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this is a good question.
recently i did a test, encoding the same 60 second video file in both mpg and wmv.
for a given file size the wmv DOES look better to my eyes. i alt tagged the thumbnail with "click here for short video wmv file" or "click here for short video mpg file"
admittedly my test was only for a week, but all other traffic during the week was steady.
the mpg file had about 30% more click throughs.
moral of the story---i am using only mpg samples at this moment.
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