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20662 discussions

OT: Dynamic range compression on classical recordings

by Jonathan Gazeley

This isn't strictly Linux-related but I hope someone here will have some helpful suggestions. I regularly make classical and choral recordings in my local church. I use a pair of omnidirectional small condenser microphones in an A-B layout and after much trial and error, I am very happy with the sound. However, I'm struggling a bit with dynamics processing on the recording. Naturally, choral music has an extremely wide dynamic range. If you normalise the infrequent loud parts to 0dB, the rest of the recording is too quiet, and people have complained that the CDs are "too quiet" compared to their other CDs. I know that people listen to these recordings on their iPod or in the car and if the quiet parts are too quiet, then they simply can't hear them. We all know about the loudness war and I certainly don't want to compress the crap out of these delicate and beautiful recordings. But I think some subtle compression would help bring up the average amplitude without clipping the loud parts. I've experimented a bit but I'm struggling to get a "natural" sound. After compression, it sounds fine in the quiet parts but in the louder parts it sounds "lumpy" and the reverb sounds unnatural. Does anyone here work with classical and choral recordings? I could use some advice on how to add compression with a light touch to make these recordings more practical for playback, without spoiling the natural ambience. Thanks, Jonathan

11 years, 1 month

Mix feedback on a new track?

by James Harkins

Hi all, I just did a rough mix on a track... well, I think a little better than a rough mix, but I can't go much further without some other ears having a listen. All audio synthesis is in SuperCollider running in Ubuntu; then I recorded stems on disk and loaded those up into Ardour (2) for easier control over the mix. A variety of influences at play here -- hope some of you enjoy it! Generally I'd put it under the electronica label, though it doesn't exactly fit. http://www.dewdrop-world.net/audio/wiggle-room4.mp3 I'm using CC-BY-NC-SA for this, as I usually do -- tagged as such in the MP3 comment field. Thanks! hjh Sent with AquaMail for Android http://www.aqua-mail.com

11 years, 1 month

Strange spurious byte in ogg page

by Ken Restivo

I'm playing around with the Ogg Vorbis wire formats, and am puzzled by something. The spec, and as far as I understand, the code of the implementations I've looked at, indicates that for the Ogg Page, there's a length of page_segments, then a segment_table, a sequence of bytes the length of that value. So if there's a 1 for page_segments, there should be one byte in the segment_table following, which contains the length of that single segment, etc. And then, the actual payload starts after that. But that's not what I'm seeing. Here's a peice of a valid file, encoded with the Xiph reference oggenc and plays perfectly everywhere I tried it: 00000000: 4f67 6753 0002 0000 0000 0000 0000 4cea OggS..........L. 00000010: 8175 0000 0000 6f9c 089f 011e 0176 6f72 .u....o......vor 00000020: 6269 7300 0000 0002 44ac 0000 0000 0000 bis.....D....... 00000030: 80b5 0100 0000 0000 b801 4f67 6753 0000 ..........OggS.. 00000040: 0000 0000 0000 0000 4cea 8175 0100 0000 ........L..u.... 00000050: 54f5 6fa8 113d ffff ffff ffff ffff ffff T.o..=.......... 00000060: ffff ffff ff07 0376 6f72 6269 732d 0000 .......vorbis-.. 00000070: 0058 6970 682e 4f72 6720 6c69 6256 6f72 .Xiph.Org libVor 00000080: 6269 7320 4920 3230 3130 3131 3031 2028 bis I 20101101 ( 00000090: 5363 6861 7566 656e 7567 6765 7429 0000 Schaufenugget).. 000000a0: 0000 0105 766f 7262 6973 2542 4356 0100 ....vorbis%BCV.. 000000b0: 4000 0024 7318 2a46 a573 1684 101a 4250 @..$s.*F.s....BP 000000c0: 19e3 1c42 ce6b ec19 424c 1182 1c32 4c5b ...B.k..BL...2L[ I see the 01 value at 0x1a, the page_segments, indicating there is one (1) segment. I see the 0x1e value at the next address 0x1b, the first segment in the segment_table indicating that there 30 bytes in the segment. All good. What's baffling me is, in that first page, the mysterious 01 value at 0x1c! What's that doing there? Can't find any documenation of it, and it causes the vorbis header to start one byte after the end of the segment values. And I see the value 0x76 the ASCII character 'v' to start the Vorbis packet at 0x1d, instead of at 0x1c where I'd expect it. There's also an additional trailing 01 at the end of the Vorbis packet, at 0x39, which confuses me as well. You'll see the next packet follows the same pattern: at 0x54 is page_segments, there's a nice 0x11 indicating 17 segments to follow, I see all the 0xff's there for the segment_table, followed by the 07 value for the length of the last segment, but then... there's that spurious weird extra byte, this time it is 0x03, at 0x66, before the payload (0x76, 'v') starts. Not any major big deal, but I'm OCD enough that wondering about stuff like this keeps me up at night. -ken

