Log in

View Full Version : Question about aspect ratio and resizing...


CobraX
30th December 2005, 14:26
Hi folks

I don't get it anymore. I've read the page on doom9 about resizing an avi to dvd resolution. It seems pretty logical but still I'm stuck with the following situation:

Imagine you have an avi and you want to resize it to dvd resolution. How do you know if you have to resize it to 16:9 or 4:3 when you don't know which aspect ratio the source originally had? I can use gspott to get the framerate so I know whether I have to resize to PAL or NTSC resolution but that's it (can you also resize a i.e. 23,97 fps movie to a PAL DVD resolution?). How would you resize the following resolutions and please enlighten me why you would do that:

1) 576*320
2) 576*240
3) 512*224

Following this (http://www.doom9.org/mpg/avistretching.htm) guide would give you the follow resizing scripts for resolution 1 if I'm right:

4:3 -> Lanczos4Resize(720,426)
AddBorders(0,74,0,76)

16:9 -> Lanczos4Resize(720,568)
AddBorders(0,4,0,4)

I also want to use this avisynth script with HC Encoder to get a m2v file. If I have to choose the first aspect ratio (4:3) then I also have to check 4:3 as aspect ratio in HC Encoder right? Or doesn't it matter there?

Thanks in advance

CobraX