???? ???? WMV ???? ????? ???? ?????? ??????? Windows Media Video codec ?-Windows Media Audio Codec.

??? ????? ???? WMV ? QT, ?? ?????? ?? ??? QuickTime ? QuickTime DirectShow ????.

???? WMV ???? Qt ??? ???? ????? ????? WMV. ??? Qt ?????, ????? ???? ??????? ???? ????? ?????? bitrate,audio bitrate ?????, ????????, ??? '?????? ????? ????? ?????.

?? ?????? ?? ???? ????? ????? ??? ????? ?-High Definition 1280x720 (720p) ?? 1920x1080 (1080p) ??????, ??? ??? ??????? ?????, ??? ???? ????? ? WMV HD Qt.

H.261 ??? ?????? ????? ????? ???????? ????? ??????? ????? ?? ???-ITU-T ???? ???????? ????? ???????? ????? ?-ISDN. ?? ???? ?? ?????? ?? ?????? ???? ??? ??? ???????? ?? ????? ?????? ???? MPEG-1, MPEG-2/H.262 ?-H.263. H.261. ?? ?? ???? CIF ??????? QCIF ?????? ?? ??? ????? ?? ????? ?????? ???? ????, ???? ????? Acer ?????, ????? Acer ??? ???? ?????. ??? ??? H.261 ??? ????, ????? ????? ?????? ?? ?????.

H.263 ??? ?????? ?? ??? ITU-T ?????? ??? ???? ?????? ????. ????? ???????? ???? ???? ????? ??? ???? Bitstream, ??? ?? ???? ??? ???? ???. ?? ???, ?? ????? ???? ?????? ???????? H.261.The ????? ?? H.263 ??? ??? ?? H.261.but ?? ????? ??? ??????. H.263 ???? ????? ????? ???? ?????? ????? ???? H.261 ????? ?? ???? ????? ????? ?????; H.263 ???? ???? ???????? consultable ??? ???? ?? ????????.

???? ????? ????? H.261 ?? H.263, WMV ???? h.261/h.263 ???? ????? ????? WMV.