ffmpeg -f dshow -i video="HD Pro Webcam C920" -deinterlace -vcodec libx264 -pix_fmt yuv420p -preset medium -g 60 -b:v 2500k -acodec libmp3lame -ar 44100 -threads 6 -qscale 3 -b:a 712000 -bufsize 512k out.mp4
ffmpeg -f v4l2 -framerate 30 -video_size 640x480 -i /dev/video0 /opt/live/output.mp4

sudo ffmpeg -f v4l2 -framerate 15 -video_size 640x480 -i /dev/video0 -deinterlace -vcodec libx264 -pix_fmt yuv420p -preset medium -g 60 -b:v 2500k -acodec libmp3lame -ar 44100 -threads 6 -qscale 3 -b:a 712000 -bufsize 512k /opt/live/live.mp4