capturing screen using vlc
screen capture using vlc and external usb microphone:
cvlc screen:// --screen-fps 20 --input-slave="pulse://alsa_input.usb-0b0e_Jabra_SPEAK_510_USB_1C48F9E60C09020A00-00-USB.analog-mono" --sout='#transcode{vcodec=theo,quality=10,fps=20,acodec=flac}:std{access=file,mux=ogg,dst=test.ogg}'
source: http://www.videolan.org/doc/streaming-howto/en/ch03.html