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Dolby TrueHD is a lossless, multi-channel audio codec developed by Dolby Laboratories for home video, used principally in Blu-ray Disc and compatible hardware. Dolby TrueHD, along with Dolby Digital Plus (E-AC-3) and Dolby AC-4, is one of the intended successors to the Dolby Digital (AC-3) lossy surround format.
Although commonly associated with the 5.1 channel configuration, Dolby Digital allows a number of different channel selections. The options are: Dolby Digital 1/0 – Mono (center only) Dolby Digital 2/0 – 2-channel stereo (left + right), optionally carrying matrixed Dolby Surround; Dolby Digital 3/0 – 3-channel stereo (left, center, right)
Dolby Laboratories: 1992 ATSC A52:2018 Free DVD players, digital television, Camcorder: FFmpeg, liba52 (decoding only), Aften (encoding only), libavc (2.0 channels max) Theatrical movie presentation, Digital TV service & home-video (personal recorders, DVD, etc.) No No No No ? AC-4: Dolby Laboratories: 2014 ATSC A342:2022-03 Non-free
Newer lossless audio from Dolby Digital Plus, Dolby TrueHD, DTS-HD High-Resolution Audio and DTS-HD Master Audio and speaker systems with more audio channels (such as 6.1, 7.1, 9.1, 9.2, 10.2, and 22.2) were also introduced for a more cinematic feeling.
Cinema 5.1 surround formats include Dolby Digital and DTS. Sony Dynamic Digital Sound (SDDS) is an 8-channel cinema configuration that features 5 independent audio channels across the front with two independent surround channels, and a Low-frequency effects channel.
Dolby Digital Plus is seeing increasing use in digital television systems, particular in cable and satellite systems, as a replacement for Dolby Digital. Many such applications do not take advantage of its higher channel count or ability to support multiple independent programs; instead it is used as a higher-efficiency codec than AC-3.
Dolby Digital Plus is also optimized for limited data-rate environments such as Digital broadcasting. Dolby Digital Live is a real-time hardware encoding technology for interactive media such as video games. It converts any audio signals on a PC or game console into the 5.1-channel Dolby Digital format and transports it via a single S/PDIF ...
Digital 3D is only supported at the container format level in Matroska, [41] MXF [43] and WebM (some stereo modes). [39] M2TS supports Digital 3D as multiple files in a specific file structure for encoding stereoscopic video: MVC stereoscopic data is in .ssif files in the /BDMV/STREAM/SSIF/ directory and require a respective base .m2ts file.