"Static" in preview window when using python picamera

[Henry]

from the command line, I type:
raspivid -md 6 -p 50,50,320,240
and get a nice preview window

when I attempt to do this in python:

import time
import picamera

camera = picamera.PiCamera(sensor_mode=6)
camera.start_preview(fullscreen=False, window = (20,20,320,240))
time.sleep(10)
camera.stop_preview()

I get static surrounding the video.

Any ideas?

[Henry]

here’s the missing python code:
`import time
import picamera

camera = picamera.PiCamera(sensor_mode=6)
camera.start_preview(fullscreen=False, window = (20,20,320,240))
time.sleep(10)
camera.stop_preview()

[Henry]

I found that the fix in the thread “Using Python picamera and opencv” worked for me as well.

The solution was to add camera.framerate=60 following the instantiation of the camera object.

[mwlinder]

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)

[Anonymous]

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.

[Author]

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