我正在尝试将base64块上传到node js服务器并将这些块保存到一个文件中
let chunks = [];
app.post('/api', (req, res) => {
let {blob} = req.body;
//converting chunks of base64 to buffer
chunks.push(Buffer.from(blob, 'base64'));
res.json({gotit:true})
});
app.post('/finish', (req, res) => {
let buf = Buffer.concat(chunks);
fs.writeFile('finalvideo.webm', buf, (err) => {
console.log('Ahh....', err)
});
console.log('SAVED')
res.json({save:true})
});
上面代码的问题是视频不可播放,我不知道为什么我真的做错了什么,我也尝试过可写流,它也不起作用
更新-我
我没有发送blob,而是实现了发送二进制文件,但即使我面临像TypeError这样的问题:第一个参数必须是字符串、Buffer、ArrayBuffer、Array或类似数组的对象。
client. js
postBlob = async blob => {
let arrayBuffer = await new Response(blob).arrayBuffer();
let binary = new Uint8Array(arrayBuffer)
console.log(binary) // logging typed Uint8Array
axios.post('/api',{binary})
.then(res => {
console.log(res)
})
};
server. js
let chunks = [];
app.post('/api', (req, res) => {
let {binary} = req.body;
let chunkBuff = Buffer.from(binary) // This code throwing Error
chunks.push(chunkBuff);
console.log(chunkBuff)
res.json({gotit:true})
});
//Somehow combine those chunks into one file
app.post('/finish', (req, res) => {
console.log('Combinig the files',chunks.length);
let buf = Buffer.concat(chunks);
console.log(buf) //empty buff
fs.writeFile('save.webm', buf, (err) => {
console.log('Ahh....', err)
});
res.json({save:true})
});
更新-二
我能够接收二进制块并附加到流中,但在最终视频中,只有第一个块正在播放,我不知道其他块发生了什么,视频结束。
代码
const writeMyStream = fs.createWriteStream(__dirname+'/APPENDED.webm', {flags:'a', encoding:null});
app.post('/api', (req, res) => {
let {binary} = req.body;
let chunkBuff = Buffer.from(new Uint8Array(binary));
writeMyStream.write(chunkBuff);
res.json({gotit:true})
});
更新-三
我的客户端代码|注意:我尝试过其他方法来上传我已经注释掉的blob
customRecordStream = stream => {
let recorder = new MediaStreamRecorder(stream);
recorder.mimeType = 'video/webm;codecs=vp9';
recorder.ondataavailable = this.postBlob
recorder.start(INT_REC)
};
postBlob = async blob => {
let arrayBuffer = await new Response(blob).arrayBuffer();
let binary = new Uint8Array(arrayBuffer)
axios.post('/api',{binary})
.then(res => {
console.log(res)
})
// let binaryUi8 = new Uint8Array(arrayBuffer);
// let binArr = Array.from(binaryUi8);
// // console.log(new Uint8Array(arrayBuffer))
//
// console.log(blob);
// console.log(binArr)
// let formData = new FormData();
// formData.append('fname', 'test.webm')
// formData.append("file", blob);
//
// console.log(formData,'Checjk Me',blob)
// axios({
// method:'post',
// url:'/api',
// data:formData,
// config: { headers: {'Content-Type': 'multipart/form-data' }}
// }).then(res => {
// console.log(res,'FROM SERBER')
//
// })
//
//
// .then(res => {
// console.log(res)
// })
// this.blobToDataURL(blob, (blobURL) => {
//
// axios.post('/api',{blob:blobURL})
// .then(res => {
// console.log(res)
// })
// })
};
我能够通过在前端使用FileReader
api转换为base64编码来实现此工作。在后端,从发送的数据块创建一个新的Buffer
并将其写入文件流。我的代码示例中的一些关键内容:
fetch
,因为我不想拉入axios
。fetch
时,您必须确保在后端使用body Parser
MediaRecorder
对象上的start
方法的持续时间值),但您需要确保您的后端可以处理传入的数据块的大小。我将我的设置为非常高的50MB
,但这可能不是必需的。/最终
路由中执行此操作。否则,createWriteStream
默认为自动关闭,因此节点
进程将自动执行此操作。完整的工作示例如下:
前端:
const mediaSource = new MediaSource();
mediaSource.addEventListener('sourceopen', handleSourceOpen, false);
let mediaRecorder;
let sourceBuffer;
function customRecordStream(stream) {
// should actually check to see if the given mimeType is supported on the browser here.
let options = { mimeType: 'video/webm;codecs=vp9' };
recorder = new MediaRecorder(window.stream, options);
recorder.ondataavailable = postBlob
recorder.start(INT_REC)
};
function postBlob(event){
if (event.data && event.data.size > 0) {
sendBlobAsBase64(event.data);
}
}
function handleSourceOpen(event) {
sourceBuffer = mediaSource.addSourceBuffer('video/webm; codecs="vp8"');
}
function sendBlobAsBase64(blob) {
const reader = new FileReader();
reader.addEventListener('load', () => {
const dataUrl = reader.result;
const base64EncodedData = dataUrl.split(',')[1];
console.log(base64EncodedData)
sendDataToBackend(base64EncodedData);
});
reader.readAsDataURL(blob);
};
function sendDataToBackend(base64EncodedData) {
const body = JSON.stringify({
data: base64EncodedData
});
fetch('/api', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body
}).then(res => {
return res.json()
}).then(json => console.log(json));
};
后端:
const fs = require('fs');
const path = require('path');
const express = require('express');
const bodyParser = require('body-parser');
const app = express();
const server = require('http').createServer(app);
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json({ limit: "50MB", type:'application/json'}));
app.post('/api', (req, res) => {
try {
const { data } = req.body;
const dataBuffer = new Buffer(data, 'base64');
const fileStream = fs.createWriteStream('finalvideo.webm', {flags: 'a'});
fileStream.write(dataBuffer);
console.log(dataBuffer);
return res.json({gotit: true});
} catch (error) {
console.log(error);
return res.json({gotit: false});
}
});
灵感来自@wilascend答案:
后端侧:
app.use(express.raw());
app.post('/video-chunck', (req, res) => {
fs.createWriteStream('myvideo.webm', { flags: 'a' }).write(req.body);
res.sendStatus(200);
});
前端端:
mediaRecorder.ondataavailable = event => {
if (event.data && event.data.size > 0) {
fetch(this.serverUrl + '/video-chunck', {
method: 'POST',
headers: {'Content-Type': 'application/octet-stream'},
body: event.data
});
}
};
我的快递版本是4.17.1
我今天遇到了与后端解决方案相同的问题,我使用了fs. appendfile
fs.appendFile(Path, rawData, function (err) {
if (err) throw err;
console.log('Chunck Saved!');
})