meta,
    args = {
        "videotestsrc num-buffers=5 ! video/x-raw,framerate=25/1,width=320,height=240 ! vtenc_h264 name=enc allow-frame-reordering=false ! fakesink",
    },
    configs = {
       "$(validateflow), pad=enc:src, record-buffers=true",
    }
