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i'am trying to send video from client to server and showing it at the server side. the probleme is that when i run the code i get an empty non respond window !

here is the code i'am using which i have found here https://stackoverflow.com/a/30988516/4663461

client.py

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

cap=cv2.VideoCapture(path_to_video)
clientsocket=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
clientsocket.connect(('localhost',8089))

while True:
    ret,frame=cap.read()
    data = pickle.dumps(frame)
    clientsocket.sendall(struct.pack("L", len(data))+data)

server.py

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

HOST=''
PORT=8089

s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
print ('Socket created')

s.bind((HOST,PORT))
print ('Socket bind complete')
s.listen(10)
print ('Socket now listening')

conn,addr=s.accept()


data = b''
payload_size = struct.calcsize("L") 
while True:
    while len(data) < payload_size:
        data += conn.recv(4096)
    packed_msg_size = data[:payload_size]
    data = data[payload_size:]
    msg_size = struct.unpack("L", packed_msg_size)[0]
    while len(data) < msg_size:
        data += conn.recv(4096)
    frame_data = data[:msg_size]
    data = data[msg_size:]
    ###

    frame=pickle.loads(frame_data)
    print frame
    cv2.imshow('frame',frame)
Community
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Hen
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3 Answers3

2

I'm kind of late but I've created powerful & threaded VidGear Video Processing python library that now provides NetGear API, which is exclusively designed to transfer video frames synchronously between interconnecting systems over the network in real-time through ZmQ messaging system. Here's a bare-minimum example for your convenience:

A. Server End:(Bare-Minimum example)

Open your favorite terminal and execute the following python code:

Note: You can end streaming anytime on both server and client side by pressing [Ctrl+c] on your keyboard on server end! 

# import libraries
from vidgear.gears import VideoGear
from vidgear.gears import NetGear

stream = VideoGear(source='test.mp4').start() #Open any video stream
server = NetGear() #Define netgear server with default settings

# infinite loop until [Ctrl+C] is pressed
while True:
    try: 
        frame = stream.read()
        # read frames

        # check if frame is None
        if frame is None:
            #if True break the infinite loop
            break

        # do something with frame here

        # send frame to server
        server.send(frame)

    except KeyboardInterrupt:
        #break the infinite loop
        break

# safely close video stream
stream.stop()
# safely close server
writer.close()

B. Client End:(Bare-Minimum example)

Then open another terminal on the same system and execute the following python code and see the output:

# import libraries
from vidgear.gears import NetGear
import cv2

#define netgear client with `receive_mode = True` and default settings
client = NetGear(receive_mode = True)

# infinite loop
while True:
    # receive frames from network
    frame = client.recv()

    # check if frame is None
    if frame is None:
        #if True break the infinite loop
        break

    # do something with frame here

    # Show output window
    cv2.imshow("Output Frame", frame)

    key = cv2.waitKey(1) & 0xFF
    # check for 'q' key-press
    if key == ord("q"):
        #if 'q' key-pressed break out
        break

# close output window
cv2.destroyAllWindows()
# safely close client
client.close()

Note: NetGear currently supports only two ZeroMQ messaging patterns: i.e zmq.PAIR and zmq.REQ and zmq.REP and the supported protocol are: 'tcp', 'upd', 'pgm', 'inproc', 'ipc'

More advanced usage can be found here: https://github.com/abhiTronix/vidgear/wiki/NetGear

abhiTronix
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frame=pickle.loads(frame_data)
print frame
cv2.imshow('frame',frame)
# add this
if cv2.waitKey(1) & 0xFF == ord('q'):
    break
Serhiy Dovgopolik
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I had the same Problem. It turned out to be my laptop. Check your graphics card driver update and your version of python. Not all versions work with opencv properly.

m3ntor
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  • Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Apr 14 '22 at 14:27
  • This does not provide an answer to the question. Once you have sufficient [reputation](https://stackoverflow.com/help/whats-reputation) you will be able to [comment on any post](https://stackoverflow.com/help/privileges/comment); instead, [provide answers that don't require clarification from the asker](https://meta.stackexchange.com/questions/214173/why-do-i-need-50-reputation-to-comment-what-can-i-do-instead). - [From Review](/review/late-answers/31535718) – Dani3le_ Apr 19 '22 at 14:35