JackAudio July 2017

jackaudio@lists.linuxaudio.org

23 participants
11 discussions

[Jack-Devel] Cannot combine audio devices with more than 64 channels

by Jörg Müller

I need to combine two HDSPe MADI FX cards to one virtual device. I have a working driver, which is alsa-compatible. I can select each single card in any alsa-compatible application and all channels work flawless. For combining the MADI FX cards to one virtual device, I created an .asoundrc with 194 inputs for each card. When I start that virtual device via jackd -R -d alsa -C madifx_record_all -P madifx_playback_all I get this error: > creating alsa driver ... > madifx_playback_all|madifx_record_all|1024|2|48000|0|0|nomon|swmeter|-|32bit > jackd: pcm_multi.c:1060: snd_pcm_multi_open: Assertion `!slave_map[sidxs[i]][schannels[i]]' failed. However, it works when I reduce the amount from 194 to 64 channels per card. I tried to use 128 channels per card, but that fails the same way. See my alsa-info attached, which also includes the .asoundrc content. I also found this, which might be related: https://ccrma.stanford.edu/mirrors/lalists/lad/2005/06/0202.html To me, this looks like a bug. What do you think?

6 years, 9 months

[Jack-Devel] Zombified process without any CPU load

by Yuri

I am getting this error "Jack Error: zombified - calling shutdown handler" with default timeout of 500ms. Increasing timeout to 4000ms helps, but it isn't clear why 500ms isn't sufficient. Jack thread only connects with the actual client code through the process() callback. I timed process(), it never takes longer than 5ms. Given that the system has very low CPU load, why does the process become zombified? And why other apps, like Ardour, don't suffer from this? Client: newly written Jack backend for qTox. jack-0.125.0 on FreeBSD 11. Yuri

6 years, 9 months

[Jack-Devel] Why frame sizes are limited to the powers of 2?

by Yuri

jack_set_buffer_size limits frame size to the powers of 2. The Opus codec (http://opus-codec.org/) doesn't like such frame sizes. It defines frame sizes in milliseconds, and allows 5 ms, 10 ms, 20 ms, 25 ms, ... which in case of 48,000 sample rate are never a power of two. It seems like Jack shouldn't be so strict in limiting frame rates to the powers of 2. How to solve this problem? Yuri

6 years, 9 months

Re: [Jack-Devel] Jack won't start on boot

by Chris Caudle

On Thu, July 20, 2017 5:35 am, Yuri wrote: > The fact that any DBus-linked program requires X indicates some > problem. This should never happen. It did not require X, just that the DISPLAY environment variable be set. Explained later by Rowan. -- Chris Caudle

6 years, 9 months

[Jack-Devel] Jack won't start on boot

by alex

I'm trying to run a script in my Odroid-U3 which launches Jack and Pd, but Jack doesn't start. This is my script, called 'launch_jack_pd.sh': #!/bin/bash jackd -dalsa -dhw:1 -i2 -o4 -p512 -r48000 & pd -jack -inchannels 2 -outchannels 4 -nogui -open I've tried launching it with cron (user's odroid cron, not root), by appending the following line at the end: @reboot sleep 30 ; sh /home/odroid/scripts/launch_jack_pd.sh I've also tried launching it with rc.local, by placing the following line before 'exit 0': sudo -c '/home/odroid/scripts/launch_jack_pd.sh' - odroid & None of them seem to work. Pd runs, but Jack doesn't. The script is callable manually and works as expected. The Odroid runs lubunty 14.04.2 LTS, and Jack is jackdmp 1.9.10 Any tips?

6 years, 9 months

[Jack-Devel] Jack is broken on FreeBSD

by Yuri

The latest github version is broken, see details here: https://github.com/jackaudio/jack1/issues/67 Thanks, Yuri

6 years, 9 months

[Jack-Devel] The release site is broken

by Yuri

The recommended download site http://jackaudio.org/downloads/ suffers from these problems: * It is http:// making it vulnerable to MITM attacks. * It doesn't provide tarball fingerprints (md5 or sha256) I recommend you discontinue it, and just use GitHub instead. A lot of projects do this successfully. GitHub is already usable this way. Yuri

6 years, 9 months

[Jack-Devel] Considering JamRouter, a low-jitter MIDI bridge for all Jack versions

by Carlo Capocasa

Hello everyone, I have recently discovered JamRouter https://github.com/williamweston/jamrouter the use of which resulted in a subjective improvement in feel when playing percussive parts on high-throughput MIDI controllers such as the QuNeo or the Linnstrument over a2jmidid. The documented test cases in the readme seem rather impressive as well. It appears to me that JamRouter is highly undervalued and I would like to ask for your opinions as a Jack users on whether it has simply been overlooked, or whether there is a technical reason it is not receiving more attention. Thank you very much! Carlo -- View this message in context: http://jack-audio.10948.n7.nabble.com/Considering-JamRouter-a-low-jitter-MI… Sent from the Jackit mailing list archive at Nabble.com.

