Resize Help

[KnightWalker30]

i am using Virtualdub and got to resize 640x480 to fit on to the tv screen...now how would i be able to fit a 704x396 to the tv screen

[paglamon]

You can resize using the resize filter.But going from 704x396(AR=1.77) to 640x480(AR=1.66) will mess up the aspect ratio and you will get a distorted picture.The correct size would be 640x360(AR=1.77).

[KnightWalker30]

MMMMMAAAAAANNNNNN it fits like a charm thanks for the help...
is there a guid that will help me get the right aspect ratio for standard TV's

[paglamon]

You don't need a guide. You just need a calculator.

[KnightWalker30]

LMAO really, man i thought it would be little complex cause i kept searching all i got it would ruin the quality and what not...so how would you do it. and would it be the same number for all sizes or different

[paglamon]

1.Determine the aspect ratio of the source(16:9 or 4:3 or 1.85 etc.)
2.Encode ur avi using the RESIZE filter in VD. Here specify the size keeping in mind the original aspect ratio.
Example: Original AR=1.85
U want the avi to have an width of ,say,640 pixels.
So,640/height=1.85
Hence height = 640/1.85 = 346
But XviD requires height or width to be multiples of 16. So rounding off 346 to the nearest multiple of 16 we get 336 or 352.
So u shd encode at 640x336 or 640x352.

Hope I have not confused you.