similar to: Ambisonic?

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?

Hi all, My apologies for the confusion ... but I am re-naming this thread again because the proposal doesn't come from Ambisonia. As the founder of Ambisonia I have only been 'mediating' between some members of the ambisonic community ... so it would be wrong to associate the spec with Ambisonia. To clarify. This is what the spec proposes: - that Mapping = 1 means the contents are

Richard Lee wrote: > But there is a caveat. Does Vorbis coupling preserve "phase" relations? Any references explaining this in simple detail? Sebastian : >"coupling" is a rather loose term in the sense that it doesn't exactly specify HOW it's done. It can be understood as the opposite of coding channels independently. Obviously there are many ways to do

>Yesterday I have finished writing the ambisonic pan filter for oggenc. May I ask what this "pan filter" is? I made some tentative suggestions for coupling Ambisonic B-format in a post "Vorbis Ambisonic coupling" on 4feb07 I gather from the last monthly meeting, that some of you, including Monty, had problems with the phase behaviour of B-format. Would anyone like a

On Sat, 28 May 2016 16:21:33 -0700, Michael Graczyk <mgraczyk at google.com> wrote : > Hi Marc, Hi Micheal. > On Sat, May 28, 2016 at 10:44 AM, Marc Lavallée <marc at hacklava.net> > wrote: > > I subscribed because your discussion on the IETF draft ("Ambisonics > > in an Ogg Opus Container") was mentioned on the sursound list. > > Thanks for

Since the opusenc and opusinfo changes were independent I split them up and landed the opusinfo changes (with updated mapping family numbers). - Mark On Thu, Sep 6, 2018 at 4:22 AM, Mark Harris <mark.hsj at gmail.com> wrote: > Hi Drew, > > Sorry for the delay. > > FYI the patch that you attached is not your latest version. This > thread that you replied to is an older

Hi Flac Developers, My name is Etienne Deleflie, I'm the founder of http://www.ambisonia.com and, more recently, http://soundofspace.com. Myself and the community I serve are looking for a lossless file format that can encapsulate ambisonic encoding. To this end a specification has been drafted, and is nearing stability, that describes practical features designed to get the most out of

>I have been giving some thought to how to include Ambisonics in Ogg Vorbis. As I understand it, mapping type = 1 was meant from the start to indicate an Ambisonic stream. The only other information required is the number of channels which thanks to Mr Leese's clever trick tells us exactly which Ambisonic channels are used up to 3rd order. __________________ >The channel coupling

Hi Opus list. I subscribed because your discussion on the IETF draft ("Ambisonics in an Ogg Opus Container") was mentioned on the sursound list. I tried Opus for ambisonics more than a year ago. It does works with uncoupled channels (I had to patch the encoder). I don't know what else could be done to optimize support for ambisonics, as I'm not a codec expert. So I think that

On Oct 4, 2009, at 16:48, James Cloos wrote: > I always thought that the best way to put ambisonic media in flac > was to > use an ogg container, with the 0-order w channel in one flac > stream, the > three first-order channels in a second flac stream, the five second- > order > channels in a third flac stream and the seven third-order channels > in a > forth flac

> Also, there has been some recent work on channel mappings for OggPCM (uncompressed 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

On 2/28/07, Ivo Emanuel Gon?alves <justivo@gmail.com> wrote: > On 2/28/07, Ralph Giles <giles@xiph.org> wrote: > > Well, there are todo pages at wiki.xiph.org, but I meant more in the > > community folklore sense. My point is a roadmap doesn't help much unless > > there are people committed to making things happen. That's been the > > problem with a

On 2/28/07, Ivo Emanuel Gon?alves <justivo@gmail.com> wrote: > On 2/28/07, Ralph Giles <giles@xiph.org> wrote: > > Well, there are todo pages at wiki.xiph.org, but I meant more in the > > community folklore sense. My point is a roadmap doesn't help much unless > > there are people committed to making things happen. That's been the > > problem with a

All, Progress has been made on the proposed draft spec for integrating ambisonics into vorbis. We are not yet finished (should be soon), but you can see the progress here: http://docs.google.com/Doc?id=df4dtw69_3626qqq6st The issue we have hit now concerns how/who would implement the encoding and decoding in Vorbis Tools. Because ambisonics uses spherical harmonic components, an ambisonic file

This patch adds top level functions to create an ambisonic multistream encoder. The implementation currently just calls the analogous surround sound functions with channel mapping 255 to create an encoder that bundles uncoupled streams. Forthcoming patches will actually set channel bitrate and other configuration. My main concern is that adding additional

> I assume, somewhere, someone has a compendium of recommended hardware for ambisonics? Something to sanity check/inform equipment selections of someone building My First Ambisonics Rig? Not at all Monty. This is an important question and I am ashamed to say I can't point you to a good answer. In the meantime, have a look at Permananent Ambisonic Systems from

"Gabriel I." wrote: > Greetings, > > I apologize if I posted this in the wrong list, I wasn't sure where to post > it, but seeing as the tags are called "vorbis comments" I thought vorbis, > rather than ogg-dev, would be the right choice. (actually, I'm not even a > developer anyway) Hi Gabriel, I doubt whether the Xiph community would promote a

Hi everyone, Over the last two weeks or so, I've been thinking about how to add surround sound to Ogg -- and more than that, to do it in the best way possible. With this in mind, I started considering using Ambisonic surround sound. The advantages of this format are considerable: a) It was developed in the early to mid '70s, so the patents should be expired by now.

Hello Tim and others, Thanks for your help explaining this process on IRC. I wrote out a first draft in the RFC xml format. I have attached the xml (labeled as xml.txt so it will appear inline) and the rendered txt files. Please let me know where I can make improvements. I will upload this draft to the IETF datatracker and send it out to codec@ after addressing your comments. -------------- next

Hello, We (Google) have been experimenting with configuration and adjustments to CELT-only Opus that give good results for compressing ambisonic audio signals [1]. Based on our results so far, we would like to use Opus to encode spatial audio. We hope to make it easy/possible to use libopus with other common tools and software modules (ffmpeg/libav in particular). Based on my reading of the