6 years, 9 months

[Jack-Devel] Status of the jackaudio.org homepage and releases (good news)

by Markus Seeber

Hello again, as elaborated in my previous mail (bad news) the jackaudio.org page is kind of in trouble. Before these problems can be resolved, there are a few things that have to be made clear: 1 Who has currently access to the webspace hosting jackaudio.org? I know Paul has, I think Stéphane has and somewhere in the back of my head a voice tells me the Filipe might have access? 2 What I know is, that whoever has access to the webspace of jackaudio.org has not been monitoring the jack-devel list for my pull requests. I asked Paul directly and it was done, but I think that should not be required all the time, so here are some proposals: 2.1 Allow me to access the webspace and do the updates myself. I do not need a real shell, some kind of file system access should be sufficient. Pro: * technically easy, depending on how it's done * simplifies communication for me (no need to send pull requests to the List) * will result in fast updates in the future * adds no more dependecy on GitHub services Con: * trust/security/legal concerns * shifts more responsibility on me, reduces control for the webspace owner * still fails in case I am not available 2.2 Set up continuous integration process GitHub offers an API for interacting with external services in case a repository is updated. This could be used to deploy changes in the jackaudio.org repository automatically to the webspace. I would need to look up how this could work in detail and if there are additional costs involved. Maybe it can be done in the same way as the ardour.org homepage is set up? Pro: * removes more need for manual intervention in the long run * no need to authorize additional users to access the webspace * keeps working even if the maintainers of the website changes Con: * requires an external or internal service to be authorized to access the webspace * requires some amount of initial setup and testing * adds a dependecy on GitHub services * needs documentation and maintenance cost might be to high 2.3 Remove the webspace from the chain completely. The page will then be hosted only on GitHub pages under the jackaudio.org domain. Pro: * simplifies deployment considerably * Deployment does not depend on multiple people anymore: faster, less work hours wasted * Deployment of updates will be much faster * more features of the GitHub Pages service can be used, like fetching repository metadata, hosting of binaries, etc... * Adding/removing maintainers is easy and handled through access to the GitHub repository Con: * Makes the page dependant on GitHub, if GitHub goes down or evil, so will the page. Still, it will be possible to host the static page on any webspace when that happens and just change the domain record. * Domain owner has less control over the page content. * Needs some setup by the domain owner, I remember there have been concerns about the records for mail adresses and the jack mailing lists. (not entirely sure since the lists seem to sit on a subdomain, this probably also entails security concerns...) 2.4 Migrate to something completely unrelated. aka Your suggestions? 3 hosting of binaries This needs input by those who manage the releases of jack1 and jack2 since it is tied into the release process. What users usually expect is the following ordered by importance (subjective): a) one official location for downloads b) a predictable and consistent naming convention for files and archives and the contents (especially for packaging) c) predictable and consistent URLs for all versions and variants(especially for packaging) d) complete source tarballs e) patchnotes f) additional mirrors g) checksums h) release announcement b, d, e, g, and h are usually provided by the ones responsible for the releases, the rest depends on which approach was chosen in section 2. If the webspace is used, I strongly suggest to use it also for the binries and in case I get access I can offer to put the binaries there for you in the right place. Otherwise there is the opportunity to create tags on your GitHub repositories and attach the files there, which is also a nice place to put checksums, patchnotes and other version information and also provides automatically a source archive of the tagged commit. I will not add the binaries into the repository of the webpage and git LFS does not sound especially compelling to me too since it requires, surprise, external hosting of the files anyway and in that case, there is almost no gain over just using the webspace or the GitHub releases features. Dear Paul, dear Stéphane, dear Filipe, maybe talk to each other on the LAC about it and come to a conclusion, because I am at a loss here and can not go any further without your intervention. It's not the end of the world, but it kind of keeps bugging me and the users. best regards Markus

6 years, 9 months

[Jack-Devel] Jack to Bluetooth

by jamie marchant

Hi: I'm new to Jack. Can it be used to redirect audio output over Bluetooth? Could you use it as a headset with a PS3 in that case? -- -Jamie Marchant

6 years, 9 months

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JackAudio July 2017