Javascript 如何从网络摄像头捕获视频并将其上传到服务器?
我正在尝试使用getusermedia录制网络摄像头视频 我跟踪了这个链接 我们如何知道视频是否真的被录制了。webcamstream.record是否正常工作 函数fallback(e){video.src='fallbackvideo.webm';} 函数成功(流){video.src= window.URL.createObjectURL(流);} if(!navigator.getUserMedia){fallback();}else{Javascript 如何从网络摄像头捕获视频并将其上传到服务器?,javascript,html,getusermedia,Javascript,Html,Getusermedia,我正在尝试使用getusermedia录制网络摄像头视频 我跟踪了这个链接 我们如何知道视频是否真的被录制了。webcamstream.record是否正常工作 函数fallback(e){video.src='fallbackvideo.webm';} 函数成功(流){video.src= window.URL.createObjectURL(流);} if(!navigator.getUserMedia){fallback();}else{ getUserMedia({video:true
getUserMedia({video:true},成功,回退);} 在这里,您可以获得有关它的更多信息: 函数fallback(e){video.src='fallbackvideo.webm';} 函数成功(流){video.src= window.URL.createObjectURL(流);} if(!navigator.getUserMedia){fallback();}else{
getUserMedia({video:true},成功,回退);} 在这里,您可以获得有关它的更多信息:
您链接到的问题中的示例使用定期从画布上拍摄的帧/图片,最后使用Whammy转换为
webm
。生成的视频没有声音
幸运的是,您现在可以同时使用这两种功能:
- 客户端媒体记录器API和
- 服务器端WebRTC流记录李>
有关更多详细信息/code/links,请参阅。您链接到的问题中的示例使用定期从画布上拍摄的帧/图片,最后使用Whammy转换为
webm
。生成的视频没有声音
幸运的是,您现在可以同时使用这两种功能:
- 客户端媒体记录器API和
- 服务器端WebRTC流记录李>
有关更多详细信息/代码/链接,请参阅。以下是完整的工作代码,用于录制视频并将其保存到本地以及将其发送到服务器………: 注意:根据您的需要编辑此代码
<html>
<div class="left">
<div id="startButton" class="button">
Start
</div>
<h2>Preview</h2>
<video id="preview" width="160" height="120" autoplay muted></video>
</div>
<div class="right">
<div id="stopButton" class="button">
Stop
</div>
<h2>Recording</h2>
<video id="recording" width="160" height="120" controls></video>
<a id="downloadButton" class="button">
Download
</a>
</div>
<script>
let preview = document.getElementById("preview");
let recording = document.getElementById("recording");
let startButton = document.getElementById("startButton");
let stopButton = document.getElementById("stopButton");
let downloadButton = document.getElementById("downloadButton");
let logElement = document.getElementById("log");
let recordingTimeMS = 5000;
function log(msg) {
//logElement.innerHTML += msg + "\n";
}
function wait(delayInMS) {
return new Promise(resolve => setTimeout(resolve, delayInMS));
}
function startRecording(stream, lengthInMS) {
let recorder = new MediaRecorder(stream);
let data = [];
recorder.ondataavailable = event => data.push(event.data);
recorder.start();
log(recorder.state + " for " + (lengthInMS/1000) + " seconds...");
let stopped = new Promise((resolve, reject) => {
recorder.onstop = resolve;
recorder.onerror = event => reject(event.name);
});
let recorded = wait(lengthInMS).then(
() => recorder.state == "recording" && recorder.stop()
);
return Promise.all([
stopped,
recorded
])
.then(() => data);
}
function stop(stream) {
stream.getTracks().forEach(track => track.stop());
}
startButton.addEventListener("click", function() {
navigator.mediaDevices.getUserMedia({
video: true,
audio: false
}).then(stream => {
preview.srcObject = stream;
downloadButton.href = stream;
preview.captureStream = preview.captureStream || preview.mozCaptureStream;
return new Promise(resolve => preview.onplaying = resolve);
}).then(() => startRecording(preview.captureStream(), recordingTimeMS))
.then (recordedChunks => {
let recordedBlob = new Blob(recordedChunks, { type: "video/webm" });
//upload it to server part start............................
