QT is file extension of Apple QuickTime media format. QT functions as a multimedia container file that contains one or more tracks, each of which stores a particular type of data: audio, video, effects, text, or subtitles.  

WMV file contains video and audio streams respectively using Windows Media Video codec and Windows Media Audio codec.

To convert QT to wmv file, please install the QuickTime Player and QuickTime Directshow filter.

Download WMV Converter which can convert qt to wmv file. Select a qt file, change some parameters such as the video encoding bitrate,  audio encoding bitrate, resolution, frame rate etc if necessary.

If set the customized size to watch high definition in 1280x720 (720p) or 1920x1080 (1080p) resolutions, and increase bit rate, you may convert qt to wmv HD.


H.261 is the first practical digital video coding standard designed by ITU-T to develop conference TV and video telephony on ISDN. It becomes the design framework of later International Standard of Video Coding including MPEG-1, MPEG-2/H.262 and H.263. H.261. It only deals with CIF and QCIF image formats by dividing every frame into images layer, Acer block group layer, Acer block and block layer. H.261 output rate is constant, while the image quality is unsteady.

H.263 is the standard draft of ITU-T designed for low bit-stream communications. Actually the standard could be used in broader bitstream scope but not limit to low bit-stream. Whatís more, itís thought to be used to replace H.261.The coding algorithm of H.263 is the same with that of H.261.but thereíre still some differences. e.g. H.263 adopts semi-precision for motion compensation while H.261 adopts all pixel accuracy and filtering cycle; H.263 contains four consultable options to improve performance.

After install H.261 or H.263 decoder, wmv converter can convert h.261/h.263 to wmv file.

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