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當(dāng)前位置： 首頁(yè) > 售后 > 藝源智庫(kù)
【小程序】小程序?小故事(9)——音視頻組件
時(shí)間：2018-07-26 14:46:09
文章發(fā)布：杜凱
原創(chuàng)作者：常青
來(lái)源：微信開(kāi)發(fā)者

下面我們將詳細(xì)介紹一下音視頻組件在線直播和視頻通話這兩個(gè)應(yīng)用場(chǎng)景。




在線直播


01

在線直播的應(yīng)用場(chǎng)景有哪些？


在游戲直播、遠(yuǎn)程授課、以及企業(yè)內(nèi)部的培訓(xùn)分享等場(chǎng)景中，都可能會(huì)用到在線直播功能，直播的應(yīng)用場(chǎng)景可以遍及各行各業(yè)。


比如微信電競(jìng)是一款游戲直播產(chǎn)品，以小程序?yàn)楫a(chǎn)品呈現(xiàn)方式。


比如在醫(yī)療行業(yè)，專家醫(yī)師往往需要全國(guó)各地飛進(jìn)行學(xué)術(shù)交流和培訓(xùn)，出差本身耽誤了醫(yī)生大量時(shí)間，在線遠(yuǎn)程授課能大大減少這里的時(shí)間耗用。


小程序中的  和  兩個(gè)組件 ，都有一個(gè)叫做live 的模式，專門(mén)為在線直播而設(shè)計(jì)，通過(guò)小程序的音視頻接口的live 模式，可以實(shí)現(xiàn)上述應(yīng)用場(chǎng)景。


02

在線直播的內(nèi)部原理是什么？


主播端使用  ，它在小程序的內(nèi)部是一個(gè)推流引擎，它負(fù)責(zé)對(duì)手機(jī)攝像頭和麥克風(fēng)的數(shù)據(jù)進(jìn)行采集和編碼，并通過(guò) url 參數(shù)指定的 rtmp 推流地址上傳到云端。


云端的作用類似信號(hào)放大器，它負(fù)責(zé)將來(lái)自主播端的一路音視頻流數(shù)據(jù)進(jìn)行放大，將數(shù)據(jù)實(shí)時(shí)并且無(wú)差異的負(fù)責(zé)并擴(kuò)散到全國(guó)各地，從而解決主播和觀眾端之間距離太遠(yuǎn)（比如，跨地區(qū)和跨運(yùn)營(yíng)商）的問(wèn)題。


觀眾端使用  進(jìn)行播放，它在小程序的內(nèi)部是一個(gè)在線播放器，負(fù)責(zé)從云端實(shí)時(shí)拉取音視頻數(shù)據(jù)并進(jìn)行解碼和渲染。由于云端的放大效應(yīng)，每一個(gè)觀眾都能在離自己比較近的云服務(wù)器上拉取到實(shí)時(shí)且流暢的音視頻流。




03

我怎么用小程序?qū)崿F(xiàn)在線直播？


- step1：開(kāi)通一個(gè)云直播服務(wù)（比如 騰訊云 ），或者自己搭建一個(gè)rtmp服務(wù)器（例如 nginx-rtmp 服務(wù)）。


- 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(gè)典型match rtmp 推流 Url。


- step3：為你的小程序增加一個(gè)  標(biāo)簽，并將 url 參數(shù)指match定為match你在match step2 中生成的推流 url。

同時(shí)，match的 mode 參數(shù)可以指定為 HD 或者 FHD，這是在線直播場(chǎng)景中比較推薦的畫(huà)質(zhì)。

同時(shí)，你還可以通過(guò)  的 beauty 和whiteness 等參數(shù)設(shè)定美顏和美白等級(jí)。


- 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(kāi)頭的 rtmp 播放協(xié)議，“http://” 打頭和“.flv”結(jié)尾的的 http-flv 播放協(xié)議，推薦使用后者，因?yàn)檫@種播放地址各個(gè)云廠商都優(yōu)化的比較好。




- step5：為你的小程序增加一個(gè)  標(biāo)簽 ，并將 src 參數(shù)指定為你在 step4 中生成的播放 url。同時(shí)， 的 mode 參數(shù)請(qǐng)指定為 live，orientation  和 object-fit 屬性可以用于調(diào)整畫(huà)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(shí)大小，推薦的設(shè)置是 min-cache = 2， max-cache = 5。


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