example.py

# <script src="https://gist.github.com/saltzmanjoelh/8e8c2029581df349cadc20157efe5b8b.js"></script>
import io
import time
from io import BytesIO
import picamera
import cv2

duration = 5

# Capture slowly with opencv. Still port as well?
cap = cv2.VideoCapture(0)
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 1920)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 1080)
# cap.set(cv2.CAP_PROP_FPS, 30)
if (cap.isOpened() == False):
    print("Unable to read camera feed")
# Camera warm-up time
time.sleep(2)
frame_num = 0
start = time.time()
while int(time.time()) - int(start) < duration:
    ret, frame = cap.read()
    # cap.set(cv2.CAP_PROP_FPS, 30)
    cv2.imwrite(f'opencv_image_{frame_num}.jpg', frame)
    if ret == False:
        print("something went wrong")
        break

    frame_num = frame_num + 1
finish = time.time()
print('Captured %d frames at %.2ffps' % (
    frame_num,
    frame_num / (finish - start)))
cap.release()
# Captured 14 frames at 2.90fps fileSize: 670k


class SplitFrames(object):
    output = None

    def __init__(self):
        self.frame_num = 0
        self.output = None

    def write(self, buf):
        if buf.startswith(b'\xff\xd8'):
            # Start of new frame; close the old one (if any) and
            # open a new output
            if self.output:
                self.output.close()
            self.frame_num += 1
            self.output = io.open('recording_image%02d.jpg' %
                                  self.frame_num, 'wb')
        self.output.write(buf)


# Capture using video port at acceptable speed
with picamera.PiCamera(resolution='1920X1080') as camera:
    camera.vflip = True
    camera.hflip = True
    camera.start_preview()
    # Give the camera some warm-up time
    time.sleep(2)
    output = SplitFrames()
    start = time.time()
    camera.start_recording(output, format='mjpeg')
    camera.wait_recording(duration)
    camera.stop_recording()
    finish = time.time()
print('Recorded %d frames at %.2ffps' % (
    output.frame_num,
    output.frame_num / (finish - start)))
# Recorded 143 frames at 28.34fps fileSize: 75k

# #Capture with still port at slow speed
with picamera.PiCamera(resolution='1920X1080') as camera:
    frame_num = 0
    camera.start_preview()
    captured_image = open('captured_image.jpg', 'wb')
    # my_stream = BytesIO()
    time.sleep(2)
    start = time.time()
    while int(time.time()) - int(start) < duration:
        # camera.capture(my_stream, 'jpeg')
        camera.capture(captured_image)
        frame_num = frame_num + 1
    finish = time.time()
    captured_image.close()
    print('Captured %d frames at %.2ffps' % (
        frame_num,
        frame_num / (finish - start)))
# Captured 8 frames at 1.75fps 12.3 MB