Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

[Politis Archontis]

> That would be wonderful to have a HOA version of this. I had searched on
> your website for the tool to make it myself, but the page doesn't load
> http://mchapman.com/amb/soft/positions/
> 
> Regards,
> 
> Albert

Hi,

is that any different from opening up Reaper or any other DAW with some HOA 
plugins like the AmbiX ones, and encoding your mono test samples to any set of 
directions, and for the order that you need?

Regards,
Archontis
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Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

[Albert Leusink]

> > Stefan
> 
> Happy to have mine used (with usual academic courtesies ...).
> (It's on ambisonia, or I can send.
> Am working on a HOA version ...)
> 
> Michael
> 

> 




Hello Michael,

That would be wonderful to have a HOA version of this. I had searched on
your website for the tool to make it myself, but the page doesn't load
http://mchapman.com/amb/soft/positions/

Regards,

Albert




> > Stefan
> 
> Happy to have mine used (with usual academic courtesies ...).
> (It's on ambisonia, or I can send.
> Am working on a HOA version ...)
> 
> Michael
> 

> 




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Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

[Marc Lavallee]

On Tue, 10 May 2016 13:57:36 -0700
Eric Benjamin  wrote:

> When I recorded Haley Jo's lovely voice for the original eight
> directions, I also recorded her announcing other directions.
> Unfortunately I wasn't prescient enough to record every conceivable
> direction. I wonder what would be a good announcement for half height
> positions?

Suggestion:
I was thinking about speech synthesis of azimuth/elevation angles.

--
Marc


> On May 10, 2016, at 12:20 PM, Michael Chapman 
> wrote:
> 
> >> Aaron Heller wrote:
> >>   
> >>> Problem solved.  Here's the YouTube version of one of the most  
> > downloaded file from Ambisonia, AJH_eigtht_positions.amb  
> >>> 
> >>>  https://youtu.be/eY9DMn8pgGA  
> > 
> >   
> >> Well done.
> >> 
> >> Just one suggestion: As VR is a lot about 3D, you could think
> >> about to  
> > extend the "8 positions" demo to some equivalent 3D demo. Which
> > probably would be "26 positions". (3 rings w/ 8 positions each at
> > -45�, 0� and 45� elevation. 2 additional positions at +-90�, i.e.
> > zenith/nadir.)  
> >> 
> >> Stefan  
> > 
> > Happy to have mine used (with usual academic courtesies ...).
> > (It's on ambisonia, or I can send.
> > Am working on a HOA version ...)
> > 
> > Michael
> > 
> > 
> > 
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Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

[Eric Benjamin]

When I recorded Haley Jo's lovely voice for the original eight directions, I 
also recorded her announcing other directions. Unfortunately I wasn't prescient 
enough to record every conceivable direction. I wonder what would be a good 
announcement for half height positions?

Sent from my iPhone

On May 10, 2016, at 12:20 PM, Michael Chapman  wrote:

>> Aaron Heller wrote:
>> 
>>> Problem solved.  Here's the YouTube version of one of the most
> downloaded file from Ambisonia, AJH_eigtht_positions.amb
>>> 
>>>  https://youtu.be/eY9DMn8pgGA
> 
> 
>> Well done.
>> 
>> Just one suggestion: As VR is a lot about 3D, you could think about to
> extend the "8 positions" demo to some equivalent 3D demo. Which probably
> would be "26 positions". (3 rings w/ 8 positions each at -45�, 0�
> and 45� elevation. 2 additional positions at +-90�, i.e.
> zenith/nadir.)
>> 
>> Stefan
> 
> Happy to have mine used (with usual academic courtesies ...).
> (It's on ambisonia, or I can send.
> Am working on a HOA version ...)
> 
> Michael
> 
> 
> 
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Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

[Richard]

Don't forget the programs 'copysfx' and 'chxformat' in the CDP 
MultiChannel Toolkit enable users to tinker with channel masks, 
including setting to zero (if that helps), or of course to write a plain 
old multichannel WAVE file.


Richard Dobson
http://people.bath.ac.uk/masrwd/mctools.html





On 10/05/2016 20:30, Michael Chapman wrote:




Here's the problem  when writing a video file, FFMPEG appears to use
the channel_mask from the audio file even if a different channel_mask is
specified on the command line.   So even when I specified
"-channel_layout
4.0", the resulting MOV file still had the channel layout set to "quad",
which was then rejected by YouTube.



1)
You can (quite easily) use a hex editor (standard on most Linuxes) to edit
the *.wav.

Or even script this.

Seem to remember doing this about ten years, yawn, ago ...  (Could do some
digging!)

2)
TheSoX people were really nice.

A "sox -force_channel_mask 4.0" could be requested
though
a request "sox -force_channel_mask abcd" that would allow any mask would
be more 'democratic'.

Michael

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Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

[Marc Lavallee]

On Tue, 10 May 2016 19:21:37 - (GMT)
"Michael Chapman"  wrote:
> > Micheal Chapman did it in 2007:
> > http://ambisonia.com/Members/michael/ambisonicfile.2008-07-05.2994956247/
> >
> > A newer version could be done with a HOA panner and voice synthesis.
> >
> > --
> > Marc  
> 
> Ouch, just said 'working on it'.
> 
> OK : "reallyworking on it" !!!
> 
> Michael

I'm not working on it, but I though it could be nice to create a script
to automate the process for many languages and number of positions.

