ASF is Advanced Streaming Format. It is an extensible file format developed primarily for storing synchronized digital video, audio, subtitle streams, or transmitting data on the internet. ASF is also a multimedia container of Windows Media Video or Windows Media Audio.

To convert DAT to asf file, if the dat file is encoded with mpeg1.0 format, you do not need to install any additional dat decoder. If the dat file is encoded with mpeg1.1 or 2.0 format, please install DVD players which include the appropriate dat codec. Please ensure the *.dat file is video file and Windows Media Player can play it because many other files also use this kind of extension. VISTA has bundled DAT 1.1/2.0 decoder.

Download ASF Converter which can convert dat to asf file. Select a dat file, Change the output format to ASF in the Options dialog box, configure some parameters such as the video encoding bitrate, audio encoding bitrate, resolution, frame rate etc if necessary.

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. What’s more, it’s thought to be used to replace H.261.The coding algorithm of H.263 is the same with that of H.261.but there’re 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, asf converter can convert h.261/h.263 to asf file.