Linux-audio-user September 2013

linux-audio-user@lists.linuxaudio.org

99 participants
90 discussions

by Grekim Jennings

In theory there is no limit to the inter-sample peak level. It *could* matter for some technical test signals etc. For normal music signals even 0.5 dB should be enough, and even if it clips you very probably won't notice. Ciao, -- FA Interesting. Well, I would catch any overs anyway when doing the dithering. So, I compiled zresample without a hitch and it worked wonderfully. FYI, in this case the input and output files differed by about 0.01 dB. Thanks for the other suggestions (Hi Peter!).

12 years

sample rate converter?

by Grekim Jennings

On Fri, Sep 27, 2013 at 09:37:00AM -0400, Grekim Jennings wrote: >/ I need to convert 24-bit 48000 .wav to 44100 .wav. />/ What's your go-to converter for this? />/ Quality would be my first consideration, />/ 2nd would be ease of install or build, />/ 3rd would be I have a preference for command line. />/ This would be for off-line use. / I use zresample wich comes as an example app with the zita-resampler library. Apart from resampling it can also change the sample format, and add dither if the output is 16-bit. It handles any number of channels. >/ zresample --help / zresample 1.4.0 (C) 2007-2012 Fons Adriaensen <fons at linuxaudio.org <http://lists.linuxaudio.org/listinfo/linux-audio-user>> Usage: zresample <options> <input file> <output file>. Options: Display this text: --help Output file type: --caf, --wav, --amb Output sample rate: --rate <sample rate> Output sample format: --16bit, --24bit, --float Dither type (16 bit): --rec, --tri, --lips Add zero padding : --pad The default output file format is wav, 24-bit, no dithering. Integer output formats are clipped, float output is not. Ciao, -- FA Thanks Fons. Do you have a recommendation for how much headroom to leave before the conversion, and if you do clip during the conversion is there any sort of warning? I used to leave around 1.5 dB. The way I used to go about this was to apply all limiting to the 24-bit 48000 kHz track, then SR convert, then normalize (to ~ -0.3 dB) or set a final level, and finally dither/quantize.

12 years

sample rate converter?

by Grekim Jennings

Hi, I need to convert 24-bit 48000 .wav to 44100 .wav. What's your go-to converter for this? Quality would be my first consideration, 2nd would be ease of install or build, 3rd would be I have a preference for command line. This would be for off-line use. Thanks! Grekim

12 years

small pops during crossfade

by Rusty Perez

Hi folks, I'm performing some edits on an audio track. I have two versions of a track, side by side, and am cross fading between the tracks to produce one good version. But, I'm hearing what sounds like a small pop or click at the fade point. The crossfade is set to be about 0.02 seconds long because this is a rhythm guitar track. Anyway, would longer fades illiminate the sound I'm hearing? I'm wondering if this has to do with the digital domain, samples and stuff, which I don't fully understand. :-) It's quite subtle, and in the mix probably inaudible, but I would like not to have it. Thanks! Rusty

12 years

did anyone hear anything new regarding dante protocol support under linux?

by Ivica Ico Bukvic

I guess title says it all... I saw posts from last year that suggest Audiante had no interest in supporting Linux. Has anyone heard of any progress on this one? Ivica Ico Bukvic, D.M.A. Composition, Music Technology Director, DISIS Interactive Sound & Intermedia Studio Director, L2Ork Linux Laptop Orchestra Head, ICAT IMPACT Studio Virginia Tech Dept. of Music - 0240 Blacksburg, VA 24061 (540) 231-6139 (540) 231-5034 (fax) ico(a)vt.edu http://www.music.vt.edu/faculty/bukvic/

12 years

droning219 - droning232

by Louigi Verona

Slowly, but adamantly I continue to work on my "droning" project. 14 new tunes released, for your pleasure. Enjoy! http://www.louigiverona.ru/?page=projects&s=music&t=droning -- Louigi Verona http://www.louigiverona.ru/

12 years

FingerPlayServer in Ubuntu

by Hartmut Noack

Hello, FingerPlayMIDI is a very nice App for Android, that turns the touchscreen of a device into a MIDI-Controller with sliders, matrix and pads. http://code.google.com/p/fingerplaymidi I used it without any problem in Fedora 17 using its FingerPlayServer-component on the Linux-Box to connect the stream from the phone. It is a Java-Program, that is supposed to create a port like this: FingerPlayServer v0.8.0 Listening on 127.0.1.1:4444 Waiting for connection from phone.. Phone connected. Set MIDI Device: VirMIDI [hw:3,3,11] As said before, this worked perfectly OK in Fedora 17 but alas! In Ubuntu 13.04 with KXStudio Layer the server starts as expected but there is no port in Alsa-MIDI to be found. The server gets the signals OK and reports no errors. Does someone know, what could have changed in ALSA-MIDI and/or Jack-MIDI that this port from a Java-app is not accepted anymore? best regards HZN

