Формат WMV9 на мой взгляд лучше жмет чем DivX и другие реализации MPEG-4.
VC-1 - Wikipedia, the free encyclopedia:
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VC-1 is the informal name of the SMPTE 421M video codec standard. On April 3, 2006, SMPTE announced the formal release of the VC-1 standard as SMPTE 421M. Its most popular implementation is Windows Media Video 9.
It is an evolution of the conventional DCT-based video codec design also found in H.261, H.263, MPEG-1, MPEG-2, and MPEG-4. It is widely characterized as an alternative to the latest ITU-T and MPEG video codec standard known as H.264/MPEG-4 AVC. VC-1 contains coding tools for interlaced video sequences as well as progressive encoding. The main goal of VC-1 development and standardization is to support the compression of interlaced content without first converting it to progressive, making it more attractive to broadcast and video industry professionals.
Although widely considered to be Microsoft's product, there are actually 15 companies in the VC-1 patent pool (as of 17 August 2006). As a SMPTE standard, VC-1 is open to implementation by anyone, although implementers are hypothetically required to pay hefty licensing fees to the MPEG LA, LLC. licensing body (or directly to its members who hold essential patents on the format, since it is a non-exclusive licensing body).
Both HD DVD and Blu-ray Disc have adopted VC-1 as a mandatory video standard, meaning their video playback devices will be capable of decoding and playing video-content compressed using VC-1. Windows Vista will partially support HD DVD playback by including the VC-1 decoder and related components needed for playback of VC-1 encoded HD DVD movies.
The FFmpeg project is working on a free implementation of this codec.