11 years, 1 month

Unable to create bootable USB of KXStudio

by Kazakore

Hi all. I know there are a fair few KXStudio users on this list and I've been meaning to try this distro for a while. So I have downloaded the 64bit version from their website and checked its integrity with the md5sum. All seems good and correct. However when I try and create a bootable USB to run/install it I can not boot from the USB key! The method I use is: sudo dd if="path-to-image" of="/dev/sdb" bs=1M This method has worked perfectly well for creating a bootable USB drive for other distributions using the exact same USB drive! Why wont this give me a bootable KXStudio USB drive? What do I need to do instead? Regards, Dale.

11 years, 1 month

dssi-vst doesn't see certain .dll files

by Renato

I'm trying to get some windows VSTs working with dssi-vst. Some work fine, but others won't show at all in dssi_list_plugins, and will give a "not found" error when I try to launch them with vsthost. Particularly I just downloaded the Kontakt free player, which I understood many had working with dssi-vst, and it falls in the non-listed class. I have the 3 .dll supplied in the same folder as other working .dll, but I get this with vsthost: $ vsthost Kontakt.dll -d 3 Returning file identifiers: RIm09HktUFdUmYGlh6aGz1ki DSSI_PATH not set, defaulting to /home/renato/.dssi:/usr/local/lib/dssi:/usr/lib/dssi:/usr/lib32/dssi RemoteVSTClient: executing /usr/lib32/dssi/dssi-vst/dssi-vst-server -g Kontakt.dll,RIm09HktUFdUmYGlh6aGz1ki DSSI VST plugin server v0.986 Copyright (c) 2004-2010 Chris Cannam Loading "Kontakt.dll"... dssi-vst-server[1]: not found in /usr/lib/vst/Kontakt.dll dssi-vst-server[1]: not found in /usr/lib/vst/Kontakt.dll dssi-vst-server[1]: not found in /usr/local/lib/vst/Kontakt.dll dssi-vst-server[1]: not found in /usr/local/lib/vst/Kontakt.dll dssi-vst-server[1]: not found in /home/renato/.vst/Kontakt.dll dssi-vst-server[1]: not found in .vst/Kontakt.dll dssi-vst-server[1]: not found in /windows/dlls/Kontakt.dll dssi-vst-server[1]: not found in /windows/dlls/Kontakt.dll dssi-vst-server[1]: not found in /home/renato/Audio/.vst/Kontakt.dll dssi-vst-server[1]: not found in Audio/.vst/Kontakt.dll dssi-vst-server[1]: not found in /windows/dlls/Kontakt.dll dssi-vst-server[1]: not found in /windows/dlls/Kontakt.dll dssi-vst-server[1]: not found in /home/renato/Audio/.vst/Kontakt.dll <----- this is the correct path, and the file is there dssi-vst-server[1]: not found in Audio/.vst/Kontakt.dll dssi-vst-server[1]: not found in DLL path dssi-vst-server: ERROR: Couldn't load VST DLL "Kontakt.dll" Plugin server timed out on startup: No such device or address vsthost: bailing out Am I missing something? cheers, renato

