Python Video Streaming 初学者在初始化相机时出错答案

【问题标题】：Python Video Streaming beginner error in initializing the cameraPython Video Streaming 初学者在初始化相机时出错
【发布时间】：2014-09-22 20:36:10
【问题描述】：

我想在我的树莓派 USB 摄像头和我的笔记本电脑之间制作视频流

客户：

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()

但我有这个

错误：`Traceback（最近一次调用最后一次）：

  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.

我是这种编程语言的新手，所以我不明白如何集成相机以使用它及其功能我在网上找到了一些教程，但我的代码中没有错误的部分 `

【问题讨论】：

标签： python camera video-streaming pydev

【解决方案1】：

这是因为您在调用 Camera() 之前没有初始化 pygame

首先确保你导入所有你需要的东西：

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

现在你必须初始化 pygame 和 pygame.camera：

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

最后像你一样创建Camera对象：

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

【讨论】：