esp32cam通过mqtt传输视频python代码

以下是一个ESP32-CAM通过MQTT传输视频的Python代码示例：

import time
import paho.mqtt.client as mqtt
import cv2

# MQTT broker配置信息
mqtt_broker_ip = "192.168.1.10"
mqtt_broker_port = 1883
mqtt_client_id = "esp32cam"
mqtt_username = ""
mqtt_password = ""

# ESP32-CAM相机配置信息
camera_url = "http://192.168.1.20:81/stream"

# MQTT连接回调函数
def on_connect(client, userdata, flags, rc):
    if rc == 0:
        print("Connected to MQTT broker")
        client.subscribe("esp32cam/video")
    else:
        print("Failed to connect to MQTT broker")

# MQTT消息接收回调函数
def on_message(client, userdata, msg):
    print("Received message: " + msg.topic)

# 创建MQTT客户端实例
mqtt_client = mqtt.Client(mqtt_client_id)
mqtt_client.username_pw_set(mqtt_username, mqtt_password)
mqtt_client.on_connect = on_connect
mqtt_client.on_message = on_message

# 连接MQTT broker
mqtt_client.connect(mqtt_broker_ip, mqtt_broker_port)

# 启动MQTT消息处理循环
mqtt_client.loop_start()

# 创建OpenCV视频捕捉实例
capture = cv2.VideoCapture(camera_url)

while True:
    # 从相机捕捉一帧图像
    ret, frame = capture.read()
    if not ret:
        print("Failed to capture frame from camera")
        break

    # 将图像转换为JPEG格式并发布到MQTT broker
    encoded, buffer = cv2.imencode('.jpg', frame)
    mqtt_client.publish("esp32cam/video", buffer.tobytes())

    # 等待一段时间
    time.sleep(0.1)

# 停止MQTT消息处理循环
mqtt_client.loop_stop()

注意：在此示例中，需要将mqtt_broker_ip和mqtt_broker_port更改为MQTT broker的IP地址和端口号，并将camera_url更改为ESP32-CAM相机的地址。另外，还需要安装OpenCV和paho-mqtt库。