Linux-audio-user August 2016

linux-audio-user@lists.linuxaudio.org

57 participants
64 discussions

by Jeremiah Benham

I want to collaborate with someone in non-realtime. I see that there is a project called ardour session exchange. I read on the ardour forum that it has been included into ardour code now. I don't see where this is documented though. Does anyone know how to use it? Is this the best choice to collaborate with people on a recording project in a non-realtime way? Thanks, Jeremiah

8 years, 12 months

Re: [LAU] Crackles in audio - how to troubleshoot ?

by Kjetil Matheussen

> > "jonetsu(a)teksavvy.com": > Hello, > > Suddenly the audio started crackling. I was listening to a youtube > tutorial (firefox) and it started. Bitwig and Renoise were running but > not playing anything. I looked at the log files (syslog, kern) nothing > relevant. Card is 10101LT. > > Are you running demo versions of the u-he plugins in bitwig or renoise?

8 years, 12 months

Again: JACK using too much CPU after a while

by Ffanci Silvain

Hey hey everyone, I've looked more into this problem and found that JACK will start by using between one and two percent of the CPU, but will gradually require more. After a day JACK's CPU usage stands at about 65-85%. Usage: currently only mpv (multimedia player, completely shut down after every use). No persisting audio connections, no other realtime and CPU hungry applications. JACK Version: 0.121.3 Kernel Version: 3.9.0-rc6 SMP PREEMPT CPU scheduling/scaling_governor: powersave CPU setting: 800MHz single-core (of a 3GHz quadcore) Underlying soundcard device: ALSA multi with two MAudio Delta 1010 LT cards, sync'ed via S/PDIF. JACK commandline: jackd --timeout 4500 -R -d alsa -C cdelta -P pdelta -r 48000 -p 256 -z shaped short-time load average: 0.47 (decreasing for longer periods). If more information or experimentation, to identify the issue, is necessary, please let me know. Thank you for any help and hints in the right direction. Ta-ta, ---- Ffanci * Homepage: https://freeshell.de/~silvain * Twitter: http://twitter.com/ffanci_silvain * GitHub: https://github.com/fsilvain

8 years, 12 months

[Music] Sans titre - Without title

by jonetsu＠teksavvy.com

#Events #News https://soundcloud.com/nominal6/sanstitre

8 years, 12 months

Re: [LAU] Fwd: JACK and gstreamer

by Neil C Smith

On 23 August 2016 at 16:51, Mac <ussndmac(a)charter.net> wrote: > It appears neither gconf nor /system/gstreamer/0.10/audio/default/ are > resident in 16.04. (I'd guess the later path .../0.10/... would not be there > since 16.04 is using gstreamer 1 not 0.10, correct? AFAIK those settings are used by the gsettingsaudiosink in GStreamer, which is no longer in 1.x. It really depends on what software you're using, and whether it's hard-coding use of autoaudiosink. I questioned whether you'd actually been using the PulseAudio backend connecting to JACK though because there wasn't a way to specify which JACK ports to connect to until recently (eg. not in 14.04). The only other way to do it is to use something other than GStreamer itself to control which ports are used (eg. QJackCtl patchbay), which is what I'm still doing on my 14.04 setup. Best wishes, Neil -- Neil C Smith Artist : Technologist : Adviser http://neilcsmith.net Praxis LIVE - hybrid visual IDE for creative coding - www.praxislive.org Digital Prisoners - interactive spaces and projections - www.digitalprisoners.co.uk

9 years

ltcvideosplit - tiny tool to synchronize videos based on the LTC code in the audio stream

by Giso Grimm

Based on libav and the great LTC library of Robin Gareus, I wrote a small tool to simplify the synchronization of video files with audio: https://github.com/gisogrimm/ltcvideosplit If you connect an LTC signal (e.g., as generated by Ardour) with the audio input of any low-budget video camera, the video material of the camera can be aligned to the audio material played/recorded along with the LTC time-line (e.g., in Ardour). Essentially, this tool reports video- and LTC-frame number whenever they drift apart or the LTC signal starts. My use cases: - research: record videos for motion analysis which are time-aligned to sound events (with multiple cameras) - music videos: record videos to existing audio material with multiple cameras or multiple takes Maybe this tiny tool is useful for someone. Thanks to Robin for LTC tools and LTC support in Ardour! -- Giso

