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How can i be sure that right AR is always displayed?
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Pump all videos thru ffdshow and activate the Use overlay mixer (also tag with aspect ratio) option under Output.
There have been examples of videos badly transcoded from DVDs without resampling. Does that stream have an aspect ratio embedded? Is it correct?
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I also got one file, that i'm not sure which AR is correct.
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Try to guess what might have been the source format, then what (wrong) actions the operator might have performed upon the file.