[directshow] fixed math to convert between mili sec & 100 nano units
[directshow]
fixed math to convert between mili sec & 100 nano units


git-svn-id: 0eeae5948e6d2812090bd4f7305b0670ff9fe118@561 17a06da3-8c20-fa79-550f-e9588e724b77

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