[Sursound] Interactive Audio Systems Symposium, University of York, 23rd Sept
Hello all, Apologies for any cross-posting. Please see below a call for contributions for a free event on Interactive Audio Systems to be held at the University of York on 23rd September. Hope to see you there. Many thanks, Gavin Call for Contributions Interactive Audio Systems Symposium, University of York York, UK Friday 23rd September, 2016 Recent advances in low-cost motion-tracking and sensing technologies, coupled with increased computing power have paved the way for new methods of audio production and reproduction. Interactive audio systems can now readily utilise non-tactile data such as listener location, orientation, gestural control and even biometric feedback, such as heart rate, to intelligently adjust sound output. Such systems offer new creative possibilities for a diverse range of applications ranging from virtual reality, mobile technologies, in-car audio, gaming, social media and film and TV production. The University of York is pleased to announce a one-day symposium dedicated to this topic of interactive audio systems. The symposium will explore the perceptual, signal processing and creative challenges and opportunities arising from such audio systems affected through enhanced human-computer interaction. The symposium will consist of original paper and poster sessions as well as invited presentations from key industry figures and demonstrations of emerging interactive audio technologies. We are now accepting proposals (Abstract and Precis) for 4-8 page papers or posters on novel research in related fields to interactive audio including, but not limited to, the following areas: - Moving sounds and moving listeners - Audio for Virtual Reality - Spatial audio techniques - Psychoacoustics and perception - Signal processing for interactive audio - Robust listener control - Motion tracking - Game audio - Real-time audio synthesis - Interactive music generation - Workflows for interactive audio - Sound design for interactive audio We also invite proposals for tutorials, workshops and demos to be presented on the day. Prospective participants can download the call for contributions here: http://www.york.ac.uk/sadie-project/IASS2016/IASS_Call_for_Contributions_2016.pdf Important dates: July 1st 2016 - Paper/Poster Abstract Submission deadline July 15th 2016 - Notification of acceptance July 31st 2016 - Workshop/Demos submission deadline August 26th 2016 - Camera-ready paper submission September 23rd 2016 - Symposium Please visit the symposium webpage for further details at http://www.sadie-project.co.uk/IASS2016.html Organising Committee: Symposium Chair: Gavin Kearney Email: iass-ch...@sadie-project.co.uk Papers Chairs: Gavin Kearney and Hyunkook Lee Email: iass-papers-ch...@sadie-project.co.uk Workshops Chairs: Sam Hughes and Mariana Lopez Email: iass-workshops-ch...@sadie-project.co.uk Program Committee: Jude Brereton, University of York Helena Daffern, University of York Marcin Gorzel, Google Inc. Sam Hughes, University of York Gavin Kearney, University of York Hyunkook Lee, University of Huddersfield Mariana Lopez, Anglia Ruskin University Damian Murphy, University of York Chris Pike, BBC R&D -- Dr. Gavin Kearney Lecturer in Audio and Music Technology Department of Electronics University of York Heslington York YO10 5DD Tel: +44 (0) 1904 32 2374 Fax: +44 (0) 1904 32 2335 Web: http://www.elec.york.ac.uk/ SADIE Project: http://www.sadie-project.co.uk/ EMAIL DISCLAIMER http://www.york.ac.uk/docs/disclaimer/email.htm ___ 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..)
