Some definitions:
The original aspect ratio means the unaltered picture, displayed at the size it was encoded.
Other aspect rations stretch or squeeze the picture (resample it), if the AR doesn't match original.
The easiest way to switch aspect ratio on and off is to use ffdshow to decode all video formats. When you want to display the video as the author intended, choose Overlay mixer as output. To display the video in it's original aspect ration, clear the Overlay mixer checkbox.
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