[英]How to stream a webcam with Python using socket, pickle, and OpenCV?
[英]I want to stream a webcam feed using socket programming in Python
這是我的代碼:
#The server receives the data
import socket
from PIL import Image
import pygame,sys
import pygame.camera
from pygame.locals import *
import time
host = "localhost"
port = 1890
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((host,port))
s.listen(1)
conn, addr = s.accept()
print "connected by",addr
screen = pygame.display.set_mode((640,480))
while 1:
data = conn.recv(921637)
image = pygame.image.fromstring(data,(640,480),"RGB")
screen.blit(image,(0,0))
pygame.display.update()
if not image:
break;
conn.send(data)
conn.close()
#The client sends the data
import socket
from PIL import Image
import pygame,sys
import pygame.camera
from pygame.locals import *
import time
host = "localhost"
port = 1890
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
pygame.init()
pygame.camera.init()
cam = pygame.camera.Camera("/dev/video0",(640,480))
cam.start()
while 1:
image = cam.get_image()
data = pygame.image.tostring(image,"RGB")
s.sendall(data)
s.close()
print "recieved", repr(data)
只是為了測試,我嘗試了以下代碼並且它工作正常,但上面沒有......
在沒有套接字的情況下實現時的工作代碼:camcapture.py
import sys
import time
import pygame
import pygame.camera
from pygame.locals import *
pygame.init()
pygame.camera.init()
cam = pygame.camera.Camera("/dev/video0",(640,480))
cam.start()
screen = pygame.display.set_mode((640,480))
while 1:
image = cam.get_image()
data = pygame.image.tostring(image,"RGB")
img = pygame.image.fromstring(data,(640,480),"RGB")
screen.blit(img,(0,0))
pygame.display.update()
錯誤是:
image = pygame.image.fromstring(data,(640,480),"RGB")
ValueError: String length does not equal format and resolution size
我哪里做錯了?
問題不在於相機。
問題是您在套接字上發送了一個非常大的字符串,並且錯誤地認為您可以使用conn.recv(921637)
一次讀取整個字符串。
您必須多次調用recv
才能接收所有數據。 嘗試打印的長度data
,你在發送client.py
並打印長度data
在server.py
調用之前pygame.image.fromstring
,你會看到。
有幾種方法可以解決這個問題:
這是一個簡單的例子:
import socket
import pygame
import time
host = "localhost"
port = 1890
pygame.init()
image = pygame.surface.Surface((640, 480))
i=0
j=0
while 1:
image.fill((i,j,0))
i+=10
j+=5
if i >= 255: i = 0
if j >= 255: j = 0
data = pygame.image.tostring(image,"RGB")
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
s.sendall(data)
s.close()
time.sleep(0.5)
import socket
import pygame
host="localhost"
port=1890
screen = pygame.display.set_mode((640,480))
while 1:
s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((host,port))
s.listen(1)
conn, addr = s.accept()
message = []
while True:
d = conn.recv(1024*1024)
if not d: break
else: message.append(d)
data = ''.join(message)
image = pygame.image.fromstring(data,(640,480),"RGB")
screen.blit(image,(0,0))
pygame.display.update()
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