2streams with fake device : working

#!/bin/bash

DST="/tmp/2stream_$(date "+%Y.%m.%d_%H.%M.%S").mp4"

gst-launch-1.0 -e \
    videotestsrc pattern=18 \
        ! "video/x-raw, width=(int)320, height=(int)240, format=(string)I420, framerate=(fraction)30/1" \
        ! x264enc speed-preset=fast \
        ! mux. \
    videotestsrc pattern=18 \
        ! "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.