Python Video Streaming beginner error in initializing the camera

Question

I want to make a video stream between my raspberry pi usb cam and my laptop

Client:

import io
import socket
import struct
import time
import pygame.camera

# Connect a client socket to my_server:8000 (change my_server to the
# hostname of your server)
client_socket = socket.socket()
client_socket.connect(('192.168.1.12', 8000))

# Make a file-like object out of the connection
connection = client_socket.makefile('wb')
try:
    with pygame.camera.Camera ()as camera:
        camera.resolution = (640, 480)
        # Start a preview and let the camera warm up for 2 seconds
        camera.start_preview()
        time.sleep(2)

        # Note the start time and construct a stream to hold image data
        # temporarily (we could write it directly to connection but in this
        # case we want to find out the size of each capture first to keep
        # our protocol simple)
        start = time.time()
        stream = io.BytesIO()
        for foo in camera.capture_continuous(stream, 'jpeg'):
            # Write the length of the capture to the stream and flush to
            # ensure it actually gets sent
            connection.write(struct.pack('<L', stream.tell()))
            connection.flush()
            # Rewind the stream and send the image data over the wire
            stream.seek(0)
            connection.write(stream.read())
            # If we've been capturing for more than 30 seconds, quit
            if time.time() - start > 30:
                break
            # Reset the stream for the next capture
            stream.seek(0)
            stream.truncate()
    # Write a length of zero to the stream to signal we're done
    connection.write(struct.pack('<L', 0))
finally:
    connection.close()
    client_socket.close()

but I have this

Error:`Traceback (most recent call last):

  File "camera.py", line 15, in <module> with pygame.camera.Camera ()as camera:
  File "/usr/lib/python2.7/dist-packages/pygame/camera.py", line 100, in __init__
    _check_init()
  File "/usr/lib/python2.7/dist-packages/pygame/camera.py", line 86, in _check_init raise     ValueError("Need to call camera.init() before using.")
  ValueError: Need to call camera.init() before using.

I am new to this programming language so I don't understand how to intalize a camera to use it and its function I found some tutorials online but didnt get the wrong part in my code `

Answer 1

This occurs because you are not initializing pygame before call Camera()

First of all make sure you import all you need :

import pygame
import pygame.camera
from pygame.locals import *

Now you have to initialize pygame and pygame.camera:

pygame.init()
pygame.camera.init()

Finally create the Camera object as you did:

with pygame.camera.Camera ()as camera:
   blablabla...