Hmm, I'm still not quite satisfied with an answer, so let me phrase the question in another way with an example case:
You have T.V. show on an NTSC DVD. The video has 8 pixels of black padding on either size, so you crop them off and are left with a resolution of 704x480. What SAR would you set in this case? 10:11? 8:9? Something else?
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