实现功能
点击【选择文件】按钮在弹出的对话框中选择多个视频，这些视频就是一会将要混剪的视频素材，点击【开始处理】按钮之后就会开始对视频进行处理，处理完毕之后会将处理后的文件路径返回，并在页面展示处理后的视频。
视频所作处理：从上传的视频素材中里边的每个视频里边随机抽取 2s，然后将抽取出来的这几个 2s 的视频，随机排序然后进行拼接。
效果展示
代码实现
说明：
前端代码是使用vue编写的。
后端接口的代码是使用nodejs进行编写的。
前端代码
<template><div id="app"><!-- 显示上传的视频 --><div><h2>将要处理的视频</h2><videov-for="video in uploadedVideos":key="video.src":src="video.src"controlsstyle="width: 100px"></video></div><!-- 上传视频按钮 --><input type="file" @change="uploadVideo" multiple accept="video/*" /><hr /><hr /><!-- 显示处理后的视频 --><div><h2>已处理后的视频</h2><videov-for="video in processedVideos":key="video.src":src="video.src"controlsstyle="width: 100px"></video></div><button @click="processVideos">开始处理</button></div>
</template><script setup>
import axios from "axios";
import { ref } from "vue";const uploadedVideos = ref([]);
const processedVideos = ref([]);
let videoIndex = 0;const uploadVideo = async (e) => {const files = e.target.files;console.log(e);for (let i = 0; i < files.length; i++) {const file = files[i];const videoSrc = URL.createObjectURL(file);uploadedVideos.value.push({ id: videoIndex++, src: videoSrc, file });}
};const processVideos = async () => {const formData = new FormData();for (const video of uploadedVideos.value) {// formData.append("video", video.file); // 使用实际的文件对象formData.append("videos", video.file); // 使用实际的文件对象}try {const response = await axios.post("http://localhost:3000/user/process",formData,{headers: {"Content-Type": "multipart/form-data",},});const processedVideoSrc = response.data.path;processedVideos.value.push({id: videoIndex++,src: "http://localhost:3000/" + processedVideoSrc,});} catch (error) {console.error("Error processing video:", error);}
};
</script>补充说明：
accept="video/*"：指定了只接受视频文件类型，这将过滤掉非视频文件，使得用户在选择文件时只能看到并选择视频文件。
video/*：是一个通配符，表示所有已知的视频文件类型。如果你只想接受特定的视频格式（例如MP4和WebM），你可以指定他们，如下所示：
accept=".mp4, .webm"或者，如果你想要更精确地控制，可以使用MIME类型：
accept="video/mp4, video/webm"multiple：表明这个文件输入框允许多个文件的选择。如果没有这个属性，用户每次只能选择一个文件。
后端代码
routers =》users.js
var express = require('express');
var router = express.Router();
const multer = require('multer');
const ffmpeg = require('fluent-ffmpeg');
const path = require('path');
// 视频
const upload = multer({dest: 'public/uploads/',storage: multer.diskStorage({destination: function (req, file, cb) {cb(null, 'public/uploads'); // 文件保存的目录},filename: function (req, file, cb) {// 提取原始文件的扩展名const ext = path.extname(file.originalname).toLowerCase(); // 获取文件扩展名，并转换为小写// 生成唯一文件名，并加上扩展名const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);const fileName = uniqueSuffix + ext; // 新文件名cb(null, fileName); // 文件名}})
});const fs = require('fs');// 处理文件上传
router.post('/upload', upload.single('video'), (req, res) => {const videoPath = req.file.path;const originalName = req.file.originalname;const filePath = path.join('uploads', originalName);fs.rename(videoPath, filePath, (err) => {if (err) {console.error(err);return res.status(500).send("Failed to move file.");}res.json({ message: 'File uploaded successfully.', path: filePath });});
});// 处理多个视频文件上传
