开始混流

package main

import (
    "bytes"
    "crypto/md5"
    "crypto/rand"
    "encoding/hex"
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
    "net/url"
    "strconv"
    "time"
)
// rtc-api.zego.im 表示使用的产品是云通讯产品，包括了实时音视频（Express Video）、实时音频（Express Audio）、低延迟直播（L3）
const DOMAIN = "https://rtc-api.zego.im"

var (
    //请将 appId 修改为你的 appId，appid 为 uint32
    //举例：1234567890
    AppId uint32 = 1234567890
    //请将 serverSecret 修改为你的 serverSecret，serverSecret 为 string
    Secret = ""
)

type MixStartRequest struct {
    Appid     uint64       `json:"Appid"`
    UserId    string       `json:"UserId"`
    Sequence  int64        `json:"Sequence"`
    MixInput  []*MixInput  `json:"MixInput"`
    MixOutput []*MixOutput `json:"MixOutput"`
    MixTaskId string       `json:"TaskId"`
}

type RectInfo struct {
    Top    int32 `json:"Top"`
    Left   int32 `json:"Left"`
    Bottom int32 `json:"Bottom"`
    Right  int32 `json:"Right"`
}

type MixInput struct {
    StreamId  string    `json:"StreamId"`
    RectInfo  *RectInfo `json:"RectInfo"`
}

type MixOutput struct {
    StreamId     string `json:"StreamId"`
    VideoBitrate int32  `json:"VideoBitrate"`
    Fps          int32  `json:"Fps"`
    Height       int32  `json:"Height"`
    Width        int32  `json:"Width"`
}

func main() {
    nonce := make([]byte, 8)
    rand.Read(nonce)
    hexNonce := hex.EncodeToString(nonce)
    ts := time.Now()
    signature := GenerateSignature(AppId, hexNonce, Secret, ts.Unix())
    value := url.Values{}
    value.Add("AppId", strconv.FormatUint(AppId, 10))
    value.Add("SignatureNonce", hexNonce)
    value.Add("Timestamp", strconv.FormatInt(ts.Unix(), 10))
    value.Add("Signature", signature)
    value.Add("Action", "StartMix")
    value.Add("SignatureVersion", "2.0")
    urlData, err := url.Parse(DOMAIN)
    if err != nil {
        fmt.Println(err)
        return
    }
    urlData.RawQuery = value.Encode()
    dataJson, _ := json.Marshal(GenerateStartMixData())
    req, err := http.NewRequest("POST", urlData.String(), bytes.NewBuffer(dataJson))
    if err != nil {
        fmt.Println(err)
        return
    }
    req.Header.Set("Content-Type", "application/json")
    req.Close = true
    client := &http.Client{}
    r, err := client.Do(req)
    if err != nil {
        fmt.Println(err)
        return
    }
    if r.StatusCode != 200 {
        fmt.Printf("status code is:%v", r.StatusCode)
    }
    defer r.Body.Close()
    resp, err := ioutil.ReadAll(r.Body)
    if err != nil {
        return
    }
    fmt.Println(string(resp))
    return
}

//以下示例为 将 streamId 为 "stream1" 的音视频流 与 streamId 为 "stream2" 的音视频流进行混流，混出 streamId 为 "stream3" 的音视频流
func GenerateStartMixData() *MixStartRequest {
    inputs := make([]*MixInput, 0)
    input1 := MixInput{
        StreamId: "stream1",
        RectInfo: &RectInfo{
            Top:    70,
            Left:   100,
            Bottom: 160,
            Right:  260,
        },
    }
    inputs = append(inputs, &input1)
    input2 := MixInput{
        StreamId: "stream2",
        RectInfo: &RectInfo{
            Top:    200,
            Left:   100,
            Bottom: 290,
            Right:  260,
        },
    }
    inputs = append(inputs, &input2)
    output := MixOutput{
        StreamId:     "stream3",
        VideoBitrate: 12000,
        Fps:          15,
        Height:       360,
        Width:        360,
    }
    outputs := append([]*MixOutput{}, &output)
    req := &MixStartRequest{
        Appid:     AppId,
        UserId:    "123",
        Sequence:  123,
        MixInput:  inputs,
        MixOutput: outputs,
        MixTaskId: "123",
    }
    return req
}

