DVD-Video content, which can include LPCM, Dolby or DTS material, and even video, makes the disc compatible with all DVD players. The high-resolution, Packed PCM audio encoded using MLP is only playable by DVD players containing DVD-Audio decoding capability. A common configuration is a single-sided DVD with content in both the DVD-Video (VIDEO_TS) and DVD-Audio (AUDIO_TS) directories. Since the DVD-Audio format is a member of the DVD family, a single disc can have multiple layers, and even two sides that contain audio and video material. Some discs also include a native Dolby Digital 2.0 stereo, and even a DTS 96/24 5.1-channel, audio track. Many DVD-Video players also offer the option to create a Dolby MP matrix-encoded soundtrack for older surround sound systems lacking Dolby Digital or DTS decoding. To address this, most DVD-Audio discs also contain DVD-Video compatible data to play the standard DVD-Video Dolby Digital 5.1-channel audio track on the disc (which can be downmixed to two channels for listeners with no surround sound setup). 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
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