Is there some trick to uploading these files? The files I make upload, but then fail during processing. I make the files like this: $ /opt/local/bin/ffmpeg -loop 1 -framerate 30 -i cube-1920x960.png -i > AJH_eight-positions-ambix.wav -map 0:v -map 1:a -c:a pcm_s16le > -channel_layout quad -c:v libx264 -preset medium -tune stillimage > -shortest -pix_fmt yuv420p output-png-30fps-pcm_s16le-quad.mov then use Dillon's "Spatial Media Metadata Injector" (SMMI for short) like this: $ python spatialmedia --inject --spatial-audio > output-png-30fps-pcm_s16le-quad.mov > output-png-30fps-pcm_s16le-quad-inject-spatial-audio.mov > Processing: output-png-30fps-pcm_s16le-quad.mov > Saved file settings > Track 0 > Spherical = true > Stitched = true > StitchingSoftware = Spherical Metadata Tool > ProjectionType = equirectangular > Track 1 > Ambisonic Type: periphonic > Ambisonic Order: 1 > Ambisonic Channel Ordering: ACN > Ambisonic Normalization: SN3D > Number of Channels: 4 > Channel Map: [0, 1, 2, 3] and then use Google Chrome to upload output-png-30fps-pcm_s16le-quad-inject-spatial-audio.mov to my account on YouTube and the file uploads, but then YouTube reports " Upload failed: Can't process file" If I don't specify --spatial-audio on the SMMI, the resulting file uploads and processes just fine. The spherical video works, but no spatial audio. You can find it here: https://youtu.be/dyf_BXpqeMg I also tried different audio codecs '-c:a libfdk_aac -b:a 512k' and '-c:a libvorbis -b:a 512k' and different containers 'mp4' and 'mkv' -- no joy. Any ideas anyone??? (Am I on double-secret probation? Do I need upload insurance?) Aaron (hel...@ai.sri.com) Menlo Park, CA US On Fri, Apr 22, 2016 at 12:06 PM, Bruce Wiggins wrote: > > We've been running a few tests and I'll be putting more details up on my > website when we're happy with the results. > > 360 Ambisonic VR Tests: > http://www.youtube.com/playlist?list=PL6JlYpSUt3kgtQJou2AfgAVtWA5a6SMO1 > > The use of wav over aac, by the way, is more to do with ffmpeg messing with > the channel order, which is a pain. Much easier to use pcm. > > Cheers > > Bruce > > On Fri, 22 Apr 2016 17:07 Marc Lavallee, wrote: > > > On Fri, 22 Apr 2016 17:42:34 +0200 > > Bo-Erik Sandholm wrote: > > > > > Hi > > > I suspect it could be possible to create a 360 video containing one > > > cicular/ball panorama with FOA sound and play that via youtube? > > > > But only using their Youtube Android app... Those using a > > non-google-appified Cyagenmod as their Android OS cannot use the > > Youtube app, because all the google-apps must be installed first. > > Google is breaking EU antitrust rules: > > http://europa.eu/rapid/press-release_MEMO-16-1484_en.htm > > > > > Is this possible? if so, which tools to use to create a video to > > > upload. > > > > Check: > > https://support.google.com/youtube/answer/6395969?hl=en&ref_topic=2888648 > > Then: > > https://trac.ffmpeg.org/wiki/Encode/YouTube > > > > The video must be in equirectangular 2:1 format. > > > > > I have foa recordings of my own and panoramas from the recording. > > > Bo-Erik > > > > I hope to soon provide a browser based alternative to the Youtube app. > > -- > > Marc -- next part -- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20160425/be8c7b3d/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..)
Aaron Heller writes: > > Is there some trick to uploading these files? The files I make upload, but > then fail during processing. > Hi Aaron, Try this, start with an MP4 video file and the 4-channel .wav ACN audio file. Maybe the issue is that you are trying to loop a still image? Also, I did not specify quad layout, I just attached the 4-ch .wav. -i YT_Videofile.mp4 -i YT_ACN_audiofile.wav -map 0:0 -map 1:0 -c:a copy -async 1 -c:v copy -aspect 1920:960 -pix_fmt yuv420p -threads 8 -metadata creation_time=now -sn -y YoutubeFinal.mov It takes about 4 hours for the spatial audio (with the rotation) to fully process after you upload it (sometimes longer), but you should be able to hear the ACN rendered to stereo pretty soon after you upload. Hope that helps, Albert ___ 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..)
