VC-1 is the informal name of the SMPTE 421M video codec standard, which was initially developed as a proprietary video format by Microsoft before it was released as a formal SMPTE standard video format on April 3, 2006. It is today a widely supported standard found in HD DVDs, Blu-ray Discs, Windows Media, Slingbox, and Microsoft's Silverlight framework.
VC-1 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 Part 2. 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 Advanced Profile development and standardization was to support the compression of interlaced content without first converting it to progressive, making it more attractive to broadcast and video industry professionals.
Both HD DVD and Blu-ray Disc have adopted VC-1 as a video standard, meaning their video playback devices will be capable of decoding and playing video-content compressed using VC-1. Windows Vista partially supports HD DVD playback by including the VC-1 decoder and some related components needed for playback of VC-1 encoded HD DVD movies.
Microsoft has designated VC-1 as the Xbox 360 video game console’s official video format, and game developers may use VC-1 for full motion video included with games. By means of an October 31, 2006 update, people can now play all formats of Windows Media Video on the Xbox 360 from a disc, USB storage device, or streaming from their PC via Windows Media Connect\/Windows Media Player 11. This allows anyone to play VC-1 encoded video on the console.
VC-1 is also supported in the PlayStation 3 console and the FFmpeg project includes a free VC-1 decoder.

Audio and video glossary. 2014.

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