在Express Js中使用ffmpeg合并视频和音频

Question

我使用FFmpeg-static在我的快车服务器合并音频和视频来自Youtube可读流。我在一个Github repo上找到了一个代码，但该代码正在转换并直接保存到后端根文件夹。我想要的是合并，然后管道它直接传递给最终用户。我找到的代码如下:

router.get('/try', async (req, res)=>{
let vid = ytdl(ytvideoUrl, {filter: format => format.qualityLabel === '144p'})
let aud = ytdl(ytvideoUrl, { quality: 'lowestaudio' })
const ffmpegProcess = cp.spawn(ffmpeg, [
'-loglevel', '8', '-hide_banner',
'-progress', 'pipe:3',
'-i', 'pipe:4',
'-i', 'pipe:5',
'-map', '0:a',
'-map', '1:v',
'-c:v', 'copy',
`videoTitle.mp4`,
], {
windowsHide: true,
stdio: [
'inherit', 'inherit', 'inherit',
'pipe', 'pipe', 'pipe',
],
})
ffmpegProcess.on('close', () => {
console.log("Merging Completed");
})

aud.pipe(ffmpegProcess.stdio[4]);
vid.pipe(ffmpegProcess.stdio[5]);
})

依赖关系:

const cp = require('child_process');
const ytdl = require('ytdl-core')
const ffmpeg = require('ffmpeg-static');

Thanks in Advance:)

Answer 1

你可以试试这个方法

const express = require('express');
const cors = require('cors');
const ytdl = require('ytdl-core');
const app = express();
const cp = require('child_process');
const ffmpeg = require('ffmpeg-static');
const fs = require('fs')
const readline =require('readline')
app.use(express.static(__dirname + "\static"));
app.use('/static', express.static('./static'));
app.listen(3000, () => {
console.log("It Works!");
});
app.get('/download', async (req, res) => {
var url = req.query.url;

res.header("Content-Disposition", `attachment;  filename=video.mp4`)
let video = ytdl(url, {
filter: 'videoonly'
})
let audio = ytdl(url, {
filter: 'audioonly',
highWaterMark: 1 << 25
});
const ffmpegProcess = cp.spawn(ffmpeg, [
'-i', `pipe:3`,
'-i', `pipe:4`,
'-map', '0:v',
'-map', '1:a',
'-c:v', 'copy',
'-c:a', 'libmp3lame',
'-crf', '27',
'-preset', 'veryfast',
'-movflags', 'frag_keyframe+empty_moov',
'-f', 'mp4',
'-loglevel', 'error',
'-'
], {
stdio: [
'pipe', 'pipe', 'pipe', 'pipe', 'pipe',
],
});
video.pipe(ffmpegProcess.stdio[3]);
audio.pipe(ffmpegProcess.stdio[4]);
ffmpegProcess.stdio[1].pipe(res);
let ffmpegLogs = ''
ffmpegProcess.stdio[2].on(
'data',
(chunk) => {
ffmpegLogs += chunk.toString()
}
)
ffmpegProcess.on(
'exit',
(exitCode) => {
if (exitCode === 1) {
console.error(ffmpegLogs)
}
}
)
});