Albert Leusink wrote:
Hello all,
Coming soon, to a phone near you !:
https://storage.googleapis.com/jump-inspector/Jump_Inspector_Quick_Start.pdf
There will definitely be many user complaints initially due to
misunderstandings as it uses ACN/SN3D ordering and 99% of all the tools (VST
plugins etc..) currently used by the VR community are FuMa / .AMB based...
I certainly would "vote" to keep B format at 1st order, because this is
the already established format for SF mikes and 1st order recordings. As
Albert writes, available 1st order tools use and expect B format.
It is probably a possible or even good idea to use Ambix (ACN ordering,
SN3D) as consistent format for < HOA >.
I believe this proposal is pretty consistent with Mpeg-3DA
standardization, anyway. (Ambisonics in 3DA is mostly about HOA
compression. Not "FOA compression".)
B format for 2nd and 3rd order is not a lot in (practical) use yet, and
could still be replaced by a more general scheme and format.
To insist on a retrospective format change for an in-use format (B
format/FOA) doesn't make a lot of sense at all.
Google has also problems to support 5.1 on YT in any proper or
systematic way. To propose Ambix as 1st order format is caused probably
just by lack of real understanding, and I would assume there was no real
discussion about this subject anyway.
Note that Google supports only "Quad (4.0/4-channel) layout with
ambisonic audio". Nothing else. So, this "thing" is about 1st order, not
HOA (>=2nd order). Google also doesn't give any explicit reason why
AmbiX should be used at 1st order, and not B format.
Who else here uses AmbiX at 1st order? Anybody?!
I don't know why this "Jump Inspector" experiment is supposed to be
based on Mac OS X and "supported high end Android devices", as well. (A
normal "practical" effort would be to support multichannel
audio/Ambisonics in "Android of version number x.y or above".)
Best regards,
Stefan
P.S.:
To add to that confusion, Oculus has just updated their Gear VR video player
specs to accept FuMa first order....
Exactly! They actually < use > Ambisonics, and SF mikes... This case is
not about "experiments", as this VR video player just works. (And
additionally, Oculus has some real and unquestionable technical
expertise in this field...)
I'm sure you have all had this discussion many times over, but what, if any,
are the advantages of 1st order ACN over FuMa?
Not any. So it is probably about convention, tradition. Systematic
consistency is a valid aim - but not if ignoring about 40 years of
former history and practice!
From what I've gathered, ACN was initially proposed as it would allow bigger
file sizes but I don't think that really applies to mobile phones in this
case...doesn't it only make sense to have ACN beyond 3rd order?
AmbiX/ACN maybe at >= 2nd order. B format has been < always > used at
1st order, though.
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