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YouTube用低視聴回数・古い動画・ライブ動画の非表示

YouTubeでおすすめに表示される再生回数の少ない動画・投稿日の古い動画・ライブ視聴者数が少ない動画を非表示にします。再生回数・視聴者数のしきい値はコード内で変更可能。古い動画の非表示は1年前の動画から設定可能。チャンネル内の動画は無視するオプション付き。

当前为 2025-07-01 提交的版本，查看 最新版本。

// ==UserScript==
// @name         YouTube用低視聴回数・古い動画・ライブ動画の非表示
// @namespace    http://tampermonkey.net/
// @description  YouTubeでおすすめに表示される再生回数の少ない動画・投稿日の古い動画・ライブ視聴者数が少ない動画を非表示にします。再生回数・視聴者数のしきい値はコード内で変更可能。古い動画の非表示は1年前の動画から設定可能。チャンネル内の動画は無視するオプション付き。
// @author       sun
// @match        *://*.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant        GM_registerMenuCommand
// @version      2.1
// ==/UserScript==

const VIEW_THRESHOLD = 1000; // 再生回数のしきい値
const AGE_THRESHOLD_YEARS = 0; // 年以上前の動画を非表示（0=無効）
const LIVE_FILTER_ENABLED = 0; // ライブ視聴者数で非表示判定（0=無効,1=有効）
const LIVE_VIEWER_THRESHOLD = 100; // ライブ視聴者数のしきい値
const DISABLE_ON_SUBSCRIPTIONS = true; // チャンネル内の動画は無視するか

const OPTION_STORAGE_KEY = 'YT_LowViewFilter_Settings';
const VIDEO_SELECTORS = "ytd-rich-item-renderer, ytd-compact-video-renderer, .yt-lockup-view-model-wiz";

const VIEW_COUNT_SELECTOR = [
    ".inline-metadata-item.style-scope.ytd-video-meta-block",
    "span.yt-core-attributed-string.yt-content-metadata-view-model-wiz__metadata-text"
];

const LIVE_VIEWER_SELECTORS = [
    ".yt-content-metadata-view-model-wiz__metadata-text",
    "span.yt-core-attributed-string"
];

let menuRegistered = false;

function parseViewCount(text) {
    if (!text) return 0;
    const multipliers = { "K": 1e3, "M": 1e6, "万": 1e4, "億": 1e8 };
    let numText = text.replace(/[^0-9\.KM万億]/g, "");
    let unit = Object.keys(multipliers).find(u => numText.includes(u)) || "";
    numText = numText.replace(unit, "");
    return numText ? parseFloat(numText) * (multipliers[unit] || 1) : 0;
}

function parseLiveViewerCount(text) {
    if (!text) return 0;
    const m = text.replace(/,/g, "").match(/([0-9]+)/);
    if (m) {
        return parseInt(m[1], 10);
    }
    return 0;
}

function isLiveVideo(videoElement) {
    if (!videoElement || LIVE_FILTER_ENABLED === 0) return false;
    for (const selector of LIVE_VIEWER_SELECTORS) {
        const elems = videoElement.querySelectorAll(selector);
        for (const elem of elems) {
            if (elem && /[0-9,]+ 人が視聴中/.test(elem.innerText)) {
                const count = parseLiveViewerCount(elem.innerText);
                if (count > 0 && count < LIVE_VIEWER_THRESHOLD) {
                    return true;
                }
                return false;
            }
        }
    }
    return false;
}

function isBadVideo(videoElement) {
    if (!videoElement) return false;

    if (isLiveVideo(videoElement)) return true;

    for (const selector of VIEW_COUNT_SELECTOR) {
        const elems = videoElement.querySelectorAll(selector);
        for (const elem of elems) {
            if (elem && elem.innerText.includes('回視聴')) {
                const viewCount = parseViewCount(elem.innerText);
                if (viewCount > 0 && viewCount < VIEW_THRESHOLD) {
                    return true;
                }
            }
        }
    }
    return false;
}

function isOldVideo(videoElement) {
    if (AGE_THRESHOLD_YEARS === 0) return false;

