Dolby TrueHD

Like its predecessor, Dolby TrueHD's bitstream carries program metadata, or non-audio information that a decoder uses to modify its interpretation of the audio data.

Dolby TrueHD metadata may include, for example, audio normalization or dynamic range compression.

Any Blu-ray player or AV receiver that can decode TrueHD can also downmix a multi-channel TrueHD track into any smaller amount of channels for final playback (for example, a 7.1 track to a 5.1 output, or a 5.1 track to a stereo output) by merging discrete channels' signals (except the low-frequency effects channel, the ".1," in a stereo mixdown, which is discarded due to its sound not playing back well without a dedicated subwoofer).

Similar to DTS-HD MA, however, Dolby TrueHD's dual tracks are opaque to the user; a Blu-ray player loaded with a Dolby TrueHD disc will automatically fall back to AC-3 if it cannot decode or pass through the lossless bitstream, with no explicit selection required (or offered).

Universal Pictures Home Entertainment has recently used Dolby TrueHD on occasion.

Dolby TrueHD logo as introduced in 2012.