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<!DOCTYPE html>
<html lang="de">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Sport Video App</title>
<link rel="manifest" href="/manifest.json" />
<!-- Optional: CSS-Datei einbinden -->
<link rel="stylesheet" href="/css/styles.css" />
</head>
<body>
<div id="root"></div>
<script>
if ('serviceWorker' in navigator) {
window.addEventListener('load', () => {
navigator.serviceWorker.register('/service-worker.js')
.then(registration => {
console.log('Service Worker registriert mit Scope:', registration.scope);
})
.catch(error => {
console.error('Service Worker Registrierung fehlgeschlagen:', error);
});
});
}
</script>
</body>
</html>
{
"short_name": "SportVideo",
"name": "Sport Video App",
"start_url": "/index.html",
"display": "standalone",
"background_color": "#ffffff",
"theme_color": "#000000",
"icons": [
{
"src": "/icons/icon-192x192.png",
"type": "image/png",
"sizes": "192x192"
},
{
"src": "/icons/icon-512x512.png",
"type": "image/png",
"sizes": "512x512"
}
]
}
const CACHE_NAME = 'sport-video-app-cache-v1';
const urlsToCache = [
'/',
'/index.html',
'/css/styles.css',
'/js/main.js',
'/icons/icon-192x192.png',
'/icons/icon-512x512.png'
];
self.addEventListener('install', event => {
event.waitUntil(
caches.open(CACHE_NAME).then(cache => cache.addAll(urlsToCache))
);
});
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(response => response || fetch(event.request))
);
});
// src/context/FFmpegContext.jsx
import React, { createContext, useContext, useState, useEffect } from 'react';
import { createFFmpeg } from '@ffmpeg/ffmpeg';
const FFmpegContext = createContext();
export const useFFmpeg = () => useContext(FFmpegContext);
export const FFmpegProvider = ({ children }) => {
const [ffmpeg] = useState(() => createFFmpeg({ log: true }));
const [isLoaded, setIsLoaded] = useState(false);
const [error, setError] = useState(null);
useEffect(() => {
const loadFFmpeg = async () => {
try {
await ffmpeg.load();
setIsLoaded(true);
} catch (err) {
setError(err);
}
};
loadFFmpeg();
}, [ffmpeg]);
return (
<FFmpegContext.Provider value={{ ffmpeg, isLoaded, error }}>
{children}
</FFmpegContext.Provider>
);
};
// src/context/VideoContext.jsx
import React, { createContext, useContext, useState } from 'react';
const VideoContext = createContext();
export const useVideo = () => useContext(VideoContext);
export const VideoProvider = ({ children }) => {
const [videos, setVideos] = useState([]);
const addVideo = (video) => {
setVideos(prevVideos => [...prevVideos, video]);
};
return (
<VideoContext.Provider value={{ videos, addVideo }}>
{children}
</VideoContext.Provider>
);
};
// src/components/VideoEditor.jsx
import React, { useState, useRef } from 'react';
import { useFFmpeg } from '../context/FFmpegContext';
import { useVideo } from '../context/VideoContext';
import { toast } from 'react-toastify';
import { CircularProgress } from '@mui/material';
const VideoEditor = () => {
const { ffmpeg, isLoaded, error } = useFFmpeg();
const { addVideo } = useVideo();
const [videoFile, setVideoFile] = useState(null);
const [processing, setProcessing] = useState(false);
const [progress, setProgress] = useState(0);
const videoRef = useRef();
const handleFileUpload = async (e) => {
const file = e.target.files[0];
if (!file) return;
if (!file.type.startsWith('video/')) {
toast.error('Nur Videoformate erlaubt (MP4, WebM, MOV)');
return;
}
if (file.size > process.env.REACT_APP_MAX_FILE_SIZE) {
toast.error('Maximale Dateigröße: 100MB');
return;
}
try {
setVideoFile(URL.createObjectURL(file));
} catch (err) {
toast.error('Fehler beim Verarbeiten der Datei');
}
};
const trimVideo = async () => {
if (!videoFile) {
toast.error('Kein Video ausgewählt');
return;
}
setProcessing(true);
try {
const inputName = 'input.mp4';
const outputName = 'output.mp4';
const response = await fetch(videoFile);
const buffer = await response.arrayBuffer();
ffmpeg.FS('writeFile', inputName, new Uint8Array(buffer));
ffmpeg.setProgress(({ ratio }) => setProgress(ratio));
// Trimme ab 2 Sekunden, Dauer 5 Sekunden
await ffmpeg.run('-i', inputName, '-ss', '00:00:02', '-t', '5', outputName);
const data = ffmpeg.FS('readFile', outputName);
const trimmedVideoURL = URL.createObjectURL(
new Blob([data.buffer], { type: 'video/mp4' })
);
addVideo(trimmedVideoURL);
toast.success('Video erfolgreich getrimmt');
} catch (err) {
console.error(err);
toast.error('Fehler beim Trimmen des Videos');
} finally {
setProcessing(false);
}
};
return (
<div>
<h2>Sport Video Editor</h2>
<input type="file" accept="video/*" onChange={handleFileUpload} />
{videoFile && <video ref={videoRef} src={videoFile} controls width="400" />}
{processing && <CircularProgress variant="determinate" value={progress * 100} />}
<button disabled={!isLoaded || processing} onClick={trimVideo}>
Video trimmen
</button>
{error && <p>FFmpeg Error: {error.message}</p>}
</div>
);
};
export default VideoEditor;
cd sport-video-app
npx create-react-app sport-video-app
node -v
npm -v
npm install
npm start
// public/service-worker.js
const CACHE_NAME = 'sport-video-app-cache-v1';
const urlsToCache = [
'/',
'/index.html',
'/css/styles.css', // falls du CSS nutzt
'/js/main.js', // falls weitere statische JS-Dateien vorhanden sind
'/icons/icon-192x192.png',
'/icons/icon-512x512.png'
];
self.addEventListener('install', event => {
event.waitUntil(
caches.open(CACHE_NAME).then(cache => cache.addAll(urlsToCache))
);
});
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(response => response || fetch(event.request))
);
});
VideoEditor.jsxsport-video-app/
├── public/
│ ├── index.html
│ ├── manifest.json
│ ├── service-worker.js
│ └── icons/
│ ├── icon-192x192.png
│ └── icon-512x512.png
├── src/
│ ├── components/
│ │ └── VideoEditor.jsx
│ ├── context/
│ │ ├── FFmpegContext.jsx
│ │ └── VideoContext.jsx
│ ├── App.jsx
│ └── index.js
├── .env
├── package.json
└── README.md
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