2streams with real device not working

#!/bin/bash

GRABBER_DEVICE=/dev/video1 ; # this a DataPath-E1S
WEBCAM_DEVICE=/dev/video0
LOGO_PATH=/home/briner/test.png
DST="/tmp/2stream_$(date "+%Y.%m.%d_%H.%M.%S").mp4"

gst-launch-1.0 -e \
    v4l2src device=${WEBCAM_DEVICE} \
        ! "video/x-raw, width=(int)320, height=(int)240, format=(string)I420, framerate=(fraction)30/1" \
        ! x264enc speed-preset=fast \
        ! mux. \
    v4l2src device=${GRABBER_DEVICE} \
        ! "video/x-raw, width=(int)1024, height=(int)768, format=(string)YUY2, framerate=(fraction)30/1" \
        ! videoconvert \
        ! "video/x-raw, width=(int)1024, height=(int)768, format=(string)I420, framerate=(fraction)30/1" \
        ! x264enc speed-preset=fast \
        ! mux. \
    pulsesrc \
        ! audioconvert \
        ! audio/x-raw, rate=44100, channels=2 \
        ! voaacenc \
        ! queue \
        ! mp4mux name=mux \
    mux. ! filesink location="${DST}"

# use vlc to see the mp4.
# you will see that their is either the first stream which are moving
# or the second stream