I've documented the workflow and commands that worked for me here: http://www.brucewiggins.co.uk/?p=666 cheers Bruce On Mon, Apr 25, 2016 at 10:15 PM Albert Leusink wrote: > Aaron Heller writes: > > > > > Is there some trick to uploading these files? The files I make upload, > but > > then fail during processing. > > > > > Hi Aaron, > > Try this, start with an MP4 video file and the 4-channel .wav ACN audio > file. Maybe the issue is that you are trying to loop a still image? Also, I > did not specify quad layout, I just attached the 4-ch .wav. > > > -i YT_Videofile.mp4 -i YT_ACN_audiofile.wav -map 0:0 -map 1:0 -c:a copy > -async 1 -c:v copy -aspect 1920:960 -pix_fmt yuv420p -threads 8 -metadata > creation_time=now -sn -y YoutubeFinal.mov > > It takes about 4 hours for the spatial audio (with the rotation) to fully > process after you upload it (sometimes longer), but you should be able to > hear the ACN rendered to stereo pretty soon after you upload. > > Hope that helps, > > Albert > > ___ > 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/20160425/57813276/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.
[Sursound] Envelopment
The last paragraph is the meat, if this is too long. I have belatedly gotten around to reading the AES paper by Sunish George, Francis Rumsey et al entitled "Development and Validation of an Unintrusive Model for Predicting the Sensation of Envelopment Arising from Surround Sound Recordings" Dec 2010. This paper defines what envelopment sounds like quite well, But to paraphrase the US Supreme Court on pornography, I know envelopment when I hear it. For me it is a sense of "You Are There" concert hall realism. For some time now, I have been using Ambiophonics and the RACE program to generate a sense of envelopment by using two speakers behind the listening position at an angle of about 20 degrees and only two meters or so away from the main listening family size area.. This rear speaker pair is fed a duplicate of the front pair and is just crosstalk cancelled using somewhat different parameters than used for the front 2.0 pair. Neither the level nor the delay of the rear pair is critical within reason which is a rather remarkable result. I have had hundreds of listeners here and elsewhere in the world confirm the effect. I call it Envelophonics and there is a tutorial on the details on the Ambiophonics website. I wish I had the resources to get a 50 man listening panel and produce an AES paper but perhaps NYU will produce a thesis on Envelophonics like the one Roginska et al did on frontal Ambiophonics. (Link on the Ambiophonics.org home page) Basically when you turn on the rear crosstalk cancelled speakers, you have an enhanced spatial sense of being there at the recording site. The stage gets wider and it is easier to localize instruments and sense depth. The home listening area also gets larger and, if way off the center line or walking about the room, you still get a feeling of space and can hear both channels clearly. In brief what most auditors hear and describe matches what the referenced paper and other earlier sources describe as envelopment. There is no sense of ASW (Apparent Spource Width) changing so that factor is not an issue. Now if you turn off RACE, so you just have a rear stereo pair behind you, this envelopment effect collapses entirely. I had originally used the rear speakers for surround sound purposes so as to achieve a full circle of direct sound in the horizontal plane from just ordinary 4.0 media. They were also used to correct a 2.0 pinna localization cue distortion.. So I was pleased that the rear speakers were additionally valuable when auditioning 2.0 media. Note that head tracking has never been required for Ambiophonics and is similarly not needed when Envelophonics is added. You can move your head all you wish, lean, nod, stand, move forward or back, rotate the head, etc. with little affect. Why is crosstalk cancellation fort the rear pair essential to producing this kind of envelopment? Subject to a PHD project someday by someone, I believe the effect is easy to explain. In normal hearing the pattern of very very early reflections from the half circle of seats or heads behind you changes in directional cues with the location of a sound source in front of you. But if you are listening to a 60 degree stereo loudspeaker triangle in a listening room, all the reflections from nearby rear surfaces have essentially the same level and time differences at the ears no matter where the virtual image in front is. The brain senses this as a flat earth effect. If you then provide a rear reflection pattern that does change normally with the frontal direct sound source location, you get early reflections that come from all over including the sides which are known to stimulate envelopment. This rich early reflection collection now also swamps the later lower level room reflections so their static nature is less significant and even desirable. Again, if you just have ordinary stereo at the rear it does not work and worse, you might then have front to rear reversals. With RACE on at the rear, the level can be quite high before anything behind you becomes audible. List members are welcome to visit to hear the effect for themselves or just use one of the RACE apps or components and DIY. Ralph Glasgal, glas...@ambiophonics.org -- next part -- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20160425/69f0c832/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.
