On Mon, Jan 30, 2012 at 08:41:28AM +0530, Rustom Mody wrote: I just recorded the first minute using the alsa-jack plugin, this works perfectly and their is no offset in the signal. So it's not the source or firefox or the plugin. Could it be that while recording from firefox you had the soundcard (auto)connected to the same track as well ? That would add the offset if the cause is your soundcard (which I suspect), even if the headset is not plugged in. Which is way too much, and indicates broken hardware. So please check your connections and then we'll see again. Ciao, -- FA Vor uns liegt ein weites Tal, die Sonne scheint - ein Glitzerstrahl.

On Mon, Jan 30, 2012 at 2:03 PM, Fons Adriaensen <fons(a)linuxaudio.org>wrote;wrote: So you are suggesting I "unconnect" the soundcard (and 'silently' record?) Ok how to unconnect the card? Not sure what you are asking here... What I can try is a friends machine... Let me try that (Some challenges to that I am the most 'pro' out here in the sense that I at least know how to spell j-a-c-k :-) -- I guess I'll just commandeer the machine.

On Mon, Jan 30, 2012 at 7:29 PM, Fons Adriaensen <fons(a)linuxaudio.org>wrote;wrote: Great -- that did it -- almost! Now one small problem: firefox appears as rawjack and audacity as portaudio in qjackctl but only when firefox is playing and audacity is recording. ie its not enough to start the apps to be able to rewire as you suggested -- they are not there. For audacity thats not an issue: I can start the recording and then cut off the first few seconds. But for firefox it means I lose the 1st few seconds played. So I guess I need to figure out how qjackctl chooses its default wirings and make my chosen ones the default?

On 01/30/2012 07:38 AM, Fons Adriaensen wrote: And the ports disappear when you hit Audacity's stop button. -- David gnome(a)hawaii.rr.com authenticity, honesty, community

On 01/31/2012 10:49 AM, thijs van severen wrote: I don't know about VLC, but Audacity is using portaudio and portaudio's JACK wrapper. We could petition for "proper" JACK support in Audacity, but that'd involve to directly add JACK to Audacity and bypass the portaudio abstraction or to work-around the issue in in portaudio's JACK hostapi. Likely, Audacity-devs are not prepared to do either :( Are any Audacity developers subscribed here to comment on the issue? Is anyone subscribed at http://audacity.sourceforge.net/contact/lists to forward this bug-report/feature-request? Has it been reported before? robin

On Tue, Jan 31, 2012 at 05:05:59PM +0400, Alexandre Prokoudine wrote: There are two separte issues. The first is using Jack via Portaudio + autoconnect which reduces it to 'a soundcard'. It creates problems when the record source is not a soundcard, quite a normal thing to do when using Jack. For example the OP of this thread wanted to record from Jack ports representing Firefox output, and the autoconnect added his soundcard leading to the DC offset problem. Having to fix this once when setting up a session may be accectable, but together with the point below it isn't. The second is the way Audicity manages its record signal chain. It exists (or is active) only when armed for record. This emulates the low-cost tape decks of 30 years ago (where it was done to share the electronics). But even the more advanced consumer ones at that time (those with a separate record head) had the record signal chain active all the time, and for anything 'pro' it is really essential. You really want to be able to set up a recording session, check levels, create a monitor mix, etc. once and while stopped, and not having to repeat this each time you arm for record. As to the abstraction you need I see two options. The first is very Jack-centric and probably not acceptable: create dedicated Jack ports for each track, bus, or whatever. It is what Ardour does. The other option can be used with a normal soundcard as well, and would even allow to continue using Jack via Portaudio. Keep the sound card 'open' all the time, providing silence on the outputs when there is nothing else to do. When using Jack, create a configurable size pool of input and output ports. In either case, within Audacity, allow any track, bus, module,... input or output to be assigned to any soundcard channel or Jack port. This still presents Jack as 'a soundcard', but it's much more flexible even when not using Jack. Ciao, -- FA Vor uns liegt ein weites Tal, die Sonne scheint - ein Glitzerstrahl.

On Tue, Jan 31, 2012 at 09:09:46PM -1000, david wrote: There are related issues with Ecasound. Configuring the audio engine and connecting the engine with external resources are separate steps. JACK ports are created in the second step. Once created, these ports are maintained regardless of transport state. For Nama, which uses Ecasound, I'm also hoping that session management will help. Nama retains state information, such as project name, that Ecasound does not. Is there any movement to make JACK session tools available to programs written in scripting languages? MMA, written in Python for example, could also benefit... -joel -- Joel Roth

On Thu, Feb 02, 2012 at 07:11:22AM -0700, Daniel Worth wrote: That's a helpful resource, thanks. Does qjackctl start applications as well? I don't see how Nama could to know to load a particular project, say "three_blind_mice". Perhaps qjackctl could execute a shell command like: screen -X -S audio screen -t Nama - three blind mice -p- -- nama three_blind_mice or rxvt -e nama three_blind_mice I'm especially interested non-GUI tools, since Nama caters to users who don't run X. Unfortunately the git repository for pyjacksm appears to be offline. :-( Regards, -- Joel Roth

Le 03/02/2012 00:48, Paul Davis a écrit : Hi Paul, 2 questions if you please : -are you talking about 0.3.8 ? -does it mean when have only Qjackctl started, go to the session panel and then one can launch Ardour and any supported app ?

On Thu, Feb 02, 2012 at 06:48:53PM -0500, Paul Davis wrote: I'm trying to figure out how to integrate Nama with JACK session. Can qjackctl start any application, any script on project load? Or does Nama have to be a registered jack client for this to work? (Nama doesn't touch JACK directly but it manages state for Ecasound). I've got the API docs, but I'm not sure how a Perl app could make use of the JACK session API. Thanks for any hints on this! Joel -- Joel Roth