v4l2src is not working on tx2/?

@ShaneCCC
i’m sorry . the order i’m typing is

gst-launch-1.0 v4l2src device="/dev/video0" ! "video/x-bayer, width=640, height=480, format=(string)rggb" ! bayer2rgb ! videoconvert ! xvimagesink -e

 not the  falkesink