other words if your DivX file is not correctly encoded you'll still get a correct VCD/CVD/SVCD letterboxed as necessary to correct that.

What resize method does TMPGEnc use? Unless it does a Precise Bicubic or better resize, I'm sticking with my frameserving from VDub and doing the resize manually (I know how to so don't worry).