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Dolby TrueHD

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TrueHD is a lossless audio format employing the MLP technique. It features 8 channel support at 96kHz/24-bit with a maximum bitrate of 18 Mbps - most movies so far have only used 5 or 6 Mbps of the maximum allowed bandwidth. TrueHD is an optional audio standard for Blu-ray, while it is mandatory for HD DVD. All HD DVD players must be able decode Dolby TrueHD to LPCM up to 2 channels as part of the mandatory specifications, although all current (as of December 2007) HD DVD players will decode up to 8 channels of LPCM through HDMI output.