Dolby Atmos


#28

Iron Man, original US release (UPC 097361438146):

M2TS, 1 video track, 3 audio tracks, 8 subtitle tracks, 2:06:02, 24p /1.001
1: Chapters, 15 chapters
2: h264/AVC, 1080p24 /1.001 (16:9)
3: TrueHD/AC3, English, 5.1 channels, 48kHz, dialnorm: -27dB
(embedded: AC3, 5.1 channels, 640kbps, 48kHz, dialnorm: -27dB)
4: AC3, French, 5.1 channels, 640kbps, 48kHz, dialnorm: -27dB
5: AC3, Spanish, 5.1 channels, 640kbps, 48kHz, dialnorm: -27dB
6: Subtitle (PGS), English
7: Subtitle (PGS), English
8: Subtitle (PGS), French
9: Subtitle (PGS), Spanish
10: Subtitle (PGS), Portuguese
11: Subtitle (PGS), French
12: Subtitle (PGS), Spanish
13: Subtitle (PGS), English

Here’s what the TrueHD stream looks like in mediainfo:

Audio #1
ID : 4352 (0x1100)
Menu ID : 1 (0x1)
Format : AC-3
Format/Info : Audio Coding 3
Commercial name : Dolby Digital
Muxing mode : Stream extension
Codec ID : 131
Duration : 2 s 560 ms
Bit rate mode : Variable
Bit rate : 640 kb/s
Maximum bit rate : 5 247 kb/s
Channel(s) : 6 channels
Channel layout : L R C LFE Ls Rs
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 200 KiB (0%)
Service kind : Complete Main


#29

Another example is the original US release of Air Force One (UPC 043396269514). Both the English and French TrueHD tracks have AC-3 muxed in.

Because TrueHD costs more to put on disc than DTS-HD MA, it’s really hard to find examples unless you have first release older discs. Some of the re-releases have DTS-HD MA instead. Also, TrueHD means at least 5.1, so any catalog title with less than that has to have DTS HD-MA or PCM for lossless.


#30

Interesting, thanks for that information!


#31

Out of curiosity… What makes you say this? Based on that there are no discs out there with less than 5.1 and TrueHD as codec? TrueHD itself can have the same channel layouts that DTS-HD MA supports and I haven’t come across any limitation of the BD/UHD BD specs in that regard.


#32

The Dolby Media Encoder user guide, page 9.

Basically, TrueHD is always 5.1, 7.1, or 2.0 (which I did not remember), with “empty” channels. Also, DTS-HD MA has a lot more channel layouts, even without the “weird” 7.1 options.


#33

It lists all channel layouts from 1.0 up to 7.1. There’s three types of containers though, yes: 2 channels, 6 channels or 8 channels. But the actually delivered channel information (not the container, but the channel layout) can be everything available.

The container doesn’t really matter to the user. The channel information is what the AVR interprets, shows in its GUI and plays back.

But this is going quite OT here… :wink: