FB also have their own specs, and some info can be found here 
(without a FB account):
https://facebookincubator.github.io/facebook-360-spatial-workstation/

--
Marc

On Tue, 24 Oct 2017 08:30:54 -0400, I wrote:
> Hi Oliver.
> 
> To my knowledge there's nothing special about muxing more than 2
> channels of audio with a video stream. Once a video file and a
> multi-channel audio file are ready to mux, FFmpeg can do it (MP4Box
> is also useful for MP4 streams). About mixing codecs: there's cases
> where the MKV container is required; for example, H-264 + Opus, but I
> could be wrong. What I found difficult (3 years ago) was to prepare
> and render multi-channel audio streams and save them in the AMB
> format, but now I suppose there's more options.
> 
> I did not know about VLC3 and its ambisonics support.
> But I can see here:
> https://twitter.com/m4gsoft/status/890127816842465280
> That the support is based on Google specs:
> https://github.com/google/spatial-media
> I guess that the produced files can also be decoded to speaker arrays.
> 
> P.S.2: I'd be trilled to consult the FB page that Umashankar
> suggested, but it requires a login and I'll never get a FB account.
> So any useful info found on FB should be forwarded to
> non-big-brothered repositories. --
> Marc
> 
> Le Tue, 24 Oct 2017 12:03:02 +0100
> Oliver Larkin <olilar...@googlemail.com> a écrit:
> 
> > Hi All,
> > 
> > Is anyone is aware of a good resource that will help me learn about
> > muxing video with ambisonic audio? I don’t have much experience with
> > audio for video full stop and I am confused about what is possible
> > with different codecs. I haven’t been able to find comprehensive
> > info online. I would like to know what video formats/containers for
> > both audio and video i can use to distribute video + HOA audio
> > (although knowing about what’s possible for FOA audio would also be
> > great). Web based playback is what this is really for, but I would
> > also like to know about high quality options for downloads, since
> > VLC 3 does TOA. Not sure if this will allow a custom decoder or if
> > it’s just for binaural.
> > 
> > Sorry for a bit of an open ended question, but if anyone has any
> > tips i’d really appreciate it.
> > 
> > Thanks!
> > 
> > Oli
> > 
> > 
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