ALSA command line (which causes the v4l2 stream to drop frames):

./ffmpeg-stax -y -v 2 \
  -f alsa -ar 48000 -ac 2 -i plughw:0 \
  -f video4linux2 -re -tvstd pal -s 768x576 -i /dev/video0 \
  -async 0 -vsync 0 -qscale 6 -aspect 16:9 -ab 128k -r 25 -f avi out.avi

OSS command line, which gives smooth audio and video stream at 25fps:

./ffmpeg-stax -y -v 2 \
  -f oss -ar 48000 -ac 2 -i /dev/dsp \
  -f video4linux2 -re -tvstd pal -s 768x576 -i /dev/video0 \
  -async 0 -vsync 0 -qscale 6 -aspect 16:9 -ab 128k -r 25 -f avi out.avi