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def _create_config():
    return {"foo_key":0}   

def create_foo_thing():
    config = _create_config()
    return config

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def prepare_frame(np_arr_shape, frames_written):
    """Emulate an I/O limited step that returns a frame,
    e.g. reading from a quick-to-decode file. Note that we could instead simulate
    a CPU intensive task here and the resulting benchmark runs much faster
    when using multiprocessing than multithreading.
    
    :param Tuple[int, int] np_arr_shape: Dimension of the numpy array to be produced. 
    :param int frames_written:
    """
    frame = np.ones(np_arr_shape) * frames_written

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def worker_producer_shared_memory(np_arr_shape, shared_memory, n_frames):
    """A frame producer function that writes to shared memory"""
    mp_array, np_array = shared_memory
    for _ in range(n_frames):
        mp_array.acquire()
        np_array[:] = prepare_random_frame(np_arr_shape)  # produce a fresh array

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for _ in range(n_frames):
    # produce the frame
    np_arr = prepare_random_frame(np_arr_shape) 
    # consume the frame and do some example processing
    _ = np_arr.astype("uint8").copy() * 2

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def seekTo(cap, position):
	''' 
  	Work around bug in OpenCV set method: https://github.com/opencv/opencv/issues/9053
  
	The alternative routine to seek in the video file, a bit slow.
	Required because FFMPEG can seek only to closest I-frames and we
	have to manually read all the P-frames until we reach the position
	'''
	positiontoset = position
	pos = -1

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import cv2

cap = cv2.VideoCapture("myvideo.mkv")

while(True):
    # Capture frame-by-frame
    ret, frame = cap.read()
    if not ret:
        break

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#!/usr/bin/env bash
set -Eeuxo pipefail
# If running this script on a Greengrass v2 device, it should return a dictionary containing temporary credentials.
# If it fails, check if the THING_NAME, ROLE_ALIAS and IOT_GET_CREDENTIAL_ENDPOINT are correct
# IOT_GET_CREDENTIAL_ENDPOINT can be verified via running ` aws iot describe-endpoint --endpoint-type iot:CredentialProvider --output text`
# on a different device with sufficent IAM to run this command, in the same AWS account and region. 

THING_NAME=`sudo cat /greengrass/v2/config/effectiveConfig.yaml | grep -i thingName | awk '{ print $2 }' | tr -d '"'`
ROLE_ALIAS=`sudo cat /greengrass/v2/config/effectiveConfig.yaml | grep -i rolealias | awk '{ print $2 }' | tr -d '"'`
IOT_GET_CREDENTIAL_ENDPOINT=`sudo cat /greengrass/v2/config/effectiveConfig.yaml | grep iotCredEndpoint | awk '{print $2}' | tr -d '"'`