549: interframe interval = 1/32.90 s  avg=1/25.22  stddev=1/30.64
  549: interframe interval = 1/46.65 s  avg=1/20.79  stddev=1/32.98
  550: interframe interval = 1/33.06 s  avg=1/21.72  stddev=1/28.92
  549: interframe interval = 1/33.66 s  avg=1/21.82  stddev=1/29.16
  549: interframe interval = 1/24.35 s  avg=1/22.73  stddev=1/30.28
  548: interframe interval = 1/24.01 s  avg=1/23.79  stddev=1/30.91
  550: interframe interval = 1/23.99 s  avg=1/21.94  stddev=1/31.41
  548: interframe interval = 1/34.28 s  avg=1/21.27  stddev=1/28.89