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body {
  background: black;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
}
.tv-screen {
  position: absolute;
  width: 90vw;
  height: 50vw;
  max-width: 100%;
  max-height: 100vh;
  background-image: url(https://alexandrevacassin.fr/codepen/old-tv/base.webp);
  z-index: 10;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
}
.tv-container {
  position: absolute;
  margin-bottom: 3vw;
  width: 60vw;
  margin-right: 10vw;
  height: 45vw;
  max-width: 100%;
  max-height: 70vh;
  z-index: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden
}
video, iframe {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  filter: contrast(1.2) brightness(1.1);
}
.glitch {
  pointer-events: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("https://upload.wikimedia.org/wikipedia/commons/0/02/Television_static.gif");
  mix-blend-mode: multiply;
  opacity: 0.3;
  animation: glitchMove 0.2s infinite linear;
  z-index: 2;
}
.scan-lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0) 0px,
    rgba(0, 0, 0, 0.2) 1px,
    rgba(0, 0, 0, 0) 2px
  );
  pointer-events: none;
  z-index: 2;
}
@keyframes glitchMove {
  0% { transform: translateX(0); }
  33% { transform: translateX(-5px); }
  66% { transform: translateX(5px); }
  100% { transform: translateX(0); }
}
canvas {
  mix-blend-mode: screen;
  position: absolute;
  left: 0;
  z-index: 9;
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
}

.snow-effect {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("https://upload.wikimedia.org/wikipedia/commons/0/02/Television_static.gif");
  background-size: cover;
  opacity: 0;
  z-index: 3;
  pointer-events: none;
  transition: opacity 0.5s ease-in-out;
}

JS

function getRandomInt(min, max) {
    min = Math.ceil(min);
    max = Math.floor(max);
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

class VCREffect {
    constructor(canvas, options = {}) {
        this.canvas = canvas;
        this.ctx = canvas.getContext("2d");
        this.config = Object.assign({
            fps: 60,
            blur: 1,
            opacity: 1,
            miny: 220,
            miny2: 220,
            num: 70
        }, options);

this.init();
    }

init() {
        this.canvas.width = window.innerWidth;
        this.canvas.height = window.innerHeight;
        this.canvas.style.position = "absolute";
        this.canvas.style.top = "0";
        this.canvas.style.left = "0";
        this.canvas.style.opacity = this.config.opacity;

this.generateVCRNoise();
        window.addEventListener("resize", () => this.onResize());
    }

onResize() {
        this.canvas.width = window.innerWidth;
        this.canvas.height = window.innerHeight;
    }

generateVCRNoise() {
        if (this.config.fps >= 60) {
            cancelAnimationFrame(this.vcrInterval);
            const animate = () => {
                this.renderTrackingNoise();
                this.vcrInterval = requestAnimationFrame(animate);
            };
            animate();
        } else {
            clearInterval(this.vcrInterval);
            this.vcrInterval = setInterval(() => {
                this.renderTrackingNoise();
            }, 1000 / this.config.fps);
        }
    }

renderTrackingNoise(radius = 2) {
        const { canvas, ctx, config } = this;
        let { miny, miny2, num } = config;

canvas.style.filter = `blur(${config.blur}px)`;
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        ctx.fillStyle = `#fff`;

ctx.beginPath();
        for (let i = 0; i <= num; i++) {
            let x = Math.random() * canvas.width;
            let y1 = getRandomInt(miny += 3, canvas.height);
            let y2 = getRandomInt(0, miny2 -= 3);
            ctx.fillRect(x, y1, radius, radius);
            ctx.fillRect(x, y2, radius, radius);
            ctx.fill();

this.renderTail(ctx, x, y1, radius);
            this.renderTail(ctx, x, y2, radius);
        }
        ctx.closePath();
    }

renderTail(ctx, x, y, radius) {
        const n = getRandomInt(1, 50);
        const dirs = [1, -1];
        let dir = dirs[Math.floor(Math.random() * dirs.length)];

for (let i = 0; i < n; i++) {
            let r = getRandomInt(radius - 0.01, radius);
            let dx = getRandomInt(1, 4) * dir;
            radius -= 0.1;
            ctx.fillRect((x += dx), y, r, r);
            ctx.fill();
        }
    }
}

// Usage
const canvas = document.getElementById("canvas");
const vcrEffect = new VCREffect(canvas, {
    opacity: 1,
    miny: 220,
    miny2: 220,
    num: 70,
    fps: 60,
    blur: 1
});
const videoIds = ["c4CVKbVtTsc", "143aXLat70E", "J5SSsT1O9gE", "dAiomIGB3qo", "lk6iJNSv-vY", "7PgJLyeb6sM", "wz0A7m1euy0"];
let currentVideoIndex = 0;
const iframe = document.getElementById("ytplayer");
const snowEffect = document.querySelector(".snow-effect");

iframe.addEventListener("load", () => {
  setTimeout(switchToNextVideo, 20000); 
});

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