I use v4l2loopback module to create two video device. My intention is to pipe output from primary video device to these two virtual devices. I can do that using ffmpeg:
ffmpeg -f video4linux2 -s 640x480 -r 5 -i /dev/video0 -codec copy -f v4l2 /dev/video2 -codec copy -f v4l2 /dev/video3
But i want to do that using avconv. I try'it as output v4l2 format and video4linux2 but nothing work. I know avconv is very similar to ffmpeg, but do not know how to accomplish what I want using avconv.