//Signature=md5(AppId + SignatureNonce + ServerSecret + Timestamp)
func GenerateSignature(appid uint64, nonce string, appSecret string, timestamp int64) (signature string) {
    data := fmt.Sprintf("%d%s%s%d", appid, nonce, appSecret, timestamp)
    h := md5.New() //规定使用哈希算法中的MD5算法
    h.Write([]byte(data))
    //hex.EncodeToString(h.Sum(nil))输出16进制字符串
    return hex.EncodeToString(h.Sum(nil))
}

# -*- coding: UTF-8 -*-
import hashlib
import secrets
import time

# 生成签名
# Signature=md5(AppId + SignatureNonce + ServerSecret + Timestamp)
from urllib.parse import urlencode

import requests


def GenerateSignature(appId, signatureNonce, serverSecret, timestamp):
    str1 = str(appId) + signatureNonce + serverSecret + str(timestamp)
    hash = hashlib.md5()
    hash.update(str1.encode("utf8"))
    signature = hash.hexdigest()
    return signature


if __name__ == '__main__':
    # 请将 appId 修改为你的 appId，appid 为 数字
    # 举例：1234567890
    appId = 1234567890
    # 请将 serverSecret 修改为你的 serverSecret，serverSecret 为 string
    serverSecret = ""

    signatureNonce = secrets.token_hex(8)
    timestamp = int(time.time())
    sig = GenerateSignature(appId, signatureNonce, serverSecret, timestamp)

    # 以下示例 将 StreamId 为 "stream1" 的音视频流 与 StreamId 为 "stream2" 的音视频流进行混流，混出 StreamId 为 "stream3" 的音视频流
    par = {
        "Action": "StartMix",
        "AppId": appId,
        "Signature": sig,
        "SignatureNonce": signatureNonce,
        "SignatureVersion": "2.0",
        "Timestamp": timestamp,
        "IsTest": "False"
    }
    body = {
        'TaskId': '123',
        'Sequence': 123,
        'UserId': '123',
        'MixInput': [
            {
                'StreamId': 'stream1',
                'RectInfo': {
                    "Top": 70,
                    "Bottom": 160,
                    "Left": 100,
                    "Right": 260,
                },

            },
            {
                'StreamId': 'stream2',
                'RectInfo': {
                    "Top": 200,
                    "Bottom": 290,
                    "Left": 100,
                    "Right": 260,
                },
            }
        ],
        'MixOutput': [{
            'StreamId': 'stream3',
            'Width': 360,
            'Height': 360,
            'VideoBitrate': 12000,
            'Fps': 15
        }]
    }
    url = 'https://rtc-api.zego.im/'
    req = requests.post(url, params=par, json=body)
    print("Url: ", req.url)
    print("StatusCode", req.status_code)
    print("Respone:", req.text)

package org.example;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.util.HashMap;
import java.util.Map;

/**
 * 请先引入 com.alibaba.fastjson，方便构建请求的 body 参数
 */
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class StartMix {

    //
    public static void main(String[] args) {
        // 获取房间内用户数目
        startMixStream();
    }

    /**
     * 发起混流
     */
    public static void startMixStream() {
        // 请填写你从控制台获取的APP ID,
        // 举例：1234567890L
        Long APP_ID = 1234567890L;
        // 请填写你从控制后台获取的 SERVER SECRET，
        // 举例："abcde1234aaaaaaaabbbbbbb"
        String SERVER_SECRET = ;
        // 生成16进制随机字符串(16位)
        byte[] bytes = new byte[8];
        SecureRandom sr = new SecureRandom();
        sr.nextBytes(bytes);
        String signatureNonce = bytesToHex(bytes);
        // 设定时间戳
        long timestamp = System.currentTimeMillis() / 1000L;

        // 生成签名Signature=md5(AppId + SignatureNonce + ServerSecret + Timestamp)
        String signatue = generateSignature(APP_ID, signatureNonce, SERVER_SECRET, timestamp);

        // 组装请求URL
        //以下示例为 将 StreamId 为 "stream1" 的音视频流 与 StreamId 为 "stream2" 的音视频流进行混流，混出 StreamId 为 "stream3" 的音视频流
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("Action", "StartMix");
        params.put("AppId", APP_ID);
        params.put("SignatureNonce", signatureNonce);
        params.put("Timestamp", timestamp);
        params.put("Signature", signatue);
        params.put("SignatureVersion", "2.0");
        // rtc-api.zego.im 表示使用的产品是云通讯产品，包括了实时音视频（Express Video）、实时音频（Express Audio）、低延迟直播（L3）
        String url = buildAPIUrl("https://rtc-api.zego.im/", params);

