well, i had my biggest problem with "2001: A Space Odyssey" i took my quite a while to figuere the correct ratio out.
it is encoded on the dvd as:
Aspect_Ratio=16:9
Picture_Size=720x576
but you have to crop it in this way:
crop(2,52,-2,-52)
which left me with a ratio of 2,16:1. which is quite a difference to 2,35:1, the value megui proposed...
but also a couple of other movies are not really 2,35:1 some are more close than others, but if i set the par/sar/or whatever value, i want it to be exact!
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