525: interframe interval = 1/34.52 s  avg=1/28.30  stddev=1/81.40
  537: interframe interval = 1/37.01 s  avg=1/28.39  stddev=1/78.56
  538: interframe interval = 1/32.61 s  avg=1/28.79  stddev=1/77.70
  527: interframe interval = 1/28.84 s  avg=1/28.42  stddev=1/73.42
  526: interframe interval = 1/27.71 s  avg=1/30.01  stddev=1/101.06