meta,
    args = {
         "rtpsession name=rtpsess   videotestsrc num-buffers=10 ! video/x-raw,format=RGB,width=\"320\",height=\"240\" ! rtpvrawpay ! rtpsess.send_rtp_sink   rtpsess.send_rtp_src   ! rtpvrawdepay ! fakesink",
    },
    configs = {
       "$(validateflow), pad=fakesink0:sink, record-buffers=true, caps-properties={ media, clock-rate, encoding-name, sampling, depth, width, height, colorimetry, payload, a-framerate };",
    }