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Windows Media Encoding Script includes filters that enable you to improve the quality of telecined and interlaced content for playback on progressive-scan displays or to maintain the interlacing in content for playback on interlaced playback devices. By default, no filters are applied (-v_preproc 0). You should use the no filter command with content that is already in a progressive-scan format and that will be rendered in a progressive-scan display.
If your audio content is primarily voice combined with some music, you can use the -a_content and -a_contentedl options to optimize the content for voice.