ESP32-CAM Python stream

import cv2 as cv
import numpy as np
from urllib.request import urlopen
import os
import datetime
import time
import sys

#change to your ESP32-CAM ip
url="http://192.168.1.149:9601/stream"
CAMERA_BUFFRER_SIZE=4096
stream=urlopen(url)
bts=b''
i=0
while True:    
    try:
        bts+=stream.read(CAMERA_BUFFRER_SIZE)
        jpghead=bts.find(b'\xff\xd8')
        jpgend=bts.find(b'\xff\xd9')
        if jpghead>-1 and jpgend>-1:
            jpg=bts[jpghead:jpgend+2]
            bts=bts[jpgend+2:]
            img=cv.imdecode(np.frombuffer(jpg,dtype=np.uint8),cv.IMREAD_UNCHANGED)
            #img=cv.flip(img,0) #>0:垂直翻轉, 0:水平翻轉, <0:垂直水平翻轉            
            #h,w=img.shape[:2]
            #print('影像大小 高:' + str(h) + '寬：' + str(w))
            img=cv.resize(img,(640,480))
            cv.imshow("a",img)
        k=cv.waitKey(1)
    except Exception as e:
        print("Error:" + str(e))
        bts=b''
        stream=urlopen(url)
        continue
    
    k=cv.waitKey(1)
    # 按a拍照存檔
    if k & 0xFF == ord('a'):
        cv.imwrite(str(i) + ".jpg", img)
        i=i+1
    # 按q離開
    if k & 0xFF == ord('q'):
        break
cv.destroyAllWindows()

it work

there are two types of coders:

1. import cv2
2. import cv2 as cv

I am #2, glad to meet you!

how to import cv2 in to micropython board?

I keep getting error like this

Video capture error:OpenCV(4.5.2) /private/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/pip-req-build-yj1re3p/opencv/modules/imgcodecs/src/loadsave.cpp:736: error: (-215:Assertion failed) !buf.empty() in function 'imdecode'

Then it will reset, hard to get real-time effect.

Any idea what is going on?

@mchen07, Check if jpg contains something before decoding:

if len(jpg):
    img=cv2.imdecode(np.frombuffer(jpg,dtype=np.uint8),cv2.IMREAD_UNCHANGED)
else:
    continue

anyone can tell me why I got this error thanks . and how to deal with it ConnectionRefusedError: [WinError 10061]

@HarryJian622, here are few things you can check to address this issue:

• Can you check it the url is valid (no typos) ?
• Is the server-side application running on the ESP32?
• Is the ESP32 connected to the same network as the client app ?
• Any firewall on your system that may prevent such connections ?