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 _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
