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Old 09-07-2010, 08:55 AM   #1
Registered: May 2004
Posts: 166

Rep: Reputation: 17
Smile gtk-recordmydesktop and hardware (usb and record from sound card)

I want to do two different things in gtk-recordmydesktop.

1, record directly from the soundcard (so no distortion from speakers or microphone).

2, record from a usb microphone.

I can do (1) just using sound recorder already, but of course no video.

As far as (2) is concerned, I set advanced->sound to pulse, DEFAULT, or hw:0,0 or hw:x,y (x and y are any combinations of 0, 1, or 2). (all the hw combinations cause gtk-recordmydesktop to crash)

I have a choice between the motherboard (STAC92xx) and the CMI8738 PCI card. (only the latter sees the usb microphone for some reason). The CMI8738 shows up as card 0 in /proc/asound.

Any idea of where I can find what numbers to put in gtk-recordmydesktop->advanced->sound? I am feeling rather stupid, but I couldn't make much sense of what I have found on google.

Plus. I am using fedora core 10 but with a 2.6.29 kernel and I am only running pulseaudio.

Jack looks complicated, but is that the only way to go.

Hope many others find any reply useful.


Last edited by tethysgods; 09-07-2010 at 08:56 AM.
Old 09-08-2010, 10:37 AM   #2
Registered: May 2004
Posts: 166

Original Poster
Rep: Reputation: 17
OK, here it goes.


set all to pulse audio sound server

Then fire up pulseaudio volume control.
You either get chopped up garbage and long periods of silence otherwise
if you don't Click on recording -it says nothing is recording - just leave it up on the screen for now.

then fire up gtk-recordmydesktop

go to advanced->sound and set the device to `pulse' (no quotes)

Make sure that in volume control the default input is set to the usb mic, and start recording.

The sound is clean. (I don't think I missed anything out)

Now, don't change streams! Just look under "change streams" to see if you're picking up the right one. If you try and change streams, recordmydesktop will freeze completely on stopping the recording. You will need ps -ef | grep recordmy to get the process numbers and use kill -9.

OK, that's recording from the mic sorted (I hope it works for you!)

But what about the recording direct from the sound card.

Go to pulseaudio manager and look under devices.

You will see alsa_output_whateveryouseeforyoursystem_playback_0.monitor

now go to the hidden directory ~/.pulse

copy the lotsofgarbagesource file to a spare

then edit in that alsa_output_..... to replace the alsa_input line that was there before

obviosly copy the spare back when you need to revert to microphone.

And there you have it!

I now have a problem with recording using ffmpeg, but I will post a separate question if I can't fix that by tommorrow afternoon.

Hope this is of some use to some of you.


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