Hi Thank you so much for your quick response.I'm doing this for a side project, I need to capture the audio from speak and do some other tasks on the audio file once it's saved on disk. I'll look into jack_capture Thank you  ----- Original Message ----- From: Kjetil Matheussen <k.s.matheussen(a)gmail.com> To: garden_9652(a)yahoo.co.jp Cc: "jack-devel(a)lists.jackaudio.org" <jack-devel(a)lists.jackaudio.org> Date: 2019/5/14, Tue 17:39 Subject: Re: [Jack-Devel] How to capture audio from speaker? On Tue, May 14, 2019 at 10:33 AM <garden_9652(a)yahoo.co.jp> wrote: Hi, I don't know whether you are doing this for fun/learning experience, or you are looking for a program that does this. But if the latter is true, this is the main purpose of the program jack_capture: http://archive.notam02.no/arkiv/src/jack_capture-0.9.73.tar.gz

Hi I have install jack_capture and how can I run it? $ jack_capture./jack_captureCannot connect to server socket err = No such file or directoryCannot connect to server request channeljack server is not running or cannot be startedJackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlockJackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock>>> jack_client_open() failed, status = 0x11 So I start jackd : $ jackd -d coreaudio then start jack_capture $ jack_capture then it starts to record, but the audio file I got jack_capture_01.wav is just blank Anything wrong?  Thanks ----- Original Message ----- From: Kjetil Matheussen <k.s.matheussen(a)gmail.com> To: garden_9652(a)yahoo.co.jp Cc: "k.s.matheussen(a)notam02.no" <k.s.matheussen(a)notam02.no>no>; "jack-devel(a)lists.jackaudio.org" <jack-devel(a)lists.jackaudio.org> Date: 2019/5/14, Tue 17:51 Subject: Re: [Jack-Devel] How to capture audio from speaker? On Tue, May 14, 2019 at 10:49 AM <garden_9652(a)yahoo.co.jp> wrote: Yes, that's what jack_capture was made for. Just run it without any arguments, and it will record a stereo file, floating point wav, to disk. github page: https://github.com/kmatheussen/jack_capture

Hi What do you mean `jack playing something?` I just played some youtube video on Chrome. What else should I do? Thanks ----- Original Message ----- From: Kjetil Matheussen <k.s.matheussen(a)gmail.com> To: garden_9652(a)yahoo.co.jp Cc: "k.s.matheussen(a)notam02.no" <k.s.matheussen(a)notam02.no>no>; "jack-devel(a)lists.jackaudio.org" <jack-devel(a)lists.jackaudio.org> Date: 2019/5/14, Tue 18:03 Subject: Re: [Jack-Devel] How to capture audio from speaker? On Tue, May 14, 2019 at 11:01 AM <garden_9652(a)yahoo.co.jp> wrote: Is jack playing anything? (jack_capture only records audio played by jack)

Hi It does not have to be Chrome, in order to use jack_capture How can play something use jack? ----- Original Message ----- From: Kjetil Matheussen <k.s.matheussen(a)gmail.com> To: garden_9652(a)yahoo.co.jp Cc: "k.s.matheussen(a)notam02.no" <k.s.matheussen(a)notam02.no>no>; "jack-devel(a)lists.jackaudio.org" <jack-devel(a)lists.jackaudio.org> Date: 2019/5/14, Tue 18:10 Subject: Re: [Jack-Devel] How to capture audio from speaker? On Tue, May 14, 2019 at 11:08 AM <garden_9652(a)yahoo.co.jp> wrote: You need to hook up Chrome to play audio through jack. I don't know if you can do that anymore though. Maybe with the help of Soundflower, it's possible.

Hi What I want is something like jack_capture, capture audio from system speaker and save it to disk, but without modify/setup any other thing like hook chrome to jack to play something. I can simply use this app to capture the audio originated from chrome,  itunes or skype. anything. Is jack capable to do this kind of thing? Or do you know other ways to do this kind of thing? Thank you ----- Original Message ----- From: Kjetil Matheussen <k.s.matheussen(a)gmail.com> To: garden_9652(a)yahoo.co.jp Cc: "k.s.matheussen(a)notam02.no" <k.s.matheussen(a)notam02.no>no>; "jack-devel(a)lists.jackaudio.org" <jack-devel(a)lists.jackaudio.org> Date: 2019/5/14, Tue 18:23 Subject: Re: [Jack-Devel] How to capture audio from speaker? On Tue, May 14, 2019 at 11:16 AM <garden_9652(a)yahoo.co.jp> wrote: The best way is if the program has been written to output it's audio to jack, using the libjack api. Another way is to make an audio pipe, where you have a program/system that creates two virtual audio devices, where the output device sends the audio to the input device. If you have something like that, you can make the output driver the default audio output device (all programs sends to this device), and let jackd connect to the input device. Maybe soundflower can do that, or maybe some other software. You'll have to look around.

On Tue, May 14, 2019 at 1:00 PM Kjetil Matheussen <k.s.matheussen(a)gmail.com> wrote: That sentence should say "that does this for you without installing a virtual driver". Another solution is to physically cable up output to input on your soundcard.