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With a 5.1 soundtrack, Dolby Digital will use a datarate of 384k, 448k, or 640k.
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Introduced in 2006, Dolby TrueHD competes with DTS-HD for high-definition Blu-ray audio formats. Before drawing any conclusions, you need to be aware that there are multiple versions of Dolby Digital in use, each of which use a different datarate. Providing up to 14 discrete sound channels in the complete specification, TrueHD used in Blu-ray movies delivers stereo at 192 kHz and up to eight channels (7.1) at 96 kHz. It is used in home theater like Blu-ray disc player and A/V receiver, which is considered to supersede AC3 (Dolby Digital). Also called "DD+" and "Enhanced AC-3" (E-AC-3).
#DOLBY DIGITAL VS DOLBY TRUEHD PLUS#
Part of the Blu-ray specification, Dolby Digital Plus supports higher bit rates than EX. Formerly "Dolby Digital Surround EX," the first film to use this enhanced version of Dolby Digital was "Star Wars: Episode I - The Phantom Menace," in 1999.ĭolby Digital Plus - 6.1 and 7.1 Channels Dolby Digital employs Dolby's AC-3 coding and compression technology (see AC-3).Ĭo-developed with Lucasfilm THX, Dolby Digital EX adds one or two matrixed rear center channels. See Dolby Surround and surround sound.įive discrete channels of audio plus subwoofer (see surround sound).
#DOLBY DIGITAL VS DOLBY TRUEHD MOVIE#
Introduced in the movie "Batman Returns" in 1992, Dolby Digital has been the most widely used surround sound system in the world. It's really annoyingĮac3to "C:\Users\User\Desktop\00466.m2ts" "C:\Users\User\Desktop\ out.thd"Įac3to "C:\Users\User\Desktop\00466.m2ts" "C:\Users\User\Desktop\ out.Dolby DigitalA family of digital audio encoding technologies from Dolby used in movie theaters, home theaters and video games. Mkvmerge can't mux the TrueHD / Atmos that contain AC3/DD5.1 core, it just can mux the TrueHD / Atmos stream and the AC3/DD5.1 core stream separately. > The fact, not all TrueHD / Atmos contain AC3/DD5.1 core, it's because: The ac3 encode sounds louder & more like dts (in crash scene) than the ac3 core TrueHD/AC3 (Atmos), 7.1 channels, 48kHz (embedded: AC3, 5.1 channels, 448kbps, 48kHz, dialnorm: -27dB)Įac3to "C:\Users\User\Desktop\00466.m2ts" "C:\Users\User\Desktop\out.thd+ac3"Įac3to "C:\Users\User\Desktop\out.thd+ac3" "C:\Users\User\Desktop\core.ac3"įfmpeg -y -threads 12 -loglevel fatal -i out.thd+ac3 -ac 23 -ar 48000 -f sox - | sox -multi-threaded -ignore-length -S -t sox -t sox - | ffmpeg -y -threads 12 -f sox -i -b:a 448k -ac 6 -ar 48000 encode.ac3įfmpeg -i out.thd+ac3 -c:a ac3 -ac 6 -b:a 448k -r:a 48000 encode_2.ac3 Does ffmpeg normalise? That'd tend to increase the volume a little. If I'm re-encoding multichannl audio as multichannel audio I tend not to change the volume in the process. If you open the thd+ac3 extracted file with MKVMergeGUI it shows two individual streams, so it's kind of like the thd+ac3 are together in a container which is in turn inside the m2ts file on the disc. It shows a single TrueHD stream you can extract with a thd+ac3 extension, with a thd extension or with an ac3 extension, and that gives you both thd+ac3 together, just the TrueHD or just the AC3 respectively. I haven't worked with much TrueHD audio but if you open a Bluray title using MeGUI's HD Streams Extractor (a GUI for eac3to). So I can switch between the DD5.1 and Dolby True at the touch of a button. I use the analog out from the bluray since I have an older processor but also have the digital out hooked up. I sure do especially the center channel and surrounds. So if a Bluray title was to contain only Dolby audio, it'd have to contain AC3 as it's one of the compulsory formats.Ĭhances are some of the budget model Bluray players only supported the compulsory formats, at least in the early days. just wondering if people notice a difference between the sound on blu ray vrs dvd for movies. The newer formats, Dolby Digital Plus and DTS-HD High Resolution (lossy) and Dolby TrueHD and DTS-HD Master Audio (lossless) are all optional. BD-ROM titles must use one of those types for the primary soundtrack. Plus for Bluray there's three compulsory formats all players must be able to decode.