Displaying 20 results from an estimated 3000 matches similar to: "5.1 surround channel coupling"
2007 Feb 26
3
Decoding for ambisonic Ogg audiob
The prospect of people actually putting B-format audio (via the panner
or directly input) into Ogg/Vorbis brings an interesting challenge:
What do we do with the audio after decoding it?
The following sane options exist:
A) Simply output the B-format audio
B) Produce a downmix
1) Mono.
2) Stereo blumlein crossed pairs
3) Stereo UHJ
4) binaural
C) Produce speaker feeds
1) Fully
2015 Nov 30
2
Proposal for Ambisonics format in vorbis comment.
"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
2007 Mar 22
3
Code for Ambisonics
Hi,
I have posted this three times to the flac-dev,
vorbis-dev, and ogg-dev mailing lists.
I wanted to see what code there was currently
to support Ambisonics. So I downloaded the
code from the xiph download page for
libogg-1.1.3, libvorbis-1.1.2, vorbis-tools-1.1.1
and flac-1.1.4, but wasn't able to find anything.
If it exists then I missed it, so could somebody
please point me to it.
2016 May 29
2
ambisonics formats and channel mappings
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
2007 Mar 22
1
Code for Ambisonics
On 3/22/07, Brian Willoughby <brianw@sounds.wa.com> wrote:
...
> But to return to your question, exactly what kind of "support" are
> you looking for?
I wasn't looking for any particular support, but
just to see what support was there (if any).
...
> I do not believe that there is any need for code specifically
> supporting Ambisonics. FLAC supports conversion to
2004 Sep 10
2
2/0, 2/2 3/0, 3/2, 5.1, wxyz
Josh Coalson wrote:
> --- smoerk <smoerk@gmx.de> wrote:
>
>>i didn't find anything about tagging flac files as surround files. i
>>think there should some possibility to tell the player how to play a
>>multi-channel file (how to map the different channels to the speakers
>>or if there some decode is needed, like for ambisonic files).
>
>
> it
2016 May 28
2
ambisonics formats and channel mappings
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
2008 Sep 07
7
Mapping = 1 Ambisonic Vorbis flag
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?
2016 May 31
1
ambisonics formats and channel mappings
On Tue, 31 May 2016 09:41:37 -0700
Michael Graczyk <mgraczyk at google.com> wrote:
> UHJ is an interesting way to preserve compatibility with non-ambisonic
> playback systems. However, I have not seen it generalized to higher
> orders. I expect that its popularity will decrease as HOA becomes more
> and more common. If UHJ becomes popular in the future, we could
> specify
2007 Jan 18
16
5.1 surround channel coupling
It obviously would be nice to have such a mode available, for e.g. DVD audio
compression. Apparently, the list doesn''t tell me too much about it. My
questions are:
1. What is the current status of the 5.1 channel coupling in Vorbis?
2. If I''ll be interested in participation in its development, what is the
recommended reading?
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2004 Sep 10
3
2/0, 2/2 3/0, 3/2, 5.1, wxyz
i didn't find anything about tagging flac files as surround files. i
think there should some possibility to tell the player how to play a
multi-channel file (how to map the different channels to the speakers or
if there some decode is needed, like for ambisonic files).
any idea how to implement it?
2000 Jul 07
2
True surround sound for Ogg -- a proposal
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.
2005 Nov 10
2
OggPCM proposal feedback
I threw a rough draft of an alternative format incorporating the
comments received so far in this discussion on the wiki:
http://wiki.xiph.org/index.php/OggPCM#Format
Oliver,
This seems to me like it would support the ambisonic requirements you
mention, though it doesn't (and I imagine won't) describe the mic
locations. Somebody who actually uses that info could probably define
extra
2000 Jul 11
0
True surround sound for Ogg -- a proposal (fwd)
Date: Mon, 10 Jul 2000 14:51:12 +0100 (BST)
From: DG Malham <dgm2@york.ac.uk>
To: vorbis-dev@xiph.org
Cc: DG Malham <dgm2@york.ac.uk>, Rob Fletcher <rpf1@york.ac.uk>
Subject: Re: [vorbis-dev] True surround sound for Ogg -- a proposal (fwd)
In-Reply-To: <Pine.SGI.3.95L.1000710092216.9043693B-100000@turpin.york.ac.uk>
Message-ID:
2009 Feb 09
3
Michael Graves post
Michael Grave just posted a question about surround conferences.
http://www.facebook.com/notes.php?id=564633430#/note.php?note_id=5009726
3908&id=564633430&index=0
I didn't see it posted on the ast-list, what do you think? Does
something like this have potential?
I'd love to listen in on one of these calls to see how it actually
sounds if someone builds a trial
2005 Nov 15
7
OggPCM2 : chunked vs interleaved data
I made a few updates to OggPCM2 http://wiki.xiph.org/index.php/OggPCM2
reflecting the latest discussions. Could everyone have a look at it and
see if they agree. Otherwise, what do you feel should be changed? Anyone
wants to speak in support of chunked PCM?
For all those that are just tired of this mess like me, please express
yourself in the new spec I created: OggPCM3
2018 Jul 30
2
Fwd: [PATCH] Support for Ambisonics
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
2016 Apr 18
5
Channel Mapping Family for Ambisonics
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
2016 May 16
2
Channel Mapping Family for Ambisonics
Tim,
Would you mind giving me a more specific example of the sort of document
that you think this should look like? I'd like to write up something that
is somewhat final.
On Mon, May 2, 2016 at 9:30 PM, Michael Graczyk <mgraczyk at google.com> wrote:
> On Fri, Apr 29, 2016 at 4:32 PM, Timothy B. Terriberry
> <tterribe at xiph.org> wrote:
> > As a general point,
2008 Sep 29
1
Ambisonics Proposal summary.
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