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DailyTech - Check those file sizes. 3.5MB for the MP4 and 4.5MB for the FLV. A savings of 22%. Granted, the MP4 is NOT hinted, and hinting will add to the file size, but not an additional 22%. You’ve also got to keep in mind that the Flash Video will get larger

Online Video Publishing: Create Your Own Streaming Internet TV Channel
MasterNewMedia.org - The contents of your channel can be sourced in one of two ways: you can point Streamcast Player directly at Flash video FLV files hosted on your own server, or else direct Streamcast to access video files via a Media RSS feed, either from your own