title: Python picamera.split_recording occasionally dropping frames between splits
body: <p>Sample footage of what I'm talking about, the first one happens about 6 seconds in: <a href="https://www.youtube.com/watch?v=BxTM42pAGYw" rel="nofollow noreferrer">https://www.youtube.com/watch?v=BxTM42pAGYw</a></p>
  
  <p>My code: <a href="https://github.com/nicolashahn/pi-helmet-cam/blob/master/camera.py" rel="nofollow noreferrer">https://github.com/nicolashahn/pi-helmet-cam/blob/master/camera.py</a></p>
  
  <p>It seems to be dropping about a second or two of footage between splits, but it doesn't happen often, though enough that it happens several times in that clip. Is there any way around this? What's causing it?</p>