11 years, 1 month

ANN: competitive iPhD research assistantships available at Virginia Tech/ICAT/DISIS

by Ivica Ico Bukvic

Apologies for x-posting, I would greatly appreciate it if you would please disseminate the following among prospective graduate students. I am pleased to announce immediate availability of a competitive 12-month iPhD research assistantships in Human-Centered Design program for both the Spring 2015 and the Fall 2015. Virginia Tech's new individualized Human-Centered Design (HCD) iPhD transdisciplinary degree is closely aligned with the newfound Institute for Creativity, Arts, and Technology (ICAT). iPhD is a degree designed primarily to support individually tailored PhD experiences, allowing students to actively participate in shaping their plan of study. The GAship in question seeks candidates with a solid research background, and a strong sense of independence and self-sufficiency. We are particularly seeking students interested in sonification, sound spatialization, and interactive technologies (e.g. mind-body technologies, laptop/mobile ensembles, hyperinstruments, installations, mobile/wearable computing, etc.). Candidates must possess a strong knowledge of Max and Pd/Pd-L2Ork programming environments. C/C++ programming (or equivalent) is also preferred, as well as skills in other domains (e.g. interactive multimedia, K-12 education, 3D animation, etc.). This is a 12-month renewable assistantship with a full tuition waiver and one of the highest paying stipends at Virginia Tech. To be eligible candidates need to apply, be accepted, and enroll in the new HCD iPhD program with primary focus in the computer music domain focusing on one or more of the aforesaid areas of interest. The successful candidate will be given an opportunity to participate in conducting reserarch using the cutting edge 145 speaker system and consequently its innovative spatialization, sonification, and immersion approaches in the new $100M Moss Arts Center and more specifically Institute for Creativity, Arts, and Technology's three-story Cube space and its smaller counterpart, the immersive Perform Studio, as well as the new DISIS facilities that are coming online this fall. They will also work closely with ICAT faculty and students on a number of collaborative projects, including Tech or Treat, MAKEr camps, the upcoming SEAMUS conference, and other ICATinitiatives. For questions and application information please contact Dr. Ivica Ico Bukvic <ico(a)vt.edu> For more information: HCD http://www.vthcd.com/ ICAT http://www.icat.vt.edu DISIS http://disis.icat.vt.edu L2Ork http://l2ork.icat.vt.edu Best, -- Ivica Ico Bukvic, D.M.A. Associate Professor Computer Music ICAT Senior Fellow DISIS, L2Ork Virginia Tech School of Performing Arts – 0141 Blacksburg, VA 24061 (540) 231-6139 ico(a)vt.edu www.performingarts.vt.edu disis.music.vt.edu l2ork.music.vt.edu

11 years, 1 month

Sonic Visualiser v2.4.1 released

by Chris Cannam

Sonic Visualiser is an application for inspecting and analysing the contents of music audio files. It combines powerful waveform and spectral visualisation tools with automated feature extraction plugins and annotation capabilities. Version 2.4.1 of Sonic Visualiser is now available. This is a bugfix release, fixing one serious defect that caused crashes when rendering certain layers. http://www.sonicvisualiser.org/ For more information, please read the change log at: http://code.soundsoftware.ac.uk/projects/sonic-visualiser/repository/entry/… Sonic Visualiser uses Vamp plugins for automated audio feature analysis. For more information about Vamp plugins, including downloads and developer resources, see http://vamp-plugins.org/ Sonic Visualiser is Free Software under the GNU General Public Licence, developed at the Centre for Digital Music, Queen Mary University of London. Chris

11 years, 1 month

Linux Audio Conference 2015?

by Giso Grimm

Hi, does anyone know when and where the next linux audio conference will take place? Best, Giso

