Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)
> 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 ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)
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 Thanks to Albert, Dillon, Bruce, and Marc for suggestions. Dillon diagnosed the problem, but it took a while to discover that the fix had to be applied farther upstream in my processing chain. TL:DR: use a plain old WAV_PCM file for the audio input to FFMPEG, not a WAVE-EX file. I am using the remix effect in SOX to convert from AMB format to ACN/SN3D -- "remix -m 1 3v0.7071 4v0.7071 2v0.7071". When sox writes out a 4-channel file it defaults to WAVE-FORMAT-EXTENSIBLE (which is correct according to the MS standards) with the channel mask set to "quad". I don't see anyway to change that to 4.0. 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. The workaround is to use the option "-t wavpcm" to force SOX produce a plain old WAVPCM file. (note that use of WAVPCM for more then 2 channels is undocumented). As a belt-and-suspenders measure, I added "-guess_layout_max 0" to the input in FFMPEG. I wrote a Python script that automates the whole process from AMB to MOV with spatial metadata. You can find it here: https://bitbucket.org/ambidecodertoolbox/amb2yt/src/master/amb2yt.py -- Aaron Heller (hel...@ai.sri.com) Menlo Park, CA US 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.) Stefan ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)
Currently, the surround (binaural) audio only works on Android devices. Cheers Bruce On Sun, 8 May 2016 09:29 David Pickett, <d...@fugato.com> wrote: > At 04:05 08-05-16, 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 > > > Exciting news -- thanks Aaron! > > But I must have missed something earlier. What do I do to play this > back in 4.0? Using Chrome, I have no problems with the BBC Proms, or > my own test page at http://www.fugato.com/pickett/surround-tests.shtml > > David > > > ___ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -- next part -- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20160508/608182b1/attachment.html> ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)
At 04:05 08-05-16, 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 Exciting news -- thanks Aaron! But I must have missed something earlier. What do I do to play this back in 4.0? Using Chrome, I have no problems with the BBC Proms, or my own test page at http://www.fugato.com/pickett/surround-tests.shtml David ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
