TrueHD

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Dolby TrueHD is a lossless audio coding technology. It is basically a rebadge of Meridian Lossless Packing (MLP) but includes some extensions such as higher maximum bitrate and more channels.

A Dolby TrueHD bitstream can carry up to 14 discrete sound channels. Sample-depths up to 24 bits/sample and audio sample-rates up to 192 kHz are supported. Like the more common legacy codec Dolby Digital (a.k.a. AC3), TrueHD bitstreams carry program metadata. Metadata is separate from the coding format and compressed audio samples, but stores relevant information about the audio waveform. For example, dialog normalization and Dynamic range compression are controlled by metadata embedded in the TrueHD bitstream.