BolkeDerBaer
038910e9f0
- Implemented a service worker (sw.js) to handle push notifications with dynamic options and notification click events. - Created a calendar layout in test.html with a grid system for displaying events across days and times. - Developed a visually engaging WLAN QR code page (wlan.html) with animated backgrounds, particle effects, and tips for connecting to the network.
199 lines
6.2 KiB
HTML
199 lines
6.2 KiB
HTML
<!doctype html>
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<html lang="de">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width,initial-scale=1" />
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<title>Video Frame-Stepping mit FPS-Erkennung</title>
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<style>
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body {
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font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial;
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padding: 18px;
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max-width: 900px;
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margin: auto;
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}
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.controls {
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display: flex;
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gap: 8px;
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flex-wrap: wrap;
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align-items: center;
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margin-bottom: 12px;
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}
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video {
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max-width: 100%;
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display: block;
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margin-bottom: 12px;
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background: #000;
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}
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canvas {
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border: 1px solid #ddd;
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max-width: 100%;
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display: block;
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}
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label {
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font-size: 0.9rem;
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}
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input[type="number"] {
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width: 80px;
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}
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button {
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padding: 6px 10px;
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}
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.info {
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margin-top: 10px;
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color: #444;
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font-size: 0.9rem;
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}
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</style>
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</head>
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<body>
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<h1>Video: Frame für Frame mit FPS-Erkennung</h1>
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<div class="controls">
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<label>Wähle Datei:
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<input id="file" type="file" accept="video/*">
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</label>
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<label>fps:
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<input id="fps" type="number" step="0.01" value="25" min="1">
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</label>
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<button id="prev">◀️ Prev Frame</button>
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<button id="next">Next Frame ▶️</button>
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<button id="play">Play ▶</button>
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<button id="pause">Pause ⏸</button>
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<button id="export">Export Current Frame (PNG)</button>
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</div>
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<video id="video" controls crossorigin="anonymous" style="display:none"></video>
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<canvas id="canvas"></canvas>
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<div class="info" id="info">
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Lade ein Video, warte auf Metadaten...
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</div>
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<script>
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const fileInput = document.getElementById('file');
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const video = document.getElementById('video');
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const canvas = document.getElementById('canvas');
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const ctx = canvas.getContext('2d');
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const fpsInput = document.getElementById('fps');
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const prevBtn = document.getElementById('prev');
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const nextBtn = document.getElementById('next');
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const playBtn = document.getElementById('play');
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const pauseBtn = document.getElementById('pause');
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const exportBtn = document.getElementById('export');
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const info = document.getElementById('info');
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let fileURL = null;
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let rafId = null;
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// --- Datei laden ---
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fileInput.addEventListener('change', () => {
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const file = fileInput.files && fileInput.files[0];
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if (!file) return;
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if (fileURL) URL.revokeObjectURL(fileURL);
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fileURL = URL.createObjectURL(file);
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video.src = fileURL;
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video.style.display = 'block';
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video.load();
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info.textContent = 'Video geladen. Warte auf Metadaten...';
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});
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// --- Metadaten geladen ---
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video.addEventListener('loadedmetadata', () => {
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canvas.width = video.videoWidth || 640;
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canvas.height = video.videoHeight || 360;
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seekAndDraw(0).catch(() => { });
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info.textContent = `Dauer: ${formatSeconds(video.duration)} — Bildgröße: ${canvas.width}×${canvas.height}`;
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detectFPS();
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});
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// --- Hilfsfunktionen ---
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function formatSeconds(s) {
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if (!isFinite(s)) return '–';
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const mm = Math.floor(s / 60);
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const ss = (s % 60).toFixed(2).padStart(5, '0');
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return `${mm}:${ss}`;
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}
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function drawCurrentFrame() {
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try {
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ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
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} catch (e) {
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console.warn('drawImage fehlgeschlagen:', e);
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}
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}
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function seek(videoEl, time) {
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return new Promise((resolve, reject) => {
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function cleanup() {
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videoEl.removeEventListener('seeked', onSeeked);
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videoEl.removeEventListener('error', onError);
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}
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function onSeeked() { cleanup(); resolve(); }
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function onError(e) { cleanup(); reject(e); }
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videoEl.addEventListener('seeked', onSeeked);
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videoEl.addEventListener('error', onError);
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videoEl.currentTime = Math.min(Math.max(time, 0), videoEl.duration || time);
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});
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}
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async function seekAndDraw(time) {
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await seek(video, time);
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drawCurrentFrame();
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}
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// --- Buttons ---
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nextBtn.addEventListener('click', async () => {
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const fps = parseFloat(fpsInput.value) || 25;
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const frameDur = 1 / fps;
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const target = (video.currentTime || 0) + frameDur;
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await seekAndDraw(Math.min(target + 0.00001, video.duration || target));
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});
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prevBtn.addEventListener('click', async () => {
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const fps = parseFloat(fpsInput.value) || 25;
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const frameDur = 1 / fps;
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const target = (video.currentTime || 0) - frameDur;
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await seekAndDraw(Math.max(target, 0));
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});
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exportBtn.addEventListener('click', () => {
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drawCurrentFrame();
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canvas.toBlob(blob => {
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if (!blob) return;
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const a = document.createElement('a');
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const url = URL.createObjectURL(blob);
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a.href = url;
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a.download = 'frame.png';
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document.body.appendChild(a);
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a.click();
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a.remove();
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setTimeout(() => URL.revokeObjectURL(url), 2000);
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}, 'image/png');
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});
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// --- Seeked Event ---
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video.addEventListener('seeked', () => { drawCurrentFrame(); });
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// --- Safety Initial Draw ---
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window.addEventListener('load', () => {
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ctx.fillStyle = '#000';
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ctx.fillRect(0, 0, canvas.width || 640, canvas.height || 360);
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});
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</script>
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</body>
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</html> |