main.py

import cv2, time, os
vidcap = cv2.VideoCapture("rickroll.mp4")

fps = vidcap.get(cv2.CAP_PROP_FPS)
total_frames = int(vidcap.get(cv2.CAP_PROP_FRAME_COUNT))

spf = 1/fps

thumbprint = []

ascii = [" ",".",":","-","=","+","*","#","%","@"]

max_brightness = 0

while vidcap.isOpened():

    last_time = time.time()

    for frame in range(total_frames):
        success, image = vidcap.read()
        if not success:
            break

        # greyscale
        image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

        # resize to fit the current terminal session
        term_size = os.get_terminal_size()
        max_columns, max_rows = term_size.columns, term_size.lines
        img_columns, img_rows = len(image[0]), len(image)
        fx, fy = max_columns / img_columns, max_rows / img_rows
        image = cv2.resize(image, (0,0), fx = fx, fy = fy)

        string = ""
        for row in range(len(image)):
            for column in range(len(image[0])):
                brightness = (image[row][column] / 255)
                index = round(brightness * len(ascii))
                if index >= len(ascii):
                    # then we'd have an out of bounds error
                    index = len(ascii)-1
                char = ascii[index]
                string += char
            string+="\n"

        # block until appropriate for the frame to display
        blocking = True
        while blocking:
            now = time.time()
            if now >= last_time + spf:
                last_time = now
                blocking = False

        print(string)
#   break