        JSONObject body = new JSONObject()
                .fluentPut("TaskId", "123")
                .fluentPut("Sequence", 123)
                .fluentPut("UserId", "123");

        JSONArray mixInputList = new JSONArray();
        mixInputList.add(new JSONObject()
                .fluentPut("StreamId", "stream1")
                .fluentPut("RectInfo", new JSONObject()
                        .fluentPut("Top", 70)
                        .fluentPut("Bottom", 160)
                        .fluentPut("Left", 100)
                        .fluentPut("Right", 260)));
        mixInputList.add(new JSONObject()
                .fluentPut("StreamId", "stream2")
                .fluentPut("RectInfo", new JSONObject()
                        .fluentPut("Top", 200)
                        .fluentPut("Bottom", 290)
                        .fluentPut("Left", 100)
                        .fluentPut("Right", 260)));
        body.put("MixInput", mixInputList);

        JSONArray mixOutputList = new JSONArray();
        mixOutputList.add(new JSONObject()
                .fluentPut("StreamId", "stream3")
                .fluentPut("Width", 360)
                .fluentPut("Height", 360)
                .fluentPut("VideoBitrate", 12000)
                .fluentPut("Fps", 15));
        body.put("MixOutput", mixOutputList);

        String result = sendPost(url, body.toString());
        System.out.println(result);
    }

    /**
     * 生成签名
     * @param appId 应用APPID
     * @param signatureNonce 签名随机码
     * @param serverSecret 服务端API密钥
     * @param timestamp 签名时间戳
     * @return 生成的签名字符串
     */
    public static String generateSignature(long appId, String signatureNonce, String serverSecret, long timestamp){
        String str = String.valueOf(appId) + signatureNonce + serverSecret + String.valueOf(timestamp);
        String signature = "";
        try{
            //创建一个提供信息摘要算法的对象，初始化为md5算法对象
            MessageDigest md = MessageDigest.getInstance("MD5");
            //计算后获得字节数组
            byte[] bytes = md.digest(str.getBytes("utf-8"));
            //把数组每一字节换成16进制连成md5字符串
            signature = bytesToHex(bytes);
        }catch (Exception e) {
            e.printStackTrace();
        }
        return signature;
    }

    /**
     * 字节数组转16进制
     * @param bytes 需要转换的byte数组
     * @return 转换后的Hex字符串
     */
    public static String bytesToHex(byte[] bytes) {
        StringBuffer md5str = new StringBuffer();
        //把数组每一字节换成16进制连成md5字符串
        int digital;
        for (int i = 0; i < bytes.length; i++) {
            digital = bytes[i];
            if (digital < 0) {
                digital += 256;
            }
            if (digital < 16) {
                md5str.append("0");
            }
            md5str.append(Integer.toHexString(digital));
        }
        return md5str.toString();
    }

    /**
     * 发送HTTP-GET请求
     * @param httpurl 请求路径
     * @return 响应内容
     */
    public static String sendGet(String httpurl) {
        HttpURLConnection connection = null;
        InputStream is = null;
        BufferedReader br = null;
        String result = null;// 返回结果字符串
        try {
            // 创建远程url连接对象
            URL url = new URL(httpurl);
            // 通过远程url连接对象打开一个连接，强转成httpURLConnection类
            connection = (HttpURLConnection) url.openConnection();
            // 设置连接方式：get
            connection.setRequestMethod("GET");
            // 设置连接主机服务器的超时时间：15000毫秒
            connection.setConnectTimeout(15000);
            // 设置读取远程返回的数据时间：60000毫秒
            connection.setReadTimeout(60000);
            // 发送请求
            connection.connect();
            // 通过connection连接，获取输入流
            if (connection.getResponseCode() == 200) {
                is = connection.getInputStream();
                // 封装输入流is，并指定字符集
                br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                // 存放数据
                StringBuffer sbf = new StringBuffer();
                String temp = null;
                while ((temp = br.readLine()) != null) {
                    sbf.append(temp);
                    sbf.append("\r\n");
                }
                result = sbf.toString();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            if (null != br) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            connection.disconnect();// 关闭远程连接
        }
        return result;
    }

