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afterdawn.com > forums > archived forums > mpeg-1 and mpeg-2 encoding (avi to dvd) > tmpgenc aspect ratio problems
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TMPGenc Aspect Ratio Problems
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Tagg
Junior Member
_ 		6. April 2006 @ 13:54 _ Link to this message    Send private message to this user   
I'm using TMPGenc (Xpress) to convert an AVI file to DVD MPEG-2 (specifically 16:9, NTSC). The problem is, the AVI video is in an incorrect aspect ratio of 640x352, and I need to convert this to a 624x352 (1.78) ratio on the DVD.

Naturally, I cannot directly do the math with TMPGenc, because the aspect of 720x480 isn't actually what the DVD converts to for viewing. Normally, I just use the "Full Screen: Keep Aspect Ratio" option. However, I cannot do that with this (because the source file is the incorrect AR), and I cannot figure out what the 720x480 ratio should be. I've come up with 702x480, but I'm not sure if this is correct...

Can anyone help?

Thanks.
[ + quote]
"With great power comes great responsibility."
aldaco12
AfterDawn Addict
_ 		7. April 2006 @ 03:12 _ Link to this message    Send private message to this user   
Quote:
and I need to convert this to a 624x352 (1.78) ratio on the DVD
I disagree with you.

A trick which can always be applied:
1) have VirtualDub's frameserver installed (double click on auxsetup.exe, in VirtualDub's directory and click on 'install handler')
2) open your AVI with VirtualDub
3) Do Video___Filter___Add --> Resize and configure it this way:
New Width: X'=720 (standard DVD's width)
New Height: Y'=(720/X)*Y (720/640*352 in your case) = 396
Filter Mode: Lanczos3 (for me it's the best. Probably also 'Precise Bicubic' is good, but I feel very fine with the Lanczos filter)
4) check 'expand frame and litterbox image' and set
Frame Width: 720 (NTSC standard)
Frame Height: 480 (NTSC standard; it would be 576, for PAL).
By default it will be filled black, which is very fine. --> [OK]
5) Do File___Start Frameserver and save 'movie.vdr' as frameserver, keeping VirtualDub hidden in the system's tray.
6) Load movie.vdr instead of movie.avi with your favorite encoder (maybe you'll have to enter '*.*' or the 'movie.vdr' manually, if the application looks for a video file by default)
[ + quote]

This message has been edited since posting. Last time this message was edited on 7. April 2006 @ 03:16
rebootjim
AfterDawn Addict
_ 		7. April 2006 @ 08:00 _ Link to this message    Send private message to this user   
Even easier. Set (on advanced tab) source 1:1 VGA, keep aspect ratio 2.
Set (on video tab) 720x480 4:3 display.
Tmpgenc will letterbox it correctly.
[ + quote]
Black holes are where God divided by zero...
Cheers, Jim
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Tagg
Junior Member
_ 		7. April 2006 @ 10:57 _ Link to this message    Send private message to this user   
Thanks for the help, guys. =)

aldaco, I think your method will work, but I'd have to use 720x406 to get it into a 1.78 ratio (this is correct, right?).

And rebootjim, I'm not sure that they will work for me, because the source file does have the correct AR (and I want to convert to a 16:9 DVD file).
[ + quote]
"With great power comes great responsibility."

This message has been edited since posting. Last time this message was edited on 7. April 2006 @ 10:57
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