recieve image over udp socket, decode from jpeg work with sample from udp_sender gist

udp_recv.py

import socket
import sys
import struct
import cv2
import numpy as np

BUFFER_SIZE = 1024
ADDR  = ("127.0.0.1", 5252)
HEADER_START = b"START"

# Create a TCP/IP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

sock.bind(ADDR)

buf  = b""

while True:
    data, address = sock.recvfrom(BUFFER_SIZE)
    #Check  for header packet
    #todo: marge header with data in the first packet
    if HEADER_START in data:
        header_index = data.index(HEADER_START)
        pk = data[header_index+len(HEADER_START): header_index+len(HEADER_START)+4]
        size = struct.unpack("@I", pk)[0]
        
        buf  = b""
    
    #read data
    while size > 0:
        data, address = sock.recvfrom(BUFFER_SIZE)
        buf += data
        size -= BUFFER_SIZE

    # print(len(buf))
    np_array = np.fromstring(buf, dtype=np.uint8)
    frame = cv2.imdecode(np_array, -1)

    cv2.imshow("dest", frame)

    if cv2.waitKey(1)== 27:
        break

cv2.destroyAllWindows()