    /**
     * 发送HTTP-POST请求
     * @param param 消息体参数
     * @return 响应内容
     */
    public static String sendPost(String httpUrl, String param) {
        HttpURLConnection connection = null;
        InputStream is = null;
        OutputStream os = null;
        BufferedReader br = null;
        String result = null;
        try {
            URL url = new URL(httpUrl);
            // 通过远程url连接对象打开连接
            connection = (HttpURLConnection) url.openConnection();
            // 设置连接请求方式
            connection.setRequestMethod("POST");
            // 设置连接主机服务器超时时间：15000毫秒
            connection.setConnectTimeout(15000);
            // 设置读取主机服务器返回数据超时时间：60000毫秒
            connection.setReadTimeout(60000);
            // 默认值为：false，当向远程服务器传送数据/写数据时，需要设置为true
            connection.setDoOutput(true);
            // 默认值为：true，当前向远程服务读取数据时，设置为true，该参数可有可无
            connection.setDoInput(true);
            // 设置传入参数的格式:请求参数应该是 name1=value1&name2=value2 的形式。
            connection.setRequestProperty("Content-Type", "application/json");
            // 建立连接
            connection.connect();
            // 通过连接对象获取一个输出流对象
            OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream(),"UTF-8");
            writer.write(param);
            writer.flush();
            // 通过连接对象获取一个输入流，向远程读取
            if (connection.getResponseCode() == 200) {
                is = connection.getInputStream();
                // 对输入流对象进行包装:charset根据工作项目组的要求来设置
                br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                StringBuffer sbf = new StringBuffer();
                String temp = null;
                // 循环遍历一行一行读取数据
                while ((temp = br.readLine()) != null) {
                    sbf.append(temp);
                    sbf.append("\r");
                }
                result = sbf.toString();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            if (null != br) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != os) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            // 断开与远程地址url的连接
            connection.disconnect();
        }
        return result;
    }

    /**
     * 组装API地址字符串
     * @param url API地址
     * @param params 请求参数
     * @return 组装好的API地址字符串
     */
    public static String buildAPIUrl(String url, Map<String, Object> params) {
        if(params.isEmpty()) {
            return url;
        }
        StringBuffer buffer = new StringBuffer(url).append("?");
        for(String key : params.keySet()) {
            buffer.append(key).append("=").append(params.get(key)).append("&");
        }
        String apiurl = buffer.toString();
        if(apiurl.endsWith("&")) {
            return apiurl.substring(0, apiurl.length()-1);
        } else {
            return apiurl;
        }
    }

}

<?php

/**
 * 发起开始混流的最简示例代码
 */

//请将 appId 修改为你的 appId
//举例：1234567890
$appId = 1234567890;
//请将 serverSecret 修改为你的 serverSecret，serverSecret 为 string
$serverSecret = "";

//生成签名
//Signature=md5(AppId + SignatureNonce + ServerSecret + Timestamp)
function GenerateSignature($appId, $signatureNonce, $serverSecret, $timeStamp){
    $str = $appId . $signatureNonce . $serverSecret . $timeStamp;
    //使用PHP中标准的MD5算法，默认返回32字符16进制数
    return md5($str);
}

//取随机字符串并转换为十六进制值
$signatureNonce = bin2hex(random_bytes(8));

//取毫秒级时间戳
list($msec, $sec) = explode(' ', microtime());
$msecTime = (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
//对$msecTime四舍五入取到秒级时间戳
$timeStamp = round($msecTime/1000);
$sig = GenerateSignature($appId, $signatureNonce, $serverSecret, $timeStamp);

//以下示例 将 StreamId 为 "stream1" 的音视频流 与 StreamId 为 "stream2" 的音视频流进行混流，混出 StreamId 为 "stream3" 的音视频流
$url = "https://rtc-api.zego.im/?Action=StartMix&AppId=$appId&SignatureNonce=$signatureNonce&Timestamp=$timeStamp&Signature=$sig&SignatureVersion=2.0&IsTest=false";

