Short command to push video from a Video4Linux compatible webcam to RTMP
# Without audio
ffmpeg -re -f v4l2 -i /dev/video0 -f flv -qscale 5 rtmp://[host]/[app]/[stream]
# With Audio
ffmpeg -re -f alsa -i hw:2,0 -f v4l2 -i /dev/video0 -f flv -qscale 5 rtmp://[host]/[app]/[stream]