What DAR do I choose in these scenarios?

[simcut]

Hi there

Had a quick question about what DAR I should be selecting in MeGUI when encoding in a couple of scenarios:-

I have a segment of a source DVD which MeGUI detects as having an aspect ratio of 16:9 however the video has black borders at the top & bottom, so my avs script for cropping looks as follows:-

crop(0, 64, 0, -58)

What should I then choose in MeGUI as the DAR for it when it comes to encoding? Do I keep it as 16:9 or do I change it to 4:3?

Should I always stick by the rule of whatever DGIndex & MeGUI detect as the aspect ratio, regardless of having to crop out the big black borders at the top & bottom?

I've also had cases where 90% of the content on a DVD is 4:3 with only minimal cropping needed but then there's a scene which has big black borders at the top & bottom, and I'm wondering whether to keep that scene as 4:3 as well or change the aspect ratio (DAR) to 16:9.

This is all when I am using the avisynth script creator function in MeGUI where you choose the Input DAR.

Hope I am making sense, I'm only at a basic level of understanding about this stuff so apologies in advance.

Cheers

[Overdrive80]

Maybe this post should be in newbies. If your DVD is NTSC (SAR=720x480)

After of your crop, dimensions are 720x358=2.01. I doubt much that could be 4:3. More info: http://en.wikipedia.org/wiki/Aspect_ratio_(image)

Maybe you material is:

2.00:1: Original SuperScope ratio, also used in Univisium. Used as a flat ratio for some American studios in the 1950s, abandoned in the 1960s, but recently popularized by the Red One camera system. In 2001 Studio Ghibli used this framing for its animated film Spirited Away.

Of all ways, in your cover of DVD, should have more info about film or http://www.imdb.com/

You have that provide more information.

[Ghitulescu]

without a photo of the video, there can only be wild guesses ...

[Overdrive80]

without a photo of the video, there can only be wild guesses ...

That's exactly what I wanted to suggest. :p

[qwerty1983]

Hi thereI have a segment of a source DVD which MeGUI detects as having an aspect ratio of 16:9 however the video has black borders at the top & bottom, so my avs script for cropping looks as follows:-

crop(0, 64, 0, -58)

What should I then choose in MeGUI as the DAR for it when it comes to encoding? Do I keep it as 16:9 or do I change it to 4:3?

I assume you have a 16:9 letterbox material (4:3 frame with black bars on the top and bottom)

With this assumption in mind we have :

PAL --> 720x576 ___ 576-(64+58) = 454
So you have a resolution of 720x454
Assuming a PAR(pixel aspect ratio) of 16:15
you have a DAR of 720*(16/15):454 ~ 768:454 ~ 1.69:1


NTSC --> 720x480 ___ 480-(64+58) = 358
So you have a resolution of 720x358
Assuming a PAR of 8:9
you have a DAR of 720*(8/9):358 ~ 640:358 ~ 1.78:1

16/9 equals 1.777... which is almost equal to 1.78
You propably have an NTSC DVD

[Overdrive80]

I assume you have a 16:9 letterbox material (4:3 frame with black bars on the top and bottom)

With this assumption in mind we have :

PAL --> 720x576 ___ 576-(64+58) = 454
So you have a resolution of 720x454
Assuming a PAR(pixel aspect ratio) of 16:15
you have a DAR of 720*(16/15):454 ~ 768:454 ~ 1.69:1


NTSC --> 720x480 ___ 480-(64+58) = 358
So you have a resolution of 720x358
Assuming a PAR of 8:9
you have a DAR of 720*(8/9):358 ~ 640:358 ~ 1.78:1

16/9 equals 1.777... which is almost equal to 1.78
You propably have an NTSC DVD

Assuming that his video be anamorphic, does it? Its necessary portion video source.