- 原文链接 : How To Stream RTMP live in Android
- 原文作者 : Mohit Gupt
- 译文出自 : 开发技术前线 www.devtf.cn
- 译者 : ayyb1988
- 校对者: chaossss
- 状态 : 完成
在android上，视频/音频流直播是极少有人关注的一部分。每当我们讨论流媒体，RTMP(Real Time Messaging Protocol)是不可或缺的。RTMP是一个基本的视频/音频直播流协议，但是不幸的是Android标准的VideoView不支持RTMP的播放。因此，如果想在android上播放RTMP直播流，你必须使用支持RTMP协议的库。在本教程中我们将讨论如何通过使用安卓的 [Vitamio]（https://www.vitamio.org/en/） 库播放由 RTMP 协议传输的流媒体。
Android Vitamio 库
Vitamio是一个android和ios上基于FFmpeg的开源项目。Vitamio为我们提供了一个清洁、简单、全面、真实的硬件加速解码器和渲染器API，Vitamio是一个支持多种音视频格式 如 FLV, TS/TP, WMV, DivX, Xvid等多种标准格式的非常强大的库。所不同的是，它也支持类似.mkv和.srt嵌入和外挂字幕播放。但是它带有一个许可证，因此在使用它之前请先获得认证。在这个android RTMP例子中，我们不仅讨论RTMP直播流，而且也会讨论m3u8流（HLS），RTSP流和 MMS (Microsoft Media Stream)。首先让在我们的项目中引用Vitamio库。
在Android Studio中引用Vitamio库的步骤如下：
- 下载Vitamio bundle https://github.com/yixia/VitamioBundle
- 解压并且在Android Studio上File->Import Module
- 指定到VitamioBundle路径，选择vitamio文件夹 点击完成
- 在build.gradle(Module: app)依赖部分添加依赖项目(‘:vitamio’)
- 打开build.gradle (Module: vitamio) - 改变最小sdk版本为7
- 不要忘记在manifest.xml中添加internet权限
- 完成！
Android RTMP流
在讲述如何使用之前，让我们先了解下RTMP。Real Time Messaging Protocol (RTMP)是一个Adobe Systems所拥有的一个协议。该协议是Adobe公司拥有的开发音视频流的flash player。后来该协议的部分被公开，供公众使用。更多请查看这里.这个协议大多用于IPTV和实时视频点播流，但它也用于其他领用。
在android上，标准的VideoView不支持RTMP播放。但WebView可以播放RTMP流。这解决了播放RTMP流的问题，但是我认为web apps 不能提供一个很好的界面和体验。因此这这个android RTMP例子中我们将运用第三方库-Vitamio 直播RTMP流的流媒体。在工程中引用Vitamio之后，请在你的layout文件添加Vitamio的VideoView：
activity_main.xml
<code class="language-xml hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> <span class="hljs-pi" style="color: rgb(0, 102, 102); box-sizing: border-box;"><?xml version="1.0" encoding="utf-8"?></span>
<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">LinearLayout</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">xmlns:android</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"http://schemas.android.com/apk/res/android"</span>
<span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_width</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"match_parent"</span>
<span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_height</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"match_parent"</span>
<span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:orientation</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"vertical"</span> ></span>
<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">io.vov.vitamio.widget.VideoView
</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:id</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@+id/vitamio_videoView"</span>
<span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_width</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"wrap_content"</span>
<span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:layout_height</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"wrap_content"</span> /></span>
<span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">LinearLayout</span>></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul>
另外请编写你的activity如下：
MainActivity.java
<code class="language-java hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">package</span> com.truiton.rtmpplayer;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> android.net.Uri;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> android.os.Bundle;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> android.support.v7.app.ActionBarActivity;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.util.HashMap;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> io.vov.vitamio.LibsChecker;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> io.vov.vitamio.MediaPlayer;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> io.vov.vitamio.widget.MediaController;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> io.vov.vitamio.widget.VideoView;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">MainActivity</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ActionBarActivity</span> {</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> String TAG = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"MainActivity"</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> String path;
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//private HashMap<String, String> options;</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> VideoView mVideoView;
<span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">protected</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onCreate</span>(Bundle savedInstanceState) {
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>.onCreate(savedInstanceState);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!LibsChecker.checkVitamioLibs(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>))
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span>;
setContentView(R.layout.activity_main);
