search for: fuma

...iest (and most important for now) is to disable channel coupling and define the metadata. The allowed number of channels should not be restrained to a list like 1,4,9,16,etc, because ambisonics can support mixed-order schemes. The Ambix format was adopted by Google, but it's a new format; the FuMa format is widely used and could easily be supported as well. https://en.wikipedia.org/wiki/Ambisonic_data_exchange_formats Down-mixing to stereo is a sort of ambisonic decoding; it is simple and could be included in the Opus decoder. But decoding to binaural or 5.1 is not trivial. Usually, decodin...

...le). We reserved actual channel number "C" == 2,3,5,etc so that if mixed order schemes with different basis functions become common in the future, we could add them without breaking existing implementations. > The Ambix format was adopted by Google, but it's a new format; > the FuMa format is widely used and could easily be supported as well. > https://en.wikipedia.org/wiki/Ambisonic_data_exchange_formats Although FuMa conventions are commonly used, the ambix conventions of ACN channel ordering and SN3D normalization are increasingly becoming the norm. FuMa generally uses...

...he explanation. I'm not familiar enough with Ogg, as I was using AAC with the m4a contrainer for my "ambisonics on the web" experiments. I'm now confident that Opus will be largely adopted. > > The Ambix format was adopted by Google, but it's a new format; > > the FuMa format is widely used and could easily be supported as > > well. https://en.wikipedia.org/wiki/Ambisonic_data_exchange_formats > > Although FuMa conventions are commonly used, the ambix conventions of > ACN channel ordering and SN3D normalization are increasingly becoming > the n...

...pling, and bitrate allocation > will not be performed if it is known that the input channels are > ambisonic channels. > > An option that overrides the meaning of the input channels would also > allow a future version to support other conventions if needed, e.g. > "--channels fuma" to convert ambisonic channels from FuMa format, or > "--channels ambix,stereo" / "--channels stereo,ambix" to convert an > input file with non-diegetic stereo either after or before the > ambisonic channels, or to force a particular surround configuration, > or...

Friendly ping for the opus-tools patch... ---------- Forwarded message --------- From: Drew Allen <bitllama at google.com> Date: Mon, Mar 19, 2018 at 2:53 PM Subject: Re: [PATCH] Support for Ambisonics To: opus at xiph.org <opus at xiph.org> On Mon, Mar 19, 2018 at 11:52 AM Drew Allen <bitllama at google.com> wrote: > Hello all, > > Sorry for the delay (got really

...on of the input channels, coupling, and bitrate allocation will not be performed if it is known that the input channels are ambisonic channels. An option that overrides the meaning of the input channels would also allow a future version to support other conventions if needed, e.g. "--channels fuma" to convert ambisonic channels from FuMa format, or "--channels ambix,stereo" / "--channels stereo,ambix" to convert an input file with non-diegetic stereo either after or before the ambisonic channels, or to force a particular surround configuration, or force discrete unpe...

2008/9/25 e deleflie <edeleflie at gmail.com>: > Hi Vorbis-dev, > Hi, > I've been on this list for a couple of weeks, but its been quiet, so I > dont know who is who. > > My name is Etienne Deleflie, I am the creator of www.ambisonia.com, > and I am (together with the Ambisonic community) looking for a > 'delivery format' for Ambisonic data. > >

...ressed PCM data in an Ogg container), which may be related: Our proposal involves only Vorbis. Uncompressed PCM Ambisonics is already well catered for. > It is indeed related. We are proposing a different ambisonic channel scheme (not speaker mapping though) called N3D (different to the usual FuMa scheme). The N3D scheme has a number of 'future proof' advantages, including no extra header info required and support for Higher Orders (up to 6th and beyond). It is also believed that the N3D scheme is more compatible with Vorbis compression. We are asking only for - Mapping = 1 - som...

Where can I find the Header file or whatever which specifies the "Mapping" flag. In feb - apr 2007, there was a lot of discussion about Ambisonics and Monty kindly stated that Mapping = 1 ; Denotes and Ambisonic file as opposed to = 0 which is 1 speaker/ 1 channel Has this been written explicitly into the standard? Which standard should I be looking at?