Video Quality
While Windows Media Video 7 and 8 codecs were comparable to MPEG-4 ASP in terms of visual quality, Windows Media Video 9 (especially the later SMPTE-compliant VC-1 implementations) is comparable to H.264 Main and High Profile. While WMV9/VC-1 does have certain advantages over H.264 such as support for non-square integer transforms, H.264 is more consistently able to yield better picture quality because it supports multiple reference frames, reference B-frames, context-adaptive binary arithmetic coding (CABAC) and stronger in-loop filtering. H.264's quality advantage is typically more evident at low bitrates.
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