用Node.js SDK对视频进行转码的操作步骤及代码示例

转码是将音视频文件转换成另一个或多个音视频文件，以适应不同网络带宽、不同终端设备和不同的用户需求。当控制台创建的转码任务和工作流均无法满足您的使用场景时，可以按需调用SubmitJobs接口进行转码。本文提供了Node.js SDK转码的操作步骤及完整的代码示例。

完整代码

转码相关API调用及参数详细信息请参见提交转码作业。

import Console from '@alicloud/tea-console';
import OpenApi, * as $OpenApi from '@alicloud/openapi-client';
import Env from '@alicloud/darabonba-env';
import Util from '@alicloud/tea-util';
import mts20140618, * as $mts20140618 from '@alicloud/mts20140618';
import * as $tea from '@alicloud/tea-typescript';

/**
 * Node.js环境版本为8.x及以上。
 * 安装阿里云SDK  npm install @alicloud/pop-core --save
 * 安装Credentials工具。  npm install @alicloud/credentials
 * 安装MPS SDK npm install --save @alicloud/mts20140618
 * 
 */
/** 管道ID  可在控制台查看 */
var pipelineId = "d7cedd984be7dd63395c*****"; 
/** 转码模板ID，m3u8模板，按需配置 */
var templateId = "S00000001-100020"; 
var ossLocation = "oss-cn-shanghai";
var bucket = "<bucket name>";
var ossInputObject = "input.mp4";
var ossOutputObject = "output.mp4";


export default class Client {

/** 初始化 Client */
static async createClient(accessKeyId: string, accessKeySecret: string, regionId: string): Promise<mts20140618> {
    let config = new $OpenApi.Config({ });
    config.accessKeyId = accessKeyId;
    config.accessKeySecret = accessKeySecret;
    /** 接口服务地域 */
    config.regionId = "cn-shanghai";
    return new mts20140618(config);
}

static async main(args: string[]): Promise<void> {
    let client = await Client.createClient(Env.getEnv("ALIBABA_CLOUD_ACCESS_KEY_ID"), Env.getEnv("ALIBABA_CLOUD_ACCESS_KEY_SECRET"), args[0]);

    let request = new $mts20140618.SubmitJobsRequest({
        input: inputParam(),
        outputs: outputParam(),
        outputBucket: bucket,
        pipelineId: pipelineId,
        outputLocation: ossLocation
    });
    let response = await client.submitJobs(request);
    Console.log(Util.toJSONString($tea.toMap(response)));
}
}

Client.main(process.argv.slice(2));


function inputParam() {
    var input:any = {};
    input.Location = ossLocation;
    input.Bucket = bucket;
    input.Object = encodeURIComponent(ossInputObject);
    return JSON.stringify(input);
}

function outputParam() {
    var outputOSSObject = encodeURIComponent(ossOutputObject);
    var output:any = {};
    output.OutputObject = outputOSSObject;
    output.TemplateId = templateId;
    /** video参数 */
    var video = {
        'Codec': "H.264",
        'Bitrate': "1500",
        'Width': "1280",
        'Fps': "25",
    };
    /** audio参数 */
    var audio = {
        'Codec': "AAC",
        'Bitrate': "128",
        'Channels': "2",
        'Samplerate': "44100"
    };
    output.Video = JSON.stringify(video);
    output.Audio = JSON.stringify(audio);

    var outputs = new Array();
    outputs.push(output);

    return JSON.stringify(outputs);
}

完整代码

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