Carry out an observation in The Observer XT Procedure In The Observer XT, choose Observe > Observation > New to create an observation. See  Carry out your observation  in The Observer XT Help. Press the Start observation button and score the data. See Start the observation and Score data in The Observer XT Help. Press the Stop observation button. See Stop the observation in The Observer XT Help. Note IMPORTANT   Allow enough time between the actions. If you start an observation before MediaRecorder is completely open, video recording will not start.