For this challenge you will need:
- A Raspberry Pi with Python 2 installed,
- A PiCamera.
Follow the steps described on the following pages to make sure you have plugged the camera in your raspberry pi and that you have enabled it. Also make sure you have installed the picamera library.
- Connecting and enabling the picamera into the Raspberry Pi: See tutorial from www.raspberrypi.org
- Installing the picamera Python library: See tutorial from www.raspberrypi.org
First we need to write a Python script to take and store a picture every “x” seconds. We will do this using an infinite loop.
To make sure we can exit the loop we will catch a keyboard interrupt (when the user presses CTRL + “C”. This will terminate the program.
The main variable used in this script is the timeInterval variable. Per default we set it to 5 seconds. You may want to change this depending on what you are recording and how long you intend to record it for.
import picamera, time #Initailise the camera camera=picamera.PiCamera() #This will be used to name the pictures once stored. filename = "frame_" timeInterval = 5 # The time interval between two pictures, in seconds #We have left all the settings in case you need to make some adjustments to improve the picture quality camera.hflip = True camera.vflip = True #camera.sharpness = 0 #camera.contrast = 0 #camera.brightness = 50 #camera.saturation = 0 #camera.ISO = 0 #camera.video_stabilization = False #camera.exposure_compensation = 0 #camera.exposure_mode = 'auto' #camera.meter_mode = 'average' #camera.awb_mode = 'auto' #camera.image_effect = 'none' #camera.color_effects = None #camera.rotation = 0 #camera.crop = (0.0, 0.0, 1.0, 1.0) i=1 try: while True: #Infinite Loop camera.capture(filename + str(i) + '.jpg') print(filename + str(i) + '.jpg') time.sleep(timeInterval) i+=1 except KeyboardInterrupt: #Press Ctrl+C to interrupt pass print('All done...')
Now that we have all the pictures stored. We need to combine them into a video clip (.avi).
To do so we will use the following script, from Claude Pageau: Source: https://github.com/pageauc/pi-motion-orig
print "initializing ...." import StringIO import subprocess import os import time import csv from datetime import datetime import cgi, cgitb imageWidth = 1296 imageHeight = 972 # Aspect ratio of video eg 4/3 16/9 Etc. # Note put value in quotes. aspectRatio = "4/3" # Video fps (frames per second) vulue usually between 2 to 30. I recommend 5 fps to start framesPerSec = 5 # Video output filename. # Can also include folder path, othewise file saved to current folder. movieName = "./makemovie.avi" print "makemovie.py" print "============" print "Creating makemovie.txt file of *jpg files in google_drive folder." ls_params = " -t -r ./*jpg > makemovie.txt" exit_status = subprocess.call("ls %s " % ls_params, shell=True) print "Creating movie file %s using makemovie.txt" % ( movieName ) print "Settings = Image W=%s H=%s aspect=%s fps=%s filename=%s" % ( imageWidth, imageHeight, aspectRatio, framesPerSec, movieName ) mencoder_params = "-nosound -ovc lavc -lavcopts vcodec=mpeg4:aspect=%s:vbitrate=8000000 -vf scale=%s:%s -o %s -mf type=jpeg:fps=%s mf://@makemovie.txt" % ( aspectRatio, imageWidth, imageHeight, movieName, framesPerSec ) print "memcoder_params = %s" % ( mencoder_params ) print "Creating Movie. This will take a while ......." print "----------------------------------------------" exit_status = subprocess.call("mencoder %s" % mencoder_params, shell=True) print "makemovie.py" print "============" print "Finished timelapse movie filename= %s" % ( movieName )