Linux-audio-user October 2025

linux-audio-user@lists.linuxaudio.org

24 participants
9 discussions

by Bill Purvis

I've been having problems with connections between jack clients dropping out. I would like to have a program that monitors the state of connections. I've worked out how to locate the end client ports, but I don't want to have poll the connections at frequent intervals. Is there any way I can get a callback when either of the clients drops out? I suppose I could set up links between by monitor and the two client ports and activate those connections, but that seems like overkill. Is there an easier way. I'm actually using pipewire-jack but don't know enough about pipewire to do it directly. Bill -- +---------------------------------------------+ | Bill Purvis G8DIO | |bill(a)billp.org | +---------------------------------------------+

10 hours, 1 minute

Re: monitoring jack connections

by Kjetil Matheussen

Bill Purvis: > > poll the connections at frequent intervals. Is there any way I can get a > callback when either of the clients drops out? > The function jack_set_graph_order_callback does this. The callback is called whenever the graph of connections is changed. Then you can use other jack functions to find out if your client has dropped out. I don't know if writing a c program is an option for you, but there are probably higher-level languages that have support for jack. https://jackaudio.org/api/group__ClientCallbacks.html#gacd0804ccef7c6891d82… (Sorry if someone else has already replied this solution (I'm subscribing to the mailing list in digest mode), but I could not find any web archive of the linux audio mailing list working! Is there any left?)

2 days, 6 hours

Using Gigaport-ex with pipewire - only shows 2 channels

by Bill Purvis

Hi, I've just bought an ESI-Audio Gigaport-Ex to provide 8 output channels. When I connect up to my Laptop which is running Debain 12 with Pipewire, it appears on qpwgraph, but only shows two channels (Front-L + Front-R). How can I persuade it to show all 8? Thanks, Bill -- +---------------------------------------------+ | Bill Purvis G8DIO | |bill(a)billp.org | +---------------------------------------------+

5 days

Signal Chain Recommendations

by Stephen H. Dawson, DSL

Hi, I am undertaking a new recording project of my spoken voice. I am sorting through the many plugin options. I am writing to solicit signal chain recommendations, please I am happy with jackd and qtractor. Here are the plugins I have running on my computer. -DAW PLUGINS- autotalent calf-plugins ir.lv2 jamin lsp-plugins pulseaudio-equalizer pulseeffects rev-plugins swh-lv2 zita-at zita-rev1 Please be so kind as to share your recommended signal chain for this project. Kindest Regards, Stephen

5 days, 4 hours

VST3 now open source

by David W. Jones

VST 3.8.0 SDK Released - VST 3 SDK - Steinberg Forums <https://forums.steinberg.net/t/vst-3-8-0-sdk-released/1011988> --- David W. Jones gnome(a)hawaii.rr.com exploring the landscape of god http://dancingtreefrog.com Sent from my Android device with F/LOSS K-9 Mail.

5 days, 19 hours

mpv video frontend woes with i915 on Debian

by Peter P.

