Bit Rate Throttling, an IIS Media Services extension, saves money on network costs by metering the download speed of media and data files. For media, Bit Rate Throttling accomplishes this by automatically detecting the encoded bit rates of 11 common media formats, such as Windows Media Video (WMV), Flash Video (FLV), and MPEG 4 (MP4), and then throttling the response to the client. For any other file or MIME type, Bit Rate Throttling allows administrators to configure custom throttling rules.
Bit Rate Throttling saves network bandwidth costs by controlling the rate at which media is delivered over HTTP. The throttling rate can be configured using server-side rules or by automatically adjusting the download rate for detected media files based on format and encoded bit rate. When Bit Rate Throttling is not used, content is downloaded at the maximum possible speed. If an end user drops off after watching 20% of a video clip, the hoster would have paid bandwidth for content that was never watched.