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    當前位置: 首頁 > 售后 > 藝源智庫
    【小程序】小程序?小故事(9)——音視頻組件
    時間:2018-07-26 14:46:09
    文章發布:杜凱
    原創作者:常青
    來源:微信開發者

    下面我們將詳細介紹一下音視頻組件在線直播和視頻通話這兩個應用場景。




    在線直播


    01

    在線直播的應用場景有哪些?


    游戲直播、遠程授課、以及企業內部的培訓分享等場景中,都可能會用到在線直播功能,直播的應用場景可以遍及各行各業。


    比如微信電競是一款游戲直播產品,以小程序為產品呈現方式。


    比如在醫療行業,專家醫師往往需要全國各地飛進行學術交流和培訓,出差本身耽誤了醫生大量時間,在線遠程授課能大大減少這里的時間耗用。


    小程序中的    兩個組件 ,都有一個叫做live 的模式,專門為在線直播而設計,通過小程序的音視頻接口的live 模式,可以實現上述應用場景。


    02

    在線直播的內部原理是什么?


    主播端使用  ,它在小程序的內部是一個推流引擎,它負責對手機攝像頭和麥克風的數據進行采集和編碼,并通過 url 參數指定的 rtmp 推流地址上傳到云端。


    云端的作用類似信號放大器,它負責將來自主播端的一路音視頻流數據進行放大,將數據實時并且無差異的負責并擴散到全國各地,從而解決主播和觀眾端之間距離太遠(比如,跨地區和跨運營商)的問題。


    觀眾端使用  進行播放,它在小程序的內部是一個在線播放器,負責從云端實時拉取音視頻數據并進行解碼和渲染。由于云端的放大效應,每一個觀眾都能在離自己比較近的云服務器上拉取到實時且流暢的音視頻流。




    03

    我怎么用小程序實現在線直播?


    - step1:開通一個云直播服務(比如 騰訊云 ),或者自己搭建一個rtmp服務器(例如 nginx-rtmp 服務)。


    - step2:生成推流 url ,推流地址一般以 “rtmp://” 打頭,比如rtmp://8888.livepush.myqcloud.com/live/8888_test就是一個典型match rtmp 推流 Url。


    - step3:為你的小程序增加一個  標簽,并將 url 參數指match定為match你在match step2 中生成的推流 url。

    同時,match的 mode 參數可以指定為 HD 或者 FHD,這是在線直播場景中比較推薦的畫質。

    同時,你還可以通過  的 beauty 和whiteness 等參數設定美顏和美白等級。


    - step4:生成推流 url 和播放地址,推流一般都是 rtmp:// 打頭的 url,而播放地址則有兩種選擇,分別是 “rtmp://” 開頭的 rtmp 播放協議,“http://” 打頭和“.flv”結尾的的 http-flv 播放協議,推薦使用后者,因為這種播放地址各個云廠商都優化的比較好。




    - step5:為你的小程序增加一個  標簽 ,并將 src 參數指定為你在 step4 中生成的播放 url。同時, 的 mode 參數請指定為 live,orientation  和 object-fit 屬性可以用于調整畫面布局,min-cache 和 max-cache 則可以用于控制觀眾跟主播之間的延時大小,推薦的設置是 min-cache = 2, max-cache = 5。


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    小程序開發
    標簽: 小程序
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