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Old 1st February 2006, 04:52   #1  |  Link
kotrtim
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Join Date: Dec 2005
Posts: 145
Sample Aspect Ratio calcutions

Source/Encoded Resolution ( X:Y )
Desired Display Resolution/Aspect Ratio ( H:V )

The formula to calculate PAR/SAR

Y X V x H = SAR fraction

for example a NTSC 16:9 with resolution 720:480

480 720 9 x 16 = 1.185185185... (32/27)
therefore the Sample Aspect Ratio that should be keyed in in MeGUI is 32x27

for NTSC 4:3 with resolution 704:480
480 704 3 x 4 = 0.88888...(10/11)
SAR = 10x11

CROPPING without resizing
won't affect the SAR

Any comments on the way I calculate SAR?
I took quite some time to understand that
SAR is actually the ratio of every single pixel..not
the ratio displayed by the video frame
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