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Right now I'm using this to try and scale a 720p video down to 480p, the problem is the automatic width is selecting an odd number.

I am currently using -vf "scale=trunc(oh*a*2)/2:480 and it still selects 853 for the width. Any tips?

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Never mind, solved it myself with -vf "scale=trunc(oh*a/2)*2:480" –  Peter Jun 24 '13 at 12:52
You should post that as an answer below. Self-answering is encouraged here. –  Karan Jun 27 '13 at 1:21

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