HD DVD

discontinued optical disc format

industry association that developed the DVD format

advanced lossless multi-channel audio codec

SMPTE 421, informally known as VC-1, is a video coding format. Most of it was initially developed as Microsoft's proprietary video format Windows Media Video 9 in 2003. With some enhancements including the development of a new Advanced Profile, it was officially approved as an SMPTE standard on April 3, 2006. It was primarily marketed as a lower-complexity competitor to the H.264/MPEG-4 AVC standard. After its development, several companies other than Microsoft asserted that they held patents that applied to the technology, including Panasonic, LG Electronics and Samsung Electronics.

lossless audio codec for home theater, extended from the lossy DTS codec

optical disc format based on HD DVD

competition between Blu-ray and HD DVD standards for storing HD video and audio

eight-channel surround audio system commonly used in home theater configurations

accessory for the Xbox 360 console