Hi list, excuse this question as being partially off-topic, as not sound is involved, but since some time (possibly since the last big Debian upgrade), mpv complains about the video backend only being available as "software renderer" and not being able to use "vo=gpu". I run this on a Lenovo X230 with an Intel card and the i915 kernel driver. I have learned that for older intel hardware (than my card?) users are recommended to use xserver-xorg-video-modesetting X11 driver instead of the the xserver-xorg-video-intel one. And indeed, I can switch back and forth between these two by (not) forcing the latter in Xorg.conf as Driver "intel" With the modesetting driver, mpv plays flawlessly using the vo=gpu output but Gem on PureData as well as glxgears stutter every few seconds. Having researched the web further, I found discussions about different performances of the two drivers. However, I would simply like to have mpv play nicely with the intel driver. Here is its output, that I can#t really make sense of despite having searched the web for a long time. Perhaps anyone on this list is able to help me further? Thanks a lot! Peter ------------> $ mpv --no-config test.mp4 2> /tmp/output.txt ● Video --vid=1 (h264 960x544 30.0001 fps) [default] ● Audio --aid=1 (aac 2ch 48000 Hz 192 kbps) [default] [vo/gpu/opengl] Suspected software renderer or indirect context. [vo/gpu/drm] VT_GETMODE failed: Inappropriate ioctl for device [vo/gpu/drm] Failed to set up VT switcher. Terminal switching will be unavailable. [vo/gpu/drm] Failed to acquire DRM master: Permission denied [vo/gpu/drm] Failed to commit ModeSetting atomic request: Permission denied [vo/gpu/opengl] Failed to set CRTC for connector 80: Permission denied [vo/gpu/drm] Failed to commit ModeSetting atomic request: Permission denied [vo/gpu/drm] Failed to restore previous mode [vo/gpu/drm] Failed to drop DRM master: Permission denied [vo/gpu-next/opengl] Suspected software renderer or indirect context. [vo/gpu-next/drm] Can't handle VT release - signal already used [vo/gpu-next/drm] Failed to set up VT switcher. Terminal switching will be unavailable. [vo/gpu-next/drm] Failed to acquire DRM master: Permission denied [vo/gpu-next/drm] Failed to commit ModeSetting atomic request: Permission denied [vo/gpu-next/opengl] Failed to set CRTC for connector 80: Permission denied [vo/gpu-next/drm] Failed to commit ModeSetting atomic request: Permission denied [vo/gpu-next/drm] Failed to restore previous mode [vo/gpu-next/drm] Failed to drop DRM master: Permission denied [vo/vdpau] VDPAU is most likely emulated via VA-API. [vo/vdpau] This is inefficient. Use --vo=gpu instead. [vo/vdpau] Warning: this compatibility VO is low quality and may have issues with OSD, scaling, screenshots and more. [vo/vdpau] vo=gpu is the preferred choice in any case and includes VDPAU support via hwdec=vdpau or vdpau-copy.

1 week, 4 days

MIDI routing in Ardour

by Fons Adriaensen

Hello all, I found no solution for this in the Ardour manual: - I import a MIDI file, using 'One track per channel'. - This results in 3 tracks being created, apparently corresponding to the two manual and one pedal parts of this organ work. - I want to send the MIDI data from these to Aeolus, each track using a different MIDI channel. Problem: all three tracks output on channel 1, and the per track channel selectors in the Edit window don't have any effect. What am I doing wrong ? TIA, -- FA

2 weeks, 4 days

sf2generate - a little SoundFont 2 (sf2) generator

by Hermann Meyer

Hi The last day's I'm working on a little tool which allow me to generate a SondFont 2 to be used with fluidsynth from a single audio file. It allow now to clip out a part of a file to be used as OneShoot instrument sample, select a part to be used as Looped Instrument. It detect the dominant Frequency and set the RootKey and PitchCorrection to be used in the generated SoundFont. Additional it allow to set the values for Chorus and Reverb. This allow to generate quickly a well tuned SoundFont from any sample you've laying around, or grep out a sample from a audio file to use it as Soundfont. Note, it will use only the first channel of a audio file, regardless how many channels it have. Supported audio file format is what ever libsndfile supports. Testers been welcome. https://github.com/brummer10/sf2generate regards hermann

2 weeks, 5 days

OT: Linux-compatible audio player?

by Josh Lawrence

Hello everyone, I need some recommendations for a portable hardware audio player (mp3, ogg, flac) that supports Linux, and is of reasonable quality. A quick search on Amazon pulls up everything from $18 - $200, and I'm afraid to pull the trigger without some kind of recommendation. My needs are simple, I just need to put tons of practice tracks on it and plug it up to my keyboard via some kind of audio jack (1/8"). Power on, select a track, play, experience musical disappointment, power off. :) General brand recommendations are useful, pretty much any info is more than welcome - my trusty mp3 player that was recommended by this list many years ago has vanished, so I must replace it. Thanks everyone! Josh

2 weeks, 6 days

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Linux-audio-user October 2025