--
Marc
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Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

[Michael Chapman]

>> Aaron Heller wrote:
>> >   https://youtu.be/eY9DMn8pgGA
>
> On Mon, 09 May 2016 00:02:49 +0100, Stefan Schreiber wrote:
>> Well done.
>>
>> Just one suggestion: As VR is a lot about 3D, you could think about to
extend the "8 positions" demo to some equivalent 3D demo. Which
probably would be "26 positions". (3 rings w/ 8 positions each at
-45º, 0º and 45º elevation. 2 additional positions at +-90º, i.e.
zenith/nadir.)
>
> Micheal Chapman did it in 2007:
> http://ambisonia.com/Members/michael/ambisonicfile.2008-07-05.2994956247/
>
> A newer version could be done with a HOA panner and voice synthesis.
>
> --
> Marc

Ouch, just said 'working on it'.

OK : "reallyworking on it" !!!

Michael




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Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

[Michael Chapman]

> Aaron Heller wrote:
>
>>Problem solved.  Here's the YouTube version of one of the most
downloaded file from Ambisonia, AJH_eigtht_positions.amb
>>
>>   https://youtu.be/eY9DMn8pgGA


> Well done.
>
> Just one suggestion: As VR is a lot about 3D, you could think about to
extend the "8 positions" demo to some equivalent 3D demo. Which probably
would be "26 positions". (3 rings w/ 8 positions each at -45�, 0�
and 45� elevation. 2 additional positions at +-90�, i.e.
zenith/nadir.)
>
> Stefan

Happy to have mine used (with usual academic courtesies ...).
(It's on ambisonia, or I can send.
Am working on a HOA version ...)

Michael



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Re: [Sursound] ambix and its UUID

[Fons Adriaensen]

On Tue, May 10, 2016 at 02:32:19PM +0200, IOhannes m zmoelnig wrote:

> > Also in the paper it is at least suggested (Fig. 1) that the matrix
> > dimensions are 32-bit floating point, while the code uses 32-bit
> > integers (which makes sense).
> 
> while it might make sense, i'm pretty sure that the implementation does
> follow the suggestion in the paper and uses 32-bit floating point for
> the embedded matrix.

The matrix elements are of course float. But this is about the 
*dimensions*.

Ciao,

-- 
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)

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Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

[Marc Lavallee]

On Tue, 10 May 2016 16:11:11 +0200, David Pickett wrote:
> No criticism of the system -- it must be me, because LEFT BACK and 
> LEFT FRONT are indistinguishable.
> 
> Disappointing...
> 
> David 

Hi David.

It's you, but it's not "your fault" because everyone is different. Can
you compare the same file (AJH_eight-positions) using
http://ambisonic.xyz/? (Chrome required), or with the AmbiExplorer app?
The trick is to find the HRTF that fits you, which could be a tedious
task. So you could try the spherical model first, because it could be
similar to the one used by Youtube, then you could compare with others
from the CIPIC and LISTEN HRTF sets.

--
Marc

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Re: [Sursound] ambix and its UUID

[Marc Lavallée]

On Tue, 10 May 2016 12:03:46 +0200, IOhannes m zmoelnig wrote:
> hi,
> 
> [i just (re)subscribed to this list after i unsubscribed about 15
> years years ago...

Welcome back!

> surely i missed something (it's a pity that the list archives aren't
> searchable, btw)]

Here's an archive with search:
https://www.mail-archive.com/sursound@music.vt.edu/

--
Marc
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[Sursound] ambix and its UUID

[IOhannes m zmoelnig]

hi,

[i just (re)subscribed to this list after i unsubscribed about 15 years
years ago...surely i missed something (it's a pity that the list
archives aren't searchable, btw)]


i'm writing as the lead (and sole) developer of the libambix library [1]
that was designed as a reference implementation of the ambix fileformat
as described by nachbar et al. (2011).

it seems that people are starting to use both the ambix fileformat and
the libambix implementation, and this brings back an old issue of mine,
which i would like to discuss:


in their paper, nachbar et al. propose a UUID
"49454D2E-4154-2F41-4D42-49582F584D4C" as a chunk identifier in the CAF
file.

unfortunately this UUID has a serious drawback: namely, it is none.

at least, it is not a well behaved UUID, and as such it is not
guaranteed to be unique - which is the sole purpose of a UUID.

the CAF specs are very clear what is to be understand by a "UUID",
namely a "unique universal identifier as specified by ISO 14496-1".
the ISO 14496-1:2013 in turns refers to ISO/IEC 11578:1996 for the
specifications of the UUID.

the UUID specs know a few variants and give detailed instructions on how
to generate a UUID of a given variant in order to ensure that any UUID
is indeed "universally unique"; those specs were simply ignored when
coming up with the UUID for ambix.

therefore the libambix library proposes an alternative (well-behaved)
UUID, namely "1AD318C3-00E5-5576-BE2D-0DCA2460BC89"
(for those interested: this is a valid UUIDv5 (SHA-1 + namespace))

(libambix accepts the nachbar-UUID when reading ambix files, but
exclusively uses the UUIDv5 when writing files).



obviously this situtation has led to some confusion, as there now are
two UUIDs, one of them being documented in a published paper, and the
other being promoted by a reference implementation.

i would therefore like to persuade all parties interested in using ambix
to use a single (valid) UUID.
obviously my preference is to drop the nachbar-UUID and use
  "1AD318C3-00E5-5576-BE2D-0DCA2460BC89".


cheers,

fgmasdr
IOhannes


[1] https://git.iem.at/ambisonics/libambix

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