Ultimate Video & Image Quality Enhancer (No Lag, Best Previews)

Forces the highest quality playback for videos and images on all sites. Enhances thumbnails and video previews instantly without lag, pausing, or freezing.

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Wrap lines

// ==UserScript==
// @name         Ultimate Video & Image Quality Enhancer (No Lag, Best Previews)
// @namespace    https://gf.qytechs.cn/shannonturner
// @version      1.3
// @description  Forces the highest quality playback for videos and images on all sites. Enhances thumbnails and video previews instantly without lag, pausing, or freezing.
// @author       tae
// @match        *://*/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

(function () {
    'use strict';

    console.log("✅ Ultimate Video & Image Quality Enhancer is now active!");

    function enhanceMedia() {
        document.querySelectorAll('img:not([data-enhanced])').forEach(img => {
            if (!img.closest('iframe') && !img.closest('[class*="ad"], [id*="ad"]')) {
                enhanceImage(img);
            }
        });

        document.querySelectorAll('video:not([data-enhanced])').forEach(video => {
            enhanceVideo(video);
        });
    }

    function enhanceImage(img) {
        if (!img.src || img.hasAttribute('data-enhanced')) return;

        try {
            // Ensure full-resolution thumbnails
            if (img.src.includes("=s") || img.src.includes("w=") || img.src.includes("h=")) {
                img.src = img.src.replace(/=s\d+/g, '=s4096').replace(/w=\d+/g, 'w=4096').replace(/h=\d+/g, 'h=4096');
            }
            img.style.imageRendering = 'crisp-edges'; // Prioritizes high clarity
            img.style.filter = "none"; // Removes blurriness
            img.setAttribute('data-enhanced', 'true');
        } catch (e) {
            console.error('❌ Failed to enhance image:', e);
        }
    }

    function enhanceVideo(video) {
        if (video.hasAttribute('data-enhanced')) return;

        video.setAttribute('data-enhanced', 'true');
        video.preload = 'auto';
        video.playsInline = true;
        video.autobuffer = true;
        video.style.filter = "none"; // Removes any compression blur

        // Force highest available video quality
        let qualityLevels = video.getAvailableQualityLevels?.();
        if (qualityLevels && qualityLevels.length > 0) {
            let highestQuality = qualityLevels[0];
            video.setPlaybackQuality?.(highestQuality);
        }

        video.load();
    }

    // Observe the page for dynamically loaded media
    const observer = new MutationObserver(() => {
        requestAnimationFrame(() => enhanceMedia());
    });

    observer.observe(document.body, { childList: true, subtree: true });

    setInterval(() => enhanceMedia(), 5000);

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', enhanceMedia);
    } else {
        enhanceMedia();
    }
})();

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