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XBMC has been progressing at an incredible otherworldly pace and tonight's latest Changeset is no exception. From Revision 27376 Onwards, XBMC now supports dxva2 decoder support for vc1/h264 courtesy of the Boxee DXVA implementation.  Thats right, my aging Athlon 4400XP now barely hits 20% CPU usage with most 1080p material.

This is for the Windows builds.

Changeset:

added: intial dxva2 decoder support for vc1/h264

Decoder is not enabled by default as it still has issues.

Working:
VC1 has worked for all samples i've tried (not that many)
x264 encoded h264 all seem to work fine

Known issues:
Apple encoded h264 => green screen or corrupt green screen
Raw blueray h264 => weird corruption of bottom half of video

XBMC Announcement.