Debian jessie / sid

Here is a fast and easy way to record your videos using pulseaudio.

no working!
"ffmpeg -f alsa -i pulse -ac 2 -acodec pcm_s16le -f video4linux2 -s 640x480 -r 30 -i /dev/video0 -threads 0 -vcodec libx264 -vpre lossless_ultrafast test.mkv"

working!
$ avconv -f alsa -i pulse -acodec pcm_s16le -f video4linux2 -s 640x480 -r 30 -i /dev/video0 -threads 0 -vcodec libx264 -preset ultrafast test.mkv


all right!
but jou must install the package " pavucontrol " which work with pulse, and type in command line before
$ pavucontrol
after in the onglet " record " must choose the webcam in use and recording in time ...
and vidéo audio are working in same time...
good luck.