It shows 25 to 35% bitrate reduction, and it's a document meant to promote Mpeg4 over Mpeg2, so I think I'll prefer my figures.
Anyway, the document claims a 50-66% bitrate reduction for AVC and it's an overstatement. 50%, perhaps, 66%, never.
Quote:
For video distributed over the internet: legitimate, illegitimate, or both MPEG-4 has been quite popular.
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Legitimate ? where ? I can see WMV, VP6, RV, MOV ( h264, sorenson, and sometimes Mpeg4 SP ). But nothing else.
I still stand by my point of view : mpeg4 sp/asp only broke through for illegitimate distribution.