$body = [
    "TaskId"   => "123",
    "Sequence" => 123,
    "UserId"   => "123",
    "MixInput" => [
        [
            "StreamId" => "stream1",
            "RectInfo" => [
            "Top"    => 70,
                "Bottom" => 160,
                "Left"   => 100,
                "Right"  => 260,
            ],
        ],
        [
            "StreamId" => "stream2",
            "RectInfo" => [
            "Top"    => 200,
                "Bottom" => 290,
                "Left"   => 100,
                "Right"  => 260,
            ],
        ]
    ],
    "MixOutput" => [
        [
            "StreamId" => "stream3",
            "Width"    => 360,
            "Height"   => 360,
            "VideoBitrate" => 12000,
            "Fps"      => 15
        ]
    ]
];

$post_string = json_encode($body);

$ch = curl_init();

curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_POST, 1);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
//设置请求连接超时时间,单位：秒
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 5);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_string);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
        'Content-Type: application/json; charset=utf-8',
    )
);
$response = curl_exec($ch);
curl_close($ch);

echo "Url:" . $url;
echo "\r\n";
echo "request body:" . $post_string;
echo "\r\n";
echo "response:" . $response;

const crypto = require('crypto');
const request = require('request');

//请将 appId 修改为你的 appId，appid 为 number
var appId = ;
//请将 serverSecret 修改为你的 serverSecret，serverSecret 为 string
var serverSecret = "";

//Signature=md5(AppId + SignatureNonce + ServerSecret + Timestamp)
function GenerateSignature(appId, signatureNonce, serverSecret, timeStamp) {
    const hash = crypto.createHash('md5'); //规定使用哈希算法中的MD5算法
    var str = appId + signatureNonce + serverSecret + timeStamp;
    hash.update(str);
    //hash.digest('hex')表示输出的格式为16进制
    return hash.digest('hex');
}

var signatureNonce = crypto.randomBytes(8).toString('hex');
var timeStamp = Math.round(Date.now() / 1000);
var sig = GenerateSignature(appId, signatureNonce, serverSecret, timeStamp)

//以下示例 将 StreamId 为 "stream1" 的音视频流 与 StreamId 为 "stream2" 的音视频流进行混流，混出 StreamId 为 "stream3" 的音视频流
var url = `https://rtc-api.zego.im/?Action=StartMix&AppId=${appId}&SignatureNonce=${signatureNonce}&Timestamp=${timeStamp}&Signature=${sig}&SignatureVersion=2.0&IsTest=false`
var body = {
    'TaskId': '123',
    'Sequence': 123,
    'UserId': '123',
    'MixInput': [
    {    
        'StreamId': 'stream1',
        'RectInfo': {
            "Top": 70,
            "Bottom": 160,
            "Left": 100,
            "Right": 260,
        },
    }, 
    {
        'StreamId': 'stream2',
        'RectInfo': {
            "Top": 200,
            "Bottom": 290,
            "Left": 100,
            "Right": 260,
        },
    }
    ],
    'MixOutput': [{
        'StreamId': 'stream3',
        'Width': 360,
        'Height': 360,
        'VideoBitrate': 12000,
        'Fps': 15
    }]
}

request({
    url: url,
    method: 'POST',
    json: true,
    headers: {
        'content-type': 'application/json'
    },
    body: body
}, function (error, response, body) {
    console.log(error)
    console.log(response.statusCode)
    if (!error && response.statusCode === 200) {
        console.log(body.Data)
    }
})

