gst-launch-0.10 -e videomixer name=mix \
   ! ffmpegcolorspace \
   ! x264enc pass=4 quantizer=23 threads=0 \
   ! queue \
   ! mux. \
   v4l2src device=/dev/video1 \
     ! ffmpegcolorspace \
     ! video/x-raw-yuv,width=320, height=240,format=\(fourcc\)AYUV  \
     ! videobox border-alpha=1.0 right=0 top=0 \
     ! mix. \
   v4lsrc device=/dev/video2 \
     ! ffmpegcolorspace \
     ! video/x-raw-yuv,width=800, height=600,format=\(fourcc\)AYUV \
     ! videobox border-alpha=0 top=0 left=-320 \
     ! mix. \
   multifilesrc location="test_320_360.jpg" caps="image/jpeg,framerate=1/1" \
     ! jpegdec \
     ! ffmpegcolorspace\
     ! video/x-raw-yuv,format=\(fourcc\)AYUV \
     ! videobox border-alpha=0 top=-240 left=0 \
     ! mix. \
   pulsesrc ! audioconvert \
      ! 'audio/x-raw-int,rate=44100,channels=2' \
      ! faac tns=true \
      ! queue \
      ! ffmux_mp4 name=mux \
   mux. ! filesink location=test.mkv