mVideoView = (VideoView) findViewById(R.id.vitamio_videoView);
path = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"rtmp://rrbalancer.broadcast.tneg.de:1935/pw/ruk/ruk"</span>;
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">/*options = new HashMap<>();
options.put("rtmp_playpath", "");
options.put("rtmp_swfurl", "");
options.put("rtmp_live", "1");
options.put("rtmp_pageurl", "");*/</span>
mVideoView.setVideoPath(path);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//mVideoView.setVideoURI(Uri.parse(path), options);</span>
mVideoView.setMediaController(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> MediaController(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>));
mVideoView.requestFocus();
mVideoView.setOnPreparedListener(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> MediaPlayer.OnPreparedListener() {
<span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onPrepared</span>(MediaPlayer mediaPlayer) {
mediaPlayer.setPlaybackSpeed(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1.0</span>f);
}
});
}
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li></ul>
虽然上面代码很清晰明了，但需要指出的是请修改你播放RTMP流的路径。在android上，有时可能使用带报头路径来播放RTMP流。幸运的是，Vitamio RTMP播放器也支持这种方式。因此，所有类型的RTMP流可以使用Vitamio库。上面的例子会是这个样子：
Android RTSP流媒体
实时流协议(RTSP)通过多媒体服务器传输内容，例如YouTube使用RTSP流发布内容。关于RTSP流比较容易的部分是，它可以通过android标准的VideoView来完成，想了解更多，请参考我的VideoView例子。
但是如果你使用Vitamio库，可以更好的播放RTSP流。事实上Vitamio也支持RTSP流的回播。和上面过程是一样的，包括Vitamio的VideoView在布局文件，并使用路径变量指定的RTSP url
<code class="language-java hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> mVideoView = (VideoView) findViewById(R.id.vitamio_videoView);
path = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov"</span>;
mVideoView.setVideoPath(path);
mVideoView.setMediaController(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> MediaController(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>));
mVideoView.requestFocus();
mVideoView.setOnPreparedListener(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> MediaPlayer.OnPreparedListener() {
<span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onPrepared</span>(MediaPlayer mediaPlayer) {
mediaPlayer.setPlaybackSpeed(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1.0</span>f);
}
});</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul>
Android m3u8 流媒体
“如何在android上播放m3u8视频”是android开发者最常见的问题之一。通过Http 协议进行视频流直播最简单的办法就是使用标准的 VideoView. 但只能在android3.0以上的设备上播放m3u8流。因为在Android 3.0引入HTTP/ HTTPS直播和HTTP/ HTTPS渐进式流媒体协议，在android3.1完全支持HTTPS。
如果你希望在早期的版本上实现支持android m3u8流的HTTP实时流媒体 (HLS)。应该考虑使用Vitamio库，这个库支持在android API7以上播放m3u8。使用方式，同样的在布局文件中使用Vitamio的VideoView，并指定的HTTP实时流媒体URL。
<code class="language-java hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> mVideoView = (VideoView) findViewById(R.id.vitamio_videoView);
path = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"http://93.184.221.133/00573D/236/236-0.m3u8"</span>;
mVideoView.setVideoPath(path);
mVideoView.setMediaController(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> MediaController(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>));
mVideoView.requestFocus();
mVideoView.setOnPreparedListener(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> MediaPlayer.OnPreparedListener() {
<span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onPrepared</span>(MediaPlayer mediaPlayer) {
mediaPlayer.setPlaybackSpeed(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1.0</span>f);
}
});</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul>
Playing m3u8 stream on Android with Vitamio would look something like this:
在androi上使用Vitamio播放m3u8流效果如下：
Android MMS 流
Vitamio库是一个强大的库，还支持Microsoft媒体服务器（MMS）流中的播放。 MMS是网络流媒体协议，主要用于网络广播和电台直播。使用Vitamio用于在anroid的MMS流和其他协议没有什么不同。所有你需要做的只是更换路径变量指向一个MMS url：
<code class="language-java hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> mVideoView = (VideoView) findViewById(R.id.vitamio_videoView);
path = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"mms://beotelmedia.beotel.net/studiob"</span>;
mVideoView.setVideoPath(path);
mVideoView.setMediaController(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> MediaController(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>));
mVideoView.requestFocus();
mVideoView.setOnPreparedListener(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> MediaPlayer.OnPreparedListener() {
<span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onPrepared</span>(MediaPlayer mediaPlayer) {
mediaPlayer.setPlaybackSpeed(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1.0</span>f);
}
});</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul>
结论
通过上面的讨论，可以确定地说，Vitamio是一个强大的多平台库（ios and android）。通过使用Vitamio库 能播放多种类型的视频格式和协议如RTMP, RTSP, HTTP Live, and HTTP渐进式流协议。另外一个很好的功能是，vitamio支持字幕和多音轨的播放。Vitamio的唯一的缺点是，它不是完全的开源。您可能需要购买许可证来使用它。希望这会有所帮助。通过Facebook, Google+ and Twitter来联系我们获取更多更新。
