don't know if anyone else does this, but when i get a video file that's not too great in quality, i reduce my screen resolution (from 1152x864 to 800x600) which serves to 'increase' my video quality.
of course, the video quality itself isn't affected, however, the picture is much less stretched, which makes the picture seem better
edit: this is of course assuming you view the videos in full screen mode
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