send capture image over udp socket

udp_sender.py

import cv2
import socket
import struct
from datetime import datetime

cap = cv2.VideoCapture(1)
fps = cap.get(cv2.CAP_PROP_FPS)
font = cv2.FONT_HERSHEY_SIMPLEX
JPEG_QUALITY = 70
encode_param = [int(cv2.IMWRITE_JPEG_QUALITY), JPEG_QUALITY]
white = (255,255,255)
black = (0, 0, 0)
FONT_SCALE = 0.5
BUFFER_SIZE = 1024
ADDR  = ("127.0.0.1", 5252)
HEADER_START = b"START"

def build_header(size):
    size = struct.pack("@I", size)
    header = HEADER_START + size
    return header

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

while cap.isOpened():
    ret, frame = cap.read()
    if not ret:
        continue

    
    frame = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    
    # frame = cv2.threshold(frame, 128, 255, cv2.THRESH_BINARY)[1]
    
    result, enc_img = cv2.imencode('.jpg', frame, encode_param)
    data = enc_img.tostring()
    enc_size = len(data)

    #send header
    header = build_header(enc_size)
    sock.sendto(header, ADDR)

    #send data
    counter = 0
    while counter < enc_size:
        buf = data[counter: counter+BUFFER_SIZE]
        sock.sendto(buf, ADDR)
        counter += BUFFER_SIZE

    cv2.putText(frame, str(enc_size), (10,15), 
        font, FONT_SCALE, black, 2, cv2.LINE_AA)
    

    cv2.imshow("source", frame)

    if cv2.waitKey(1)== 27:
        break
 
cap.release()
cv2.destroyAllWindows()