9 years

Fwd: Fwd: JACK and gstreamer

by Mac

---------- Forwarded message ---------- From: Mac <ussndmac(a)charter.net> Date: Tue, Aug 23, 2016 at 11:51 AM Subject: Re: [LAU] Fwd: JACK and gstreamer To: Neil C Smith <neil(a)neilcsmith.net> On Tue, Aug 23, 2016 at 11:04 AM, Neil C Smith <neil(a)neilcsmith.net> wrote: > On 23 August 2016 at 15:52, Mac <ussndmac(a)charter.net> wrote: > > I think, in the past (ubuntu pre-16.04) there were settings > musicaudiosink > > and audiosink that could specify which JACK sink was to be used by > > gstreamer. > > > > This changed the default behavior of gstreamer which was to connect to > the > > first 2 sinks in JACK. > > > > I think, this was the way it was in 0.1 gstreamer. > > > > I've been able to find nothing discussing this for gstreamer 1 or for > ubuntu > > 16.04. > > Are you sure that wasn't using JACK via PulseAudio? What are you > using GStreamer from? > > AFAIK, settings in GStreamer for defining the ports that the > JackAudioSink connects to are new - you can set the port-pattern > property. > > https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gs > t-plugins-good-plugins/html/gst-plugins-good-plugins-jackaudiosink.html > > Best wishes, > > Neil > > From the JACK audio web page ( www.jackaudio.org/faq/ gstreamer_via_jack.html ) : ____________________________________________________________ ___________________________________________________ 1. You need the GStreamer JACK audio plugin, which is currently (Fall 2009) part of the “bad” plugins collection. Most Linux distributions make this available through their normal software install/update systems. The name of the package containing this plugin will vary from distribution to distribution: on Fedora its called “gstreamer-plugins-bad-free-extra”, on Ubuntu its called “gst-plugins-bad”, etc. etc. 2. Next, you need to configure GStreamer to tell it to use this plugin for audio output. There are 3 methods available: - Through the command line using gconf2 (you may need to install this first) - Install/run gconf-editor, which is a general purpose utility for configuring many GNOME-centric applications. - Some systems may have the gstreamer-properties command available, which offers a graphical tool for configuring gstreamer. 3. Your goal is set the value of: - /system/gstreamer/0.10/audio/default/musicaudiosink - /system/gstreamer/0.10/audio/default/audiosink to this value: jackaudiosink buffer-time=2000000. The exact value of buffer-time doesn’t matter too much, but higher values reduce the chance of glitches/drop-outs in the audio stream. You might also choose to set /system/gstreamer/0.10/audio/default/chataudiosink to the same value, but its less likely to be useful to you. ____________________________________________________________ ___________________________________________________ It appears neither gconf nor /system/gstreamer/0.10/audio/default/ are resident in 16.04. (I'd guess the later path .../0.10/... would not be there since 16.04 is using gstreamer 1 not 0.10, correct? Mac

9 years

Fwd: JACK and gstreamer

by Mac

I think, in the past (ubuntu pre-16.04) there were settings musicaudiosink and audiosink that could specify which JACK sink was to be used by gstreamer. This changed the default behavior of gstreamer which was to connect to the first 2 sinks in JACK. I think, this was the way it was in 0.1 gstreamer. I've been able to find nothing discussing this for gstreamer 1 or for ubuntu 16.04. Can anyone enlighten me? Mac

9 years

Re: [LAU] Any success running Jack on a Chromebook that's running Crouton?

by Patrick Shirkey

> Hi all, > > I have a Acer C720 Chromebook, and I run Debian Stretch on it using a hybrid OS approach using a technology called Crouton ( > https://github.com/dnschneid/crouton ). > > It runs some kind of audio server proxy called Cras to get the audio from ChromeOS into Debian, and I have been unable to get Jack running with it. > > I'm wondering if anyone has any hints or success stories about running Jack and/or Ardour in a similar environment. > > I get a permission denied error (on /dev/sng/seq) when trying to start jack using qjackctl with ALSA midi seq enabled. If I disable MIDI support, I get "control open "hw:0" (No such file or directory)" and "ALSA lib pcm_hw:1701:( snd_pcm_hw_open) Invalid value for card" > > I would like to do some audio production on the chromebook, or at least get that stuff running to see if the performance for that would be acceptible. > > Let me know what other information I should provide to try to get this working. Hi Jeremy, The reason you are not able to run JACK is because CRAS is blocking the audio device. You will need to disable CRAS to get direct access to the audio device so that JACK can run. However This is not an easy thing to accomplish with ChromeOS. My recommendation is to also send this email to the Chrome developers mailing list. It's been a couple of years but in the past their response has been that Chrome OS is "Open Source" so anyone is welcome to submit a patch to CRAS that enables JACK support. My position is that seeing as they are paid to implement the audio server and seeing as they (Google) basically ripped off JACK and Pulse Audio in order to implement both CRAS (and Android Audio Server) and seeing as they also rely on ALSA (which was created by the Linux Audio community) that it is basic etiquette that they also implement full JACK support. However most likely their response will be that they are not interested in supporting JACK because it is not in their roadmap and they will not get internal support for adding to the roadmap. There are people at Google who really don't want to support JACK on Chrome/Android. They also seem to have a problem with professional audio in general. Of course if enough ChromeOS users wanted it they might be convinced to change their minds but so far it seems that ChromeOS users have not been asking for it because they don't appear to have made any progress on it. -- Patrick Shirkey Boost Hardware Ltd -- Patrick Shirkey Boost Hardware Ltd

9 years

Akai MPK mini mk2 config tool

by Daniel Swärd

Hi. A couple of days ago I bought an Akai MPK mini mk2. When trying to run the config editor tool through wine, the MPK mini doesn't show up in the list of available devices when picking what midi port to communicate with. It does however show other midi devices and midi through connections. Has anyone else had the same or a similar issue? I'm running Ubuntu 14.04 with the KXStudio addons. Cheers! /Daniel

9 years

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Linux-audio-user August 2016