海康IP攝像頭rtsp解碼（ubuntu上使用）

閒暇時間，搞了個海康IP攝像頭玩一玩，首先你得知道你的IP地址和密碼，這些要是不知道，可以給售後打電話，售後還是可以的。海康的網絡攝像頭雖然可以直接在web端上面直接顯示，但顯然是不可能用這種方法的。

1.把電腦的IP與海康的設置到同一網段後，要開始對視頻進行解碼

2.寫了個demo，簡單暴力的使用opencv直接解碼，不得不說opencv是真的強

# -*- coding: utf-8 -*-
'''
demo
#rtsp://[username]:[password]@[ip]:[port]/
1) username  用戶名，常用 admin
2) password  密碼，nv123
3) ip        攝像頭IP，如 192.168.6.66
4) port      端口號，默認爲 554
'''
import cv2
url = 'rtsp://admin:[email protected]:554/'#根據攝像頭設置IP及rtsp端口
cap = cv2.VideoCapture(url)#讀取視頻流
while(cap.isOpened()):
    # Capture frame-by-frame  
    ret, frame = cap.read()
    # Display the resulting frame  
    cv2.imshow('CameraDemo',frame)
    if cv2.waitKey(1) & 0xFF == ord('q') :
        break

# When everything done, release the capture  
cap.release()
cv2.destroyAllWindows()

上述就能看到攝像頭實時傳回的圖像了。然後又搞了個保存視頻的demo

#-*- coding = utf-8 -*-
import time
import cv2

print cv2
RTSP_URL    = 'rtsp://admin:[email protected]:554/h264/ch1/sub/av_stream'   # your camera's rtsp url
DURATION    = 30   # how many time in seconds you want to capture
OUTPUT_FILE = 'capture_video.mp4'

cap         = cv2.VideoCapture(RTSP_URL)
#fourcc      = cv2.VideoWriter_fourcc('h','2','6','4')
fourcc      = 0x21
#fps         = cap.get(cv2.CAP_PROP_FPS)
fps         = 25
size        = (int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)), int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)))
saver       = cv2.VideoWriter(OUTPUT_FILE, fourcc, fps, size)

print "rtsp_url = %s, fps = %d, size = %s"%(RTSP_URL, fps, size)

got_first_frame = False
frame_count = 0
while True:
    ret, frame = cap.read()
    if not(ret):
        continue
    frame_count += 1
    print "%s: frame %d received" % (time.time(), frame_count)
    if got_first_frame == False:
        start_time = time.time()
        got_first_frame = True

    saver.write(frame)
    now = time.time()
    if int(now - start_time) > DURATION:
        break

這段代碼就能把視頻保存到本地，但是你只能中斷程序後才能看看視頻，不然一邊傳到顯示屏上，一邊保存，那樣會花屏。就直接等保存完了之後再看看拍的視頻