Displaying 20 results from an estimated 400 matches similar to: "Opus 1.3-rc released"
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,
2019 Dec 18
2
opusenc for ambisonics?
Hi Andrew,
I suspect that the configure option should be enable-ambisonics (instead
of enable_ambisonics), but for each of opus, libopusenc, opusfile and
opus-tools git repos (on master branch), when I try "./configure
--enable-ambisonics", I get this error message:
configure: WARNING: unrecognized options: --enable-ambisonics
Thanks for your help.
Marc
Le 19-12-18 à 11 h 52, Andrew
2016 May 26
3
Channel Mapping Family for Ambisonics
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.
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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
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
2019 Dec 19
1
opusenc for ambisonics?
Unfortunately, ambisonics aren't exposed in opusenc yet, thus the trouble.
They're an API-only feature, but it's a good time to discuss what such a
command-line interface would look like, notably: how to specify multiple
streams & stream order, select the mapping family, coupled channels, and
how to specify the matrix (for family 3). Likewise, there's no multistream
support at
2016 May 06
5
[PATCH] Add Functions to Create Ambisonic Multistream Encoder
Here is the modified patch. I added a flag to configure.ac which is set to
0 to disable ambisonics, and 1 to enable it. Right now the implementation
simply creates a surround encoder with N uncoupled streams.
Thanks,
Michael Graczyk
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2016 Apr 25
2
Channel Mapping Family for Ambisonics
Hi Michael,
On 04/25/2016 05:32 AM, Michael Graczyk wrote:
> Channel Mapping Family 2
>
> Allowed numbers of channels: (1 + l)^2 for l = 1...15.
>
> Explicitly 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196,
> 225. Ambisonics from first to fifteenth order.
Would it make sense to allow an arbitrary number of channels and just
"truncate" the list of
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
2008 Oct 28
3
Vorbis, ambisonics and 'Vorbis Tools'
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
2016 Apr 19
2
Channel Mapping Family for Ambisonics
On 19/04/16 12:17 PM, Timothy B. Terriberry wrote:
> We should probably start keeping track of the space of invalid TOC
> sequences somewhere global so that people don't define conflicting
> extensions.
I started such a page at https://wiki.xiph.org/OpusExtensions
-r
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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.
2019 Dec 18
2
opusenc for ambisonics?
I compiled the latest (git master) of opus, libopusenc, opusfile and
opus-tools:
$ opusenc --version
opusenc opus-tools 0.2-8-g4976421 (using libopus 1.3.1-4-gad8fe90d)
I tried to encode a 3rd order Ambisonics wav file with the standard
Ambix (ACN-SN3D) format; opusinfo is reporting :
Streams: 16, Coupled: 0
Channel Mapping Family: 255 Map: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14,
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
2007 Feb 22
13
5.1 surround channel coupling
>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
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?
2018 Mar 19
3
[PATCH] Support for Ambisonics
Hello all,
Sorry for the delay (got really sick last week).
Attached are updated patches for libopus, libopusenc, opusfile and
opus-tools.
Note that the patches for libopusenc, opusfile and opus-tools are dependent
on the patch for libopus.
Please let me know if you have any additional followup comments or
questions.
Cheers,
Drew
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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
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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2016 Apr 26
2
Channel Mapping Family for Ambisonics
On Mon, Apr 25, 2016 at 9:32 AM, Timothy B. Terriberry
<tterribe at xiph.org> wrote:
> Jean-Marc Valin wrote:
>>
>> Would it make sense to allow an arbitrary number of channels and just
>> "truncate" the list of channels. For example, two-channel ambisonics
>> would be W plus X and three-channel would be W, X and Y. The idea is
>> that you would get