7.1 Surround Channels Different in DTS-HD & Atmos Playback

[me02]

Summary of the bug:
7.1 surround audio plays back as 8 discrete channels, but through different speakers when using DTS-HD and Dolby Atmos.
I believe the Atmos playback is correct, if true, the DTS-HD side channels play through the rear speakers and the rear channels play through the side speakers.
How to reproduce:
Play the attached files...

[Elon Musk]

No attached files, someone will just close ticket as invalid.

[Hendrik]

"Believe" is not a very strong feeling, while I have "Channel Identification" samples that come out the appropriate channel just fine.

[me02]

Sorry, couldn't edit the files to make them small enough.
Posted here instead:

​http://firestationstudios.com/7dot1/index.html.

[Carl Eugen Hoyos]

Atmos is not supported by FFmpeg but both your samples play fine here.

Please understand that valid tickets need an FFmpeg command line including complete, uncut console output.

[mkver]

Your atmos file isn't atmos, but PCM in a CAF container. And it seems that what the speaker says and how FFmpeg handles this file are in contradiction for this file, not the dts files. But I don't know if this is a bug in FFmpeg's handling of CAF or if that's just the way your file is.

[me02]

Replying to mkver:

Your atmos file isn't atmos, but PCM in a CAF container. And it seems that what the speaker says and how FFmpeg handles this file are in contradiction for this file, not the dts files. But I don't know if this is a bug in FFmpeg's handling of CAF or if that's just the way your file is.

Thanks! That is most helpful.

[mkver]

And the CAF file doesn't contain the ​channel layout chunk which is mandatory as the number of channels is > 2. This of course implies that FFmpeg (or any other tool) is free to map the channels in the file to any position it sees fit (or even to refuse to play the file at all). And this makes this issue invalid.