I get only 3 active tracks as well and the ogg file wont play in VLC
which has worked for me
streaming 1st order ogg files when i did a bunch of testing last year
- I could even stream thru
itunes with an extra tweak
I was actually interested in comparing some higher order bformat
playback if anyone knows of any files online
I can try out? A - B of 1st and 2nd order would be most useful
mick
On 13 Feb 2011, at 10:13, Jörn Nettingsmeier wrote:
On 02/13/2011 05:02 AM, Eric Benjamin wrote:
I was recently perusing the Ambisonics 2010 Symposium web site and
came across
the pages devoted to a streaming concert. The audio (4th order
Ambisonics) is
available as a downloadable Ogg Vorbis file:
http://ambisonics.iem.at/xchange/ambisonicssymposium_stream/
concert-ambisonics-recording-ogg/at_download/file
I downloaded the file and then spent most of the night trying to
play it. I
downloaded more than a dozen Ogg players and converters and almost
all of them
choked on the stream. I did find two ways to decode the file, one
of them being
the latest version of Audacity and the other being an add-in
filter file for
Cool Edit. Both of these agree that the file has nine channels,
but 6 of them
are empty. Not a satisfactory experience! Either the decoders
are broken or
the file is.
Have any of you been able to successfully decode this file?
i just ran it through oggdec, and i'm seeing the same: 9 channels, and
all but the first three are silence.
anyways, how can this file be "ambisonic"? it uses spherical
decomposition alright, but i doubt it could provide meaningful
information when played back over an inward-facing sphere of speakers.
iiuc, it's meant to be reproduced by either an outward-facing
higher-order point source such as an icosahedron, or via wfs (where
you
would take a subset of the signals and only look at the frontal
part of
the trombone sound, to be able to reproduce the frontal directivity of
the instrument).
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio), Elektrofachkraft
Audio and event engineer - Ambisonic surround recordings
http://stackingdwarves.net
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