例如，在基础请求参数示例中，补充设置背景颜色、背景图片，设置几个扩展参数，参数示例如下：

{
    "TaskId":"2213699902971205739",  # N,string,任务ID，同一个任务需要一致
    "Sequence":1,  # Y,int,混流请求的序列号，修改混流参数时需保证递增
    "UserId":"123",  # Y,string用户ID；
    "RoomId":"321",  # N,string,房间ID；
    "UserData":"DoraTest",  # N,string;自定义用户数据,使用时需要对此参数内容进行 base64 编码,长度限制为 4000 字节,建议不超过 850 字节; 自定义的用户数据将作为 SEI 信息传输给拉流方,拉流方可通过监听客户端的 onPlayerSyncRecvSEI 回调获取该数据;支持混流过程中实时更新
    "SoundLevel":1,  # N,int,混流声浪,1: 开启，0：不开启;默认值是0;支持混流过程中实时更新
    "BackgroundImage":"http://47.101.46.7:8090/no_camera_icon.png",  # N,string,背景图，支持线上URL
    "BackGroundColorHex":"0x87CEFA00",  # N,string,背景颜色
    "ByPass":1,  # N,单流透传开关，也就是输入流就一个的时候是否混流(默认不启用) 1: 启用, 0:不启用
    "AlignmentType":0,
    "MixInput":[
        {
            "RectInfo":{
                "Bottom":640,
                "Layer":1,  # N,int,图层层次
                "Left":0,
                "Right":180,
                "Top":0,
                "CornerRadius": 10 # N,int,圆角半径
                #   原点在左上角,top/bottom/left/right 定义如下：
                #
                #   (left, top)-----------------------
                #   |                                |
                #   |                                |
                #   |                                |
                #   |                                |
                #   -------------------(right, bottom)
            },
            "SoundLevelId":1,
            "StreamId":"stream1",
            "Image": {
                "Url": "http://47.101.46.7:8090/no_camera_icon.png",
                "DisplayMode": 0
            },
            "ContentControl":2, # N,int,内容控制。0：取音视频，1：取音频，2：取视频
            "RenderMode":0,  # N,int,混流输入填充模式。0：裁剪模式，默认值，1：填充模式
            "Volume":100,
            "Label":{
                "Text":"Hello",
                "Left":10,
                "Top":10,
                "Font":{
                    "FontType":1,
                    "FontSize":26,
                    "FontColor":256,
                    "Transparency":50,
                    "BorderColor":0
                }
            }
        },
        {
            "RectInfo":{
                "Bottom":640,
                "Layer":2,
                "Left":180,
                "Right":360,
                "Top":0
            },
            "SoundLevelId":2,
            "StreamId":"stream2",
            "ContentControl":2,
            "RenderMode":0
        }
    ],
    "WaterMark": {
        "Image": "http://47.101.46.7:8090/no_camera_icon.png",# Y,string,水印图片
        "RectInfo": {  # 水印的位置信息;必填
            "Top": 0,  # 必填
            "Left": 0,  # 必填
            "Bottom": 200,  # 必填
            "Right": 150  # 必填
        }
    },
    "CheckImageMode": 0, # N, int, 是否对背景图\输入流占位图\水印图片等参数进行检查, 默认 0
    "MixOutput": [{  # 输出流列表;必填  
        "StreamId": "stream3",  # Y,输入流地址,StreamId 和 StreamUrl 二者取其一即可,若同时填写 StreamId 和 StreamUrl,则 StreamUrl 生效
        #"StreamUrl": "rtmp://ip/appname/streamid", StreamId 和 StreamUrl 二者取其一即可,若同时填写 StreamId 和 StreamUrl,则 StreamUrl 生效
        "VideoBitrate": 1200000,  # Y,int,视频码率（单位：bps）,纯音频混流的时候,推荐填写0;支持混流过程中实时更新
        "Fps": 15,  # Y,int,视频帧率
        "Width": 360,  # Y,int,宽，范围[0-3000];数值必须是2的倍数，纯音频混流的时候,推荐填写0
        "Height": 640,  # Y,int,高，范围[0-3000];数值必须是2的倍数，纯音频混流的时候,推荐填写0
        "AudioCodec": 0,  # N,int,音频编码 0：HE-AAC，1：AAC-LC，2：MP3；默认0
        "AudioBitrate": 48000,  # N,int,混流输出音频码率,默认48000，单位 bps
        "SoundChannel": 2,  # N,int,声道数， 1：单声道，2：双声道
        "VideoEncId": 0,  # N,int,视频编码,0:H264,2:VP8,3:H265,4:H264 SVC
        "ExtraLayers": [ # 当 VideoEncId 取值为 4 时,该字段必填，且长度必须为 1
            {
                "VideoBitrate": 1200000
            }
        ],
        "LowBitrateHD": 0  # N,int,是否开启高清低码,0:不开启(默认),1:开启, 该参数仅在 VideoEncId 取值为 3 时才生效
    }],
    #"ExPara",  # N,扩展参数（json结构体格式),具体联系技术支持,比如video_encode/sei_mode,可参见数据示例
    "ExPara": [
        {
            "Key": "video_encode",
            "Value": "h264"
        },
        {
            "Key": "sei_mode",
            "Value": "1"
        },
        {
            "Key": "mixowner_userid",
            "Value": "[\"456\"]"
        }
    ],
    "RecvBufferLevel": 0 # N, int, 拉流最小缓冲时间(单位：毫秒), 默认 0
}