前言

網(wǎng)絡攝像頭的視頻流解析直接使用通過http的Mjpeg是具有邊界幀信息的multipart / x-mixed-replace，而jpeg數(shù)據(jù)只是以二進制形式發(fā)送。因此，實際上不需要關心HTTP協(xié)議標頭。所有jpeg幀均以marker開頭，0xff 0xd8并以結尾0xff 0xd9。因此，上面的代碼從http流中提取了此類幀，并將其一一解碼。像下面

...(http)0xff 0xd8 --|[jpeg data] |--this part is extracted and decoded0xff 0xd9 --|...(http)0xff 0xd8 --|[jpeg data] |--this part is extracted and decoded0xff 0xd9 --|...(http)

如果圖像的獲取是從tcp網(wǎng)絡中傳輸?shù)奖镜剡M行解析需要對bytes類型數(shù)據(jù)進行解碼

在使用OpenCV直接調用網(wǎng)絡攝像頭時可能會出現(xiàn)

Cam not found

這時候就需要下面這種辦法

代碼： 幀解析

import cv2cap = cv2.VideoCapture(’http://localhost:8080/frame.mjpg’) while True: ret, frame = cap.read() print(frame) if ret == True: cv2.imshow(’Video’, frame) if cv2.waitKey(1) == 27: exit(0)

視頻流解析

import cv2import requestsimport numpy as np r = requests.get(’http://192.168.1.xx/mjpeg.cgi’, auth=(’user’, ’password’), stream=True)if(r.status_code == 200): bytes = bytes() for chunk in r.iter_content(chunk_size=1024): bytes += chunk a = bytes.find(b’xffxd8’) b = bytes.find(b’xffxd9’) if a != -1 and b != -1: jpg = bytes[a:b+2] bytes = bytes[b+2:] i = cv2.imdecode(np.fromstring(jpg, dtype=np.uint8), cv2.IMREAD_COLOR) cv2.imshow(’i’, i) if cv2.waitKey(1) == 27:exit(0)else: print('Received unexpected status code {}'.format(r.status_code))

以上就是python3從網(wǎng)絡攝像機解析mjpeg http流的示例的詳細內容，更多關于python 解析mjpeg http流的資料請關注好吧啦網(wǎng)其它相關文章！