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Usage: ARChange.exe -i mp4-file -t track-no [-a width:height]
The track-no is the video track #. You can get it with mp4info. For mp4 files made with Nero Recode, I think it's always 3.
To display the current A/R:
ARChange -i test.mp4 -t 3
To change it to 8:9
ARChange -i test.mp4 -t 3 -a 8:9
A 4:3 DVD source has a PAR of 8:9 because it is 4/3 * 480/720
For a 16:9 DVD source, it's 32:27.
--h
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