Citando Marc Lavallée <m...@hacklava.net>:
I changed the subject.
Martin, I like your proposal because the chunks in WAV files (as
metadata in source files), could be transferred to transcoded files
an used by players (for example by web browsers). That would enable
the distribution of multi-channel streams in their native format
(Ambisonics, Quad, 5.1, 7.1), with stereo compatibility.
In the IETF proposal , there's also the idea of including an
optional non-diegetic stereo track (or stream); I'm not aware of any
format with a similar feature (as part of the format specification).
- - - -
The idea was possibly adopted from the .TBE format (10 channels),
although Facebook supports Ambix-9 + 2 (11 channels) as well. (By now.)
But be aware that non-diegetic stereo is not a multichannel downmix:
It is a second audio stream, usually used as comment or background
(music) track.
Best,
Stefan
- - - - -
Marc
Le 2018-08-02 à 12:37 PM, Martin Leese a écrit :
Aaron Heller wrote:
There's a IETF proposal from folks at Google for "Ambisonics in an Ogg Opus
Container", based on
Nachbar, et al., Ambix - A Suggested Ambisonics Format. 3rd
International
Symposium on Ambisonics and Spherical Acoustics, Lexington, KY (2011)
and the idea of a default stereo decode from Etienne Deleflie's Universal
Ambisonic work
I would instead recommend my proposal for a
stereo decode described at:
http://members.tripod.com/martin_leese/Audio/stereo_mix_proposal.html
http://members.tripod.com/martin_leese/Audio/StereoMix_chunk.html
This can be used not only in Ambisonic files
(see Example 3 on the Stereo Mix chunk page),
but also in non-Ambisonic multi-channel files.
This makes it more likely to be adopted.
Regards,
Martin
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