12 years

jack firewire + built in audio

by Miguel Negrao

Hi Just wanted to check if there's an official approach to my situation: I have a macbook pro, sometimes I use the built in sound card (jack with alsa backend) and sometimes I use a MOTU soundcard (jack with firewire backend from ffado). I switch from one to other all the time, multiple times per day. I have several issues with that: - For each sound card I need to boot jack with different settings (basically just different backend ). - The names for the connections are different, for alsa they appear as 'system_0', etc. for firewire they are 'firewire_pcm'. - Going from one config to the other I need to stop jack and restart it with the new settings. In OSX to switch from one sound card to another, it's as simple as removing the firewire cable and sound will migrate to the internal sound card, plugging it back again migrates again to firewire ( I had firewire as default). I would like to mimick the OSX behaviour as close as possible. Currently I have a script at startime that checks for the existence of /dev/fw1 and boots with the right parameters [1] Also in supercollider I have to run this code [2] at startup to connect to right inputs/outputs. I was just wondering if there is a simpler solution to this, or if there is some plan to make it easier to switch soundcard with jack in the future ? Would there be any way to monitor firewire appearing and disappearing and running an appropriate script ? thanks, Miguel Negrão [1] The script is written in Haskell: #!/usr/bin/env runhaskell {-# LANGUAGE QuasiQuotes, OverloadedStrings #-} import Shelly import Shelly.Background import Prelude hiding (FilePath) import qualified Data.Text.Lazy as T import qualified Data.ByteString.Char8 as B import Control.Concurrent import Data.List (isInfixOf, sort) import Text.Shakespeare.Text (lt) import Filesystem.Path.CurrentOS hiding (fromText, (<.>)) import Text.ShellEscape import System.Environment runC x xs = catchany_sh (run x xs) (\_ -> return "x" ) main = shelly.verbosely $ do runC "killall" ["-9", "jackdbus" ] runC "killall" ["-9", "jackd"] runC "killall" ["-9", "qjackctl.real"] fwExists <- test_e "/dev/fw1" echo [lt|Firewire detected: #{show fwExists} |] if fwExists then do run "ffado-test" ["BusReset"] run "sleep" ["5"]; run "sh" ["-c", "qjackctl -s -p firewire" ] else do run "sleep" ["5"]; run "sh" ["-c", "qjackctl -s -p alsa" ] exit 0 [2] var jack_device = if("jack_lsp | grep firewire".systemCmd == 0){ "firewire_pcm" }{ "system" }; "SC_JACK_DEFAULT_INPUTS".setenv(jack_device); "SC_JACK_DEFAULT_OUTPUTS".setenv(jack_device);

12 years

Test please ignore

by Ivica Bukvic

12 years

pd-l2ork v.20130920 released

by Ivica Ico Bukvic

Apologies for x-posting... (given that this never made it through LAA, which may be just me being silly, here it is via the LAU list) It is my pleasure to announce the latest release of pd-l2ork free open-source visual programming language for interactive media, and supporting K12 educational module for the 32-bit and 64-bit Linux, as well as Raspberry Pi (Arm) platforms. pd-l2ork is the infrastructural backbone of Virginia Tech DISIS Linux Laptop Orchestra (http://l2ork.music.vt.edu). Highlights include: *Ported all vanilla GUI objects and events to cairo-based SVG-like tkpath canvas providing antialiased drawing capabilities, bezier patch cords, and setting stage for a zoomable canvas *Implemented a new scrollbar system using semi-transparent objects right on the canvas *Implemented filtering of autorepeat keyboard events for key, keyup, keyname objects *Expanded K12 library with numerous improvements and added a couple demo files *Backported resizable objects and recent files *Improved GUI appearance *Began porting 3rd party objects to new cairo-based canvas (non-accelerated 3rd-party objects can be recognized by having a blue selection box and their considerably slower redraw) *Cleaned-up extended pddp documentation and added comprehensive cyclone documentation *Began filtering (disabling) building of redundant externals within the cyclone and other 3rd-party libraries *Proper visual reordering without the potentially cpu-expensive canvas_redraw for all accelerated objects (non-accelerated 3rd-party objects can be recognized by having a blue selection box and their considerably slower redraw) *Disabled drawing of redundant nlets for objects embedded inside a GOP object (for Max users, equivalent to a bpatcher) *Embedded tkdnd and tkpath libs directly into source for a monolithic build; made several improvements to the tkpath lib fork *Many other minor bugfixes and improvements (see Changelog for more info) A screenshot of the K12 module is attached. Alternatively, it can be found at: http://puredata.info/downloads/Pd-L2Ork/releases/20130920/screenshot/image_v iew_fullscreen Complete Changelog: http://puredata.info/downloads/Pd-L2Ork/releases/20130920/ Download Links: Binary Builds & Documentation: http://l2ork.music.vt.edu/main/?page_id=56 Source: http:///github.com/pd-l2ork/ Best wishes, -- Ivica Ico Bukvic, D.M.A Composition, Music Technology Director, DISIS Interactive Sound & Intermedia Studio Director, L2Ork Linux Laptop Orchestra Head, ICAT IMPACT Studio Virginia Tech Department of Music Blacksburg, VA 24061-0240 (540) 231-6139 (540) 231-5034 (fax) disis.music.vt.edu l2ork.music.vt.edu ico.bukvic.net

12 years

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Linux-audio-user September 2013