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When your source is a 4:3 NTSC DVD with small black borders left and right, its PAR is probably ITU i.e.4320:4739 = 0.909709034.
- When you encode to mpeg4/AVC and crop the 2x8 borders the SAR should be 10:11 for the cropped 704x480 picture
- When you want to encode blu-ray compliant you should leave it as 720x480 and encode at SAR 10:11, and probably get a 2.4% AR error on HW player/TV,
or crop to 704x480 and resize to 720x480 and encode at SAR 10:11 (for blu-ray compliance).
For better advice upload a sample.
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