gtk-recordmydesktop and hardware (usb and record from sound card)
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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.