With the introduction of the DVD-Audio format, some kind of backward compatibility with existing DVD-Video players was desired, although not required.
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DVD-Audio may also feature menus, text subtitles, still images and video, plus in high end authoring systems it is also possible to link directly into a Video_TS directory that might contain video tracks, as well as PCM stereo and other "bonus" features. Downmixing can only be done to two-channel stereo, not to other configurations, such as 4.0 quad. If no native stereo audio exists on the disc, the DVD-Audio player may be able to downmix the 5.1-channel audio to two-channel stereo audio if the listener does not have a surround sound setup (provided that the coefficients were set in the stream at authoring).
In uncompressed modes, it is possible to get up to 96/16 or 48/24 in 5.1, and 192/24 in stereo. Channel/resolution combinations that would exceed this need to be compressed. The maximum permissible total bit rate is 9.6 Megabits per second. For example, the front speakers could be 96/24, while the surrounds are 48/20.Īudio is stored on the disc in Linear PCM format, which is either uncompressed or losslessly compressed with MLP (Meridian Lossless Packing). Also, the channels of a track can be split into two groups stored at different resolutions. For instance, a DVD-Audio disc may contain a 96 kHz/24-bit 5.1-channel audio track as well as a 192 kHz/24-bit stereo audio track.
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DVD-Audio release of Rumours by Fleetwood Mac