通过Websocket视频流到< video>标签 [英] Video stream through Websocket to <video> tag
问题描述
我使用Node.js通过Websocket将实时webm视频流式传输到将在标签中播放的网页。
以下是服务器和客户端的代码：
I use Node.js to stream via Websocket a realtime webm video to a webpage which will play it in a tag. The following is the code from both the server and the client:
服务器：
var io = require('./libs/socket.io').listen(8080, {log:false});
var fs = require('fs');
io.sockets.on('connection', function (socket)
{
console.log('sono entrato in connection');
var readStream = fs.createReadStream("video.webm");
socket.on('VIDEO_STREAM_REQ', function (req)
{
console.log(req);
readStream.addListener('data', function(data)
{
socket.emit('VS',data);
});
});
});
客户：
<html>
<body>
<video id="v" autoplay> </video>
<script src='https://localhost/socket.io/socket.io.js'></script>
<script>
window.URL = window.URL || window.webkitURL;
window.MediaSource = window.MediaSource || window.WebKitMediaSource;
if(!!! window.MediaSource)
{
alert('MediaSource API is not available!');
return;
}
var mediaSource = new MediaSource();
var video = document.getElementById('v');
video.src = window.URL.createObjectURL(mediaSource);
mediaSource.addEventListener('webkitsourceopen', function(e)
{
var sourceBuffer = mediaSource.addSourceBuffer('video/webm; codecs="vorbis,vp8"');
var socket = io.connect('http://localhost:8080');
if(socket)
console.log('Library retrieved!');
socket.emit('VIDEO_STREAM_REQ','REQUEST');
socket.on('VS', function (data)
{
console.log(data);
sourceBuffer.append(data);
});
});
</script>
</body>
</html>
我正在使用Chrome 26，我收到此错误：未捕获错误：InvalidAccessError：DOM异常15 。看起来像向append方法提供的缓冲区的类型是错误的。我已经尝试在Blob，Array和Uint8Array中转换它，但没有运气。
I'm using Chrome 26 and i get this error: "Uncaught Error: InvalidAccessError: DOM Exception 15". It seems like the type of the buffer fed to the append method is wrong. I already tried converting it in a Blob, Array and Uint8Array, but with no luck.
推荐答案
您的示例仅包含显示在渲染页面上： http://html5-demos.appspot.com/static/media -source.html
Your example only contains the code that is shown on the rendered page from here: http://html5-demos.appspot.com/static/media-source.html
检查源代码，第155行是你所缺少的：
Check the source code, line 155 is what you are missing:
var file = new Blob([uInt8Array], {type: 'video/webm'});
所以，你需要告诉Blob的内容类型，然后用Uint8Array提供缓冲区（见行171）：
So, you need to tell the Blob the content type and then feed the buffer with Uint8Array (see line 171):
sourceBuffer.append(new Uint8Array(e.target.result));
这篇关于通过Websocket视频流到< video>标签的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
