[Significant Improvement] QjackCtl

[canseco]

Third entry for Alive and Kicking Coding Competition.

- Updated Jack version to 0.121.3.
- Added audio tweaks to limits.conf and session-common to get Realtime working.
- Changed default settings to avoid xruns.
- Updated previews.
 

Now programs that need last jack stable version could be compiled, like Ardour.

 

[moxie]

Whee!!!

I've tried, and failed, to get something going with QJackCtl and some of the other tasty, tasty things you've ported. If you ever feel the need for a litte breather in your porting work, I'd love to see a PandoraLive posting about how to start up and use some of these things together

 (I'm mainly, I think, seeing things stopping because of xruns, so maybe the problem is solved by this *hopeful*)

 

[ekianjo]

I'd love to see a PandoraLive posting about how to start up and use some of these things together

I have already requested Canseco such article in the recent past and I really hope he does answer the request  

 

[canseco]

There are some plugins that need a better CPU  or optimized only for x86, but with new jack lib and realtime, there are no more xruns, pops or cracks.

I'm almost done with the article, but i still need to do some pics and refine a bit examples.

While you wait, take a look at this youtube channel.

http://www.youtube.com/user/LinuxMusic1

 

[drock]

Jack fails to start when I try to launch it.


08:14:28.169 Patchbay deactivated.
08:14:28.206 Statistics reset.
08:14:28.277 Could not open ALSA sequencer as a client. ALSA MIDI patchbay will be not available.
08:14:28.502 D-BUS: Service not available (org.jackaudio.service aka jackdbus).
08:14:28.528 JACK is starting...
08:14:28.532 jackd -P69 -t2000 -dalsa -dhwmap3pandora,1 -r44100 -p512 -n3 -s -S -C -i2
ALSA lib seq_hw.c:457snd_seq_hw_open) open /dev/snd/seq failed: No such file or directory
08:14:28.708 Could not start JACK. Sorry.
08:14:28.766 JACK was stopped with exit status=255.

any idea whats going on?

 

[canseco]

Change interface to hw:0 instead of hw:omap3pandora,1

PD: Forget to say, about error with snd-seq, check that Driver Midi is set to seq and check with lsmod on terminal, that snd-seq module is enabled.

 

[drock]

snd-seq is not enabled. changing to hw:0 gives the same error just listing hw:0 instead.

edit: Manually started snd-seq and snd-seq-midi and no longer get the midi error, but still get the other error and can't start jack.

 

[canseco]

Are you using last OS release, SZ 1.60?

This is my configuration on QjackCtl:

If it fails, try to put this on terminal:

jackd -P69 -t2000 -dalsa -dhw:0 -r44100 -p1024 -n2 -S -Xseq -D -Chw:0,1 -i2

And show me all entire log,

 

[ekianjo]

Canseco we are waiting for your article btw

 

[canseco]

I have a first version, could i send it with this contact form?

http://pandoralive.info/?page_id=2

 

[drock]

Hmm I cannot change the input or output device, they are greyed out.  jackd does not run from command line.  libjack is installed via opkg and I don't see any other jack related packages to install.  I am on 1.60.

 

[canseco]

Look at the screenshot, Audio option must be Duplex.

I suppose QjackCtl is updated and when your run jackd on commandline, it says version 0.121.3, because i don't see the logs.

 

[drock]

Sorry jackd just returns command not found. also tried as sudo. Got the settings identicle to yours now. screenshots attached. Do I need to install jack in some special way?

 

[canseco]

Last QjackCtl version contains jack 0.121.3, and should ask for password to install it on your NAND, SD.

Old releases installed jackd from repo (sudo opkg install jack-server).

Delete appdata/qjackctl folder and execute QjackCtl again.

 

[drock]

Awesome! Thank you that fixed it. Now time to play

 

[canseco]

Good to know it's solved,

The only problem is that with Duplex, you can get a lot of xruns (big delays)

Set Audio to Only Playback to solve this problem.

 

[drock]

yeah I noticed that.  Trying to play around and find settings to record with non-timeline, but have yet to find a combo that works.  Maybe a 1ghz or rebirth might have a better chance....