about Windows Media Encoder "is a freely downloadable media encoder developed by Microsoft which enables content developers to convert or capture both live and prerecorded audio, video, and computer screen images to Windows Media formats for live and on-demand delivery."
For example : AVI (Audio Video Interleave) file has good quality but AVI size is often too large so it takes up alot of space on your computer or takes so much time to upload video files. With Windows Media Encoder, it will convert AVI files in to WMV (Window media video) with smaller file size and good quality. And ofcourse it is easier and saves your time uploading files like upload to YouTube.
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