/*you have **recordedBlob** data that is nothing but video data which is getting recorded you can send this data directly to server */
//Here I am writing sample code to send it to server
//making request
var xhr = new XMLHttpRequest();
//creating form data to append files
var fd = new FormData();
//append the recorded blob
fd.append("video",recordedBlob);
//send data to server..............
xhr.send(fd);
//upload it to server part finish............................
recording.src = URL.createObjectURL(recordedBlob);
downloadButton.href = recording.src;
downloadButton.download = "RecordedVideo.webm";
log("Successfully recorded " + recordedBlob.size + " bytes of " +
recordedBlob.type + " media.");
})
.catch(log);
}, false);
stopButton.addEventListener("click", function() {
stop(preview.srcObject);
}, false);
</script>
</html>
开始
预览
停止
记录
下载
让preview=document.getElementById(“preview”);
let recording=document.getElementById(“记录”);
让startButton=document.getElementById(“startButton”);
让stopButton=document.getElementById(“stopButton”);
let downloadButton=document.getElementById(“downloadButton”);
让logElement=document.getElementById(“log”);
让RecordingTimes=5000;
函数日志(msg){
//logElement.innerHTML+=msg+“\n”;
}
函数等待(delayInMS){
返回新承诺(resolve=>setTimeout(resolve,delayInMS));
}
功能开始记录(流、长度){
let recorder=新媒体记录器(流);
让数据=[];
recorder.ondataavailable=event=>data.push(event.data);
recorder.start();
日志(recorder.state+”表示“+(lengthInMS/1000)+“秒…”);
让停止=新承诺((解决、拒绝)=>{
recorder.onstop=解析;
recorder.onerror=event=>reject(event.name);
});
let recorded=等待(lengthInMS)。然后(
()=>recorder.state==“录制”和&recorder.stop()
);
回报你的承诺([
停止,
记录
])
。然后(()=>数据);
}
功能停止(流){
stream.getTracks().forEach(track=>track.stop());
}
addEventListener(“单击”,函数(){
navigator.mediaDevices.getUserMedia({
视频:没错,
音频:错误
})。然后(流=>{
preview.srcObject=流;
downloadButton.href=流;
preview.captureStream=preview.captureStream | | preview.mozCaptureStream;
返回新承诺(resolve=>preview.onplaying=resolve);
}).然后(()=>开始录制(preview.captureStream(),录制时间))
。然后(recordedChunks=>{
让recordedBlob=newBlob(recordedChunks,{type:“video/webm”});
//将其上载到服务器部件启动。。。。。。。。。。。。。。。。。。。。。。。。。。。。
/*您有**recordedBlob**数据,这些数据只是正在录制的视频数据。您可以将这些数据直接发送到服务器*/
//在这里,我正在编写示例代码以将其发送到服务器
//提出请求
var xhr=new XMLHttpRequest();
//创建表单数据以附加文件
var fd=新FormData();
//附加记录的blob
fd.追加(“视频”,录制的BLOB);
//将数据发送到服务器。。。。。。。。。。。。。。
xhr.send(fd);
//将其上载到服务器部件完成。。。。。。。。。。。。。。。。。。。。。。。。。。。。
recording.src=URL.createObjectURL(recordedBlob);
downloadButton.href=recording.src;
downloadButton.download=“RecordedVideo.webm”;
日志(“已成功录制”+recordedBlob.size+“字节数”+
recordedBlob.type+“媒体”);
})
.渔获物(原木);
},假);
stopButton.addEventListener(“单击”,函数(){
停止(preview.srcObject);
},假);
以下是完整的工作代码