router.post('/process', upload.array('videos', 10), (req, res) => {const videoPaths = req.files.map(file => path.join(path.dirname(__filename).replace('routes', 'public/uploads'), file.filename));const outputPath = path.join('public/processed', 'merged_video.mp4');const concatFilePath = path.resolve('public', 'concat.txt').replace(/\\/g, '/');//绝对路径// 创建 processed 目录（如果不存在）if (!fs.existsSync("public/processed")) {fs.mkdirSync("public/processed");}// 计算每个视频的长度const videoLengths = videoPaths.map(videoPath => {return new Promise((resolve, reject) => {ffmpeg.ffprobe(videoPath, (err, metadata) => {if (err) {reject(err);} else {resolve(parseFloat(metadata.format.duration));}});});});// 等待所有视频长度计算完成Promise.all(videoLengths).then(lengths => {// 构建 concat.txt 文件内容let concatFileContent = '';// 定义一个函数来随机选择视频片段function getRandomSegment(videoPath, length) {const segmentLength = 2; // 每个片段的长度为2秒const startTime = Math.floor(Math.random() * (length - segmentLength));return {videoPath,startTime,endTime: startTime + segmentLength};}// 随机选择视频片段const segments = [];for (let i = 0; i < lengths.length; i++) {const videoPath = videoPaths[i];const length = lengths[i];const segment = getRandomSegment(videoPath, length);segments.push(segment);}// 打乱视频片段的顺序function shuffleArray(array) {for (let i = array.length - 1; i > 0; i--) {const j = Math.floor(Math.random() * (i + 1));[array[i], array[j]] = [array[j], array[i]];}return array;}shuffleArray(segments);// 构建 concat.txt 文件内容segments.forEach(segment => {concatFileContent += `file '${segment.videoPath.replace(/\\/g, '/')}'\n`;concatFileContent += `inpoint ${segment.startTime}\n`;concatFileContent += `outpoint ${segment.endTime}\n`;});fs.writeFileSync(concatFilePath, concatFileContent, 'utf8');// 使用 ffmpeg 合并多个视频ffmpeg().input(concatFilePath).inputOptions(['-f concat','-safe 0']).output(outputPath).outputOptions(['-y', // 覆盖已存在的输出文件'-c:v libx264', // 视频编码器'-preset veryfast', // 编码速度'-crf 23', // 视频质量控制'-map 0:v', // 选择所有输入文件的视频流'-an' // 禁用音频]).on('end', () => {const processedVideoSrc = `/processed/merged_video.mp4`;console.log(`Processed video saved at: ${outputPath}`);res.json({ message: 'Videos processed and merged successfully.', path: processedVideoSrc });}).on('error', (err) => {console.error(`Error processing videos: ${err}`);console.error('FFmpeg stderr:', err.stderr);res.status(500).json({ error: 'An error occurred while processing the videos.' });}).run();}).catch(err => {console.error(`Error calculating video lengths: ${err}`);res.status(500).json({ error: 'An error occurred while processing the videos.' });});// 写入 concat.txt 文件const concatFileContent = videoPaths.map(p => `file '${p.replace(/\\/g, '/')}'`).join('\n');fs.writeFileSync(concatFilePath, concatFileContent, 'utf8');
});module.exports = router;
注意：
关于multer配置项 和 ffmpeg() 的说明可移步进行查看FFmpeg的简单使用【Windows】--- 视频倒叙播放-CSDN博客
routers =》index.js
var express = require('express');
var router = express.Router();router.use('/user', require('./users'));module.exports = router;
app.js
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');var indexRouter = require('./routes/index');var app = express();// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));// 使用cors解决跨域问题
app.use(require('cors')());app.use('/', indexRouter);// catch 404 and forward to error handler
app.use(function (req, res, next) {next(createError(404));
});// error handler
app.use(function (err, req, res, next) {// set locals, only providing error in developmentres.locals.message = err.message;res.locals.error = req.app.get('env') === 'development' ? err : {};// render the error pageres.status(err.status || 500);res.render('error');
});module.exports = app;
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