Issue with compatibility picamera

[JolleJolles]

I am trying to use runp with a python script that runs the camera on a raspberrypi with picamera. Although this works with python and in the script, I always get an error with runp:
picamera.exc.PiCameraRuntimeError: Cannot query frame information when camera is not recording

The script is as simple as

from picamera import PiCamera
from time import sleep

def test():
        camera = PiCamera()
        camera.start_preview()
        camera.start_recording('/home/pi/video.h264')
        sleep(10)
        camera.stop_recording()
        camera.stop_preview()

and the code I run: runp test.py test

[JolleJolles]

By running import picamera and then calling picamera.PiCamera() it does work so it it to do with how the libraries are loaded?