11 years, 1 month

Fireface UCX - turn on phantom power

by Hanns Holger Rutz

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 hi there, what is the best/easiest way (Debian Jessie) to switch on the phantom power of an RME Fireface UCX. I can use the thing out-of-the-box, however only the analog I/O works. This is fine, but now I need to toggle the phantom power. Is there a utility I can run that allows me to control that? Thanks, .h.h. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJUMmOrAAoJEKZFmaPaYk6Qc+EP/AnklcT1qr+2RisVQoq6Z8DB JtPyWuM21LyTzx4bfY5pWWenbwuPjkJkJ0hpjc1EpODRc2X4V9w2zsyUS/rb/7Fl 8oA2Ho0WI8Ia1/rTGXlM5eK5KXi35qQBx3dp0DbI8pIzLioqXRB9iaPx9sDBDEmi oBLk672v9NFOnmNvjIk07mdpPU7KE0NrrIrHcF+ZjLC6HLGdFG3iZ/4jdUou8cVf oVQsOMMmD2bBJb/xNxPgEnv15gm/T9vZZzTiFmPUChh1pY6Ry9ggLTEFpNvQvaqE noJ+QFQDuZvT0vb0T1GqOxanNKNo7wSYj7d7vgvOoCEW6ZNl/jbLWZe0jTvi/oni p+cffzIoXaGrrbjhD6TikeaMis5gwWmtM5ugMv54WRmyOFu67V1zIu78V2wrU/7k MO/rl/Nm4W87nSqslUm5TkazYmvClGqWpjMwSBdvCpZk43gP1XfsGX1SaNc3+MKq cd5MymDJLYFM3V4M7ppSil76XJvgxe7YHjbtTalBs7Aby1xlv8zH6r3vYQ/SSwFz TlUT/JgenvVS7V1+LfCuS7H5lKcTlG7TtGK7EjdMfhQ538k4rToZJHPlOucFIGG1 KTP9J1MlsHExLG04SodTLfFeHhJdt85BQR7oX7G0H5C8B4oBolaA67k8Wbf0v/ol nX+6mDNZQgKezBgr67QQ =V+GR -----END PGP SIGNATURE-----

11 years, 1 month

Re: [LAU] Lossy audio to lossless format

by Ralf Mardorf

On Sun, 2014-10-05 at 12:40 +0200, Ralf Mardorf wrote: > On Wed, 2014-10-01 at 09:14 -0400, Paul Davis wrote: > > > > > > On Wed, Oct 1, 2014 at 7:27 AM, Gene Heskett <gheskett(a)wdtv.com> > > wrote: > > > > Your ears are probably the best tool. Some hear well, and some > > do not. > > I am amazed at the number of people who cannot tell if mp3 has > > ever been > > in the mix. To me its obvious, when your ears get tired of it, > > and want to > > "change the station" in just a minute or so, its been an mp3 > > at some > > point. > > > > > > For crying out loud, stop this nonsense! > > > > > > It is established without any shadow of a doubt that the overwhelming > > majority of the population CANNOT tell the difference between a > > reasonable bit-rate encoding in mp3 format and the original PCM data. > > This isn't up for debate. > > For crying out loud, stop this nonsense Paul! > > Just because several people can't distinguish cheese made of raw milk > with cheese made from heated milk, doesn't mean that the tests are ok. > I'm unable to stand heated milk, I'm unable to stand cheese made from > heated mild and I'm unable to stand MP3. Yes, there are double-blind > tests that confirm that people guess the real taste of a strawberry is > the artificial taste and that the natural taste is artificial. IOW if > you make double-blind tests with degenerated idiots, the results will be > idiotic. > > Please post links about MP3 double-blind test done with human beings who > still remember how a real strawberry or banana yogurt does taste, who > know how a real Camembert made from raw milk does taste. > > What group of people was unable to distinguish between a good recording > and a MP3? PS: In Germany "cheese analogues" for "normal" foot are frowned upon by the same vegan people who pay much money for the same "cheese analogues", when the label isn't a frozen pizza, but vegan cheese :D.

11 years, 1 month

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Linux-audio-user