    const dateTexts = [];
    const dateSelectors = [
        ".inline-metadata-item.style-scope.ytd-video-meta-block",
        "span.yt-core-attributed-string.yt-content-metadata-view-model-wiz__metadata-text"
    ];

    dateSelectors.forEach(sel => {
        videoElement.querySelectorAll(sel).forEach(elm => {
            const text = elm.innerText;
            if (text && /前$/.test(text)) {
                dateTexts.push(text);
            }
        });
    });

    for (const dateText of dateTexts) {
        if (/([0-9]+)\s*年前/.test(dateText)) {
            const years = parseInt(RegExp.$1, 10);
            if (years >= AGE_THRESHOLD_YEARS) return true;
        }
        if (/([0-9]+)\s*ヶ月前/.test(dateText)) {
            const months = parseInt(RegExp.$1, 10);
            if (months >= AGE_THRESHOLD_YEARS * 12) return true;
        }
    }
    return false;
}

function isSubscriptionsPage() {
    return location.pathname.includes('/@') && location.pathname.includes('/videos');
}

function isLivePage() {
    return location.pathname.includes('/streams');
}

function getSettings() {
    return JSON.parse(localStorage.getItem(OPTION_STORAGE_KEY)) || { disableOnSubs: DISABLE_ON_SUBSCRIPTIONS };
}

function hideBadVideo(videoElement) {
    if (!videoElement || isLivePage()) return;
    const { disableOnSubs } = getSettings();
    if (disableOnSubs && isSubscriptionsPage()) return;

    if (isBadVideo(videoElement) || isOldVideo(videoElement)) {
        videoElement.style.display = "none";
    }
}

const observer = new IntersectionObserver(entries => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            hideBadVideo(entry.target);
            observer.unobserve(entry.target);
        }
    });
}, { rootMargin: "300px" });

function update() {
    if (isLivePage()) return;
    document.querySelectorAll(VIDEO_SELECTORS).forEach(video => {
        hideBadVideo(video);
        observer.observe(video);
    });
}

function initTampermonkeyMenu() {
    if (menuRegistered) return;
    menuRegistered = true;
    const { disableOnSubs } = getSettings();

    GM_registerMenuCommand(
        `チャンネル内の動画は無視する: ${disableOnSubs ? "ON" : "OFF"}`,
        () => {
            localStorage.setItem(OPTION_STORAGE_KEY, JSON.stringify({ disableOnSubs: !disableOnSubs }));
            window.location.reload();
        }
    );

    GM_registerMenuCommand(
        `ライブ視聴者数で非表示判定: ${LIVE_FILTER_ENABLED ? "ON" : "OFF"}`,
        () => {
            const newValue = LIVE_FILTER_ENABLED ? 0 : 1;
            localStorage.setItem('YT_LiveFilter_Enabled', newValue);
            alert('ライブ視聴者数フィルター設定を変更しました。ページを再読み込みします。');
            window.location.reload();
        }
    );
}

(function(){
    const liveFilterStorage = localStorage.getItem('YT_LiveFilter_Enabled');
    if (liveFilterStorage !== null) {
        window.LIVE_FILTER_ENABLED = parseInt(liveFilterStorage, 10);
    } else {
        window.LIVE_FILTER_ENABLED = LIVE_FILTER_ENABLED;
    }
})();

window.addEventListener("load", () => {
    initTampermonkeyMenu();
    update();

    ["yt-navigate-finish", "yt-page-data-updated", "yt-action"].forEach(event => {
        window.addEventListener(event, () => setTimeout(update, 500));
    });

    const mutationObserver = new MutationObserver(mutations => {
        if (isLivePage()) return;
        mutations.forEach(mutation => {
            mutation.addedNodes.forEach(node => {
                if (node.nodeType !== 1) return;
                if (node.matches?.(VIDEO_SELECTORS)) {
                    hideBadVideo(node);
                    observer.observe(node);
                } else if (node.querySelectorAll) {
                    node.querySelectorAll(VIDEO_SELECTORS).forEach(video => {
                        hideBadVideo(video);
                        observer.observe(video);
                    });
                }
            });
        });
    });
    mutationObserver.observe(document.body, { childList: true, subtree: true });
});

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