MediaRecorder只记录一帧
MediaRecorder只记录一帧
提问于 2020-09-21 17:17:25
我正在开发一个react本地应用程序，在那里我录制了一个画布，并制作了5秒的视频文件来上传到服务器。一切都很好，除了我所有的webm文件只有一个框架。这是我的密码。请帮我弄清楚这是怎么回事。谢谢!
initMediaRecorder = () => {
const promise = new Promise((resolve) => {
const stream = this.selfieCanvas.captureStream(10);
let mediaRecorder = null;
let options;
if (MediaRecorder.isTypeSupported('video/webm; codecs=vp9')) {
options = { mimeType: 'video/webm; codecs=vp9', videoBitsPerSecond: 2500000 };
} else if (MediaRecorder.isTypeSupported('video/webm;codecs=vp8')) {
options = { mimeType: 'video/webm; codecs=vp8', videoBitsPerSecond: 2500000 };
} else {
options = 'video/vp8'; // Chrome 47
}
try {
mediaRecorder = new MediaRecorder(stream, options);
} catch (e0) {
resolve(null);
}
mediaRecorder.ondataavailable = (event) => {
console.log(`LOG - Data available ${event.data.size}`);
this.sendToSaveVideo(event.data);
};
resolve(mediaRecorder);
});
return promise;
}
captureVideo = async (oldMediaRecorder) => {
this.initMediaRecorder().then((mediaRecorder) => {
if (oldMediaRecorder !== null && typeof oldMediaRecorder !== 'undefined') {
// I don't want to stop previous recorder until I init the next recorder
oldMediaRecorder.stop();
}
if (mediaRecorder !== null) {
mediaRecorder.start();
}
this.captureVideoTimer = setTimeout(() => {
this.captureVideo(mediaRecorder);
}, 5000);
});
}
sendToSaveVideo = async (eventData) => {
const blobChunk = [];
blobChunk.push(eventData);
const video = new Blob(blobChunk, { type: 'video/webm' });
saveBlobToCloud(video); // save the file to cloud
}```回答 1
Stack Overflow用户
发布于 2022-09-21 10:52:04
您没有设置start()，这(可能)使ondataavailable运行每一个帧。
另外，尝试避免像这样使用ondataavailable，onstop正是为此目的而存在的。
如果这不起作用，试着检查画布是否真的在改变框架。
initMediaRecorder = () => {
const promise = new Promise((resolve) => {
const stream = this.selfieCanvas.captureStream(10);
let chunks = [];
let mediaRecorder = null;
let options;
if (MediaRecorder.isTypeSupported('video/webm; codecs=vp9')) {
options = { mimeType: 'video/webm; codecs=vp9', videoBitsPerSecond: 2500000 };
} else if (MediaRecorder.isTypeSupported('video/webm;codecs=vp8')) {
options = { mimeType: 'video/webm; codecs=vp8', videoBitsPerSecond: 2500000 };
} else {
options = 'video/vp8'; // Chrome 47
}
try {
mediaRecorder = new MediaRecorder(stream, options);
} catch (e0) {
resolve(null);
}
mediaRecorder.ondataavailable = (event) => {
chunks.push(event.data);
};
mediaRecorder.onstop = (event) => {
this.sendToSaveVideo(chunks);
};
resolve(mediaRecorder);
});
return promise;
}
captureVideo = async (oldMediaRecorder) => {
this.initMediaRecorder().then((mediaRecorder) => {
if (oldMediaRecorder !== null && typeof oldMediaRecorder !== 'undefined') {
// I don't want to stop previous recorder until I init the next recorder
oldMediaRecorder.stop();
}
if (mediaRecorder !== null) {
// make ondataavailable run every second.
// ondataavailable should not be used as a stop!
mediaRecorder.start(1000);
}
this.captureVideoTimer = setTimeout(() => {
this.captureVideo(mediaRecorder);
}, 5000);
});
}
sendToSaveVideo = async (chuncks) => {
const video = new Blob(chunks, { type: 'video/webm' });
saveBlobToCloud(video); // save the file to cloud
}编辑
而且你不需要每次都声明媒体记录器.
这样的事情会更好：
const stream = selfieCanvas.captureStream(10);
let mediaRecorder = null;
let options;
if (MediaRecorder.isTypeSupported('video/webm; codecs=vp9')) {
options = { mimeType: 'video/webm; codecs=vp9', videoBitsPerSecond: 2500000 };
} else if (MediaRecorder.isTypeSupported('video/webm;codecs=vp8')) {
options = { mimeType: 'video/webm; codecs=vp8', videoBitsPerSecond: 2500000 };
} else {
options = 'video/vp8'; // Chrome 47
}
try {
mediaRecorder = new MediaRecorder(stream, options);
} catch (e0) {
resolve(null);
}
mediaRecorder.ondataavailable = (event) => {
chunks.push(event.data);
};
mediaRecorder.onstop = (event) => {
const video = new Blob(chunks, { type: 'video/webm' });
saveBlobToCloud(video);
chunks = [];
};
// makes ondataavailable run every 5 seconds
mediaRecorder.start(1000);
// a video is made for every 5 seconds
setInterval(function(){
mediaRecorder.stop();
// ondataavailable should be running more often than stop
mediaRecorder.start(1000);
}, 5000);以下是其他一些有用的链接：
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/63997080
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