Great – thanks for letting us know. I was just in the process of trying to reproduce the problem!
One other thing I found in the past with picamera is that sometimes it has issues if you don’t set the resolution along with the camera mode. It shouldn’t matter, but it doesn’t hurt to use:
camera=picamera.PiCamera(sensor_mode = 6, resolution=(640,480))
rather than just setting the sensor_mode.
Depending on the video you are capturing, you might consider turning off the exposure control and automatic white balance functions:
camera.exposure_mode = ‘off’
camera.awb_mode = ‘off’
camera.awb_gains = (1.0,1.0)
Actually, i had the same problem as well. But i did not use that solution to fix the problem, rather it was somewhat an embarrasing reason for why my picture kept have these filler noises. I had written the code and without noticing it, ran it through an earlier version of IDLE (2.x). As soon as i ran it on IDLE3, the filler noise and every other problem solved by itself.
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Henry"Static" in preview window when using python picamera