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<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Discord用 動画カット＆圧縮ツール</title>
<meta name="description" content="Discord無料プランの10MB制限に対応。ブラウザ上で動画をカット・圧縮してWebM形式で出力。サーバーアップロード不要、完全ローカル処理。" />
<meta name="author" content="wory-bonbon" />
<!-- OGP -->
<meta property="og:title" content="Discord用 動画カット＆圧縮ツール" />
<meta property="og:description" content="10MB制限対応。ブラウザ上で動画をカット・圧縮。完全ローカル処理。" />
<meta property="og:type" content="website" />
<meta property="og:url" content="https://wory-bonbon.github.io/discord-video-compressor/" />
<meta name="twitter:card" content="summary" />
<style>
* {
box-sizing: border-box;
}
body {
font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
margin: 0;
padding: 24px 32px;
background: #fafafa;
color: #1f2937;
min-height: 100vh;
}
/* ===== 画面全体でドロップ受付 ===== */
body.dragover::after {
content: 'ここにドロップ';
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
display: flex;
align-items: center;
justify-content: center;
background: rgba(168, 139, 250, 0.15);
font-size: 24px;
font-weight: 600;
color: #7c3aed;
pointer-events: none;
z-index: 1000;
border: 3px dashed #a78bfa;
}
/* ===== ヘッダー ===== */
header {
margin-bottom: 20px;
}
header h1 {
font-size: 22px;
font-weight: 700;
margin: 0 0 8px 0;
color: #111827;
}
header p {
font-size: 14px;
color: #6b7280;
margin: 0;
}
header .drop-hint {
color: #7c3aed;
font-weight: 500;
}
header a {
color: #7c3aed;
text-decoration: none;
font-weight: 500;
}
header a:hover {
text-decoration: underline;
}
/* ===== 動画セクション（左右レイアウト） ===== */
.video-container {
display: flex;
gap: 20px;
}
@media (max-width: 900px) {
.video-container {
flex-direction: column;
}
}
.video-panel {
flex: 1;
min-width: 0;
display: flex;
flex-direction: column;
}
.video-panel-label {
font-size: 13px;
font-weight: 600;
margin-bottom: 10px;
padding: 8px 14px;
border-radius: 8px;
display: inline-flex;
align-items: center;
gap: 6px;
}
.video-panel.original .video-panel-label,
.video-panel.preview .video-panel-label {
background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);
color: #4338ca;
}
/* ===== チェッカーパターン背景 ===== */
.video-wrapper {
position: relative;
border-radius: 12px;
overflow: hidden;
flex: 1;
display: flex;
flex-direction: column;
/* チェッカーパターン */
background-color: #ffffff;
background-image:
linear-gradient(45deg, rgba(0,0,0,0.04) 25%, transparent 25%, transparent 75%, rgba(0,0,0,0.04) 75%),
linear-gradient(45deg, rgba(0,0,0,0.04) 25%, transparent 25%, transparent 75%, rgba(0,0,0,0.04) 75%);
background-size: 16px 16px;
background-position: 0 0, 8px 8px;
/* 境界線 */
border: 1px solid rgba(0,0,0,0.08);
box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.video-wrapper video {
width: 100%;
height: 100%;
min-height: 300px;
max-height: 58vh;
object-fit: contain;
display: block;
}
/* ===== タイムラインマーカー ===== */
.timeline-section {
margin-top: 12px;
}
.timeline-container {
position: relative;
height: 32px;
background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
border-radius: 8px;
cursor: pointer;
border: 1px solid rgba(0,0,0,0.06);
}
.timeline-progress {
height: 100%;
background: linear-gradient(135deg, #c4b5fd 0%, #a78bfa 100%);
border-radius: 8px;
width: 0%;
opacity: 0.5;
}
.timeline-marker {
position: absolute;
top: -2px;
transform: translateX(-50%);
font-size: 18px;
line-height: 1;
cursor: ew-resize;
user-select: none;
filter: drop-shadow(0 1px 2px rgba(0,0,0,0.15));
}
.timeline-marker.start {
color: #7c3aed;
}
.timeline-marker.end {
color: #ec4899;
}
.timeline-marker-label {
position: absolute;
top: 100%;
left: 50%;
transform: translateX(-50%);
font-size: 10px;
font-weight: 600;
white-space: nowrap;
margin-top: 4px;
background: #fff;
padding: 2px 6px;
border-radius: 4px;
color: #6b7280;
box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.timeline-time {
display: flex;
justify-content: space-between;
font-size: 11px;
color: #9ca3af;
margin-top: 6px;
font-weight: 500;
}
/* ===== コントロール ===== */
.controls {
margin-top: 20px;
display: flex;
flex-wrap: wrap;
gap: 16px;
align-items: flex-start;
padding: 16px 20px;
background: #fff;
border-radius: 12px;
border: 1px solid rgba(0,0,0,0.06);
box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.control-item {
display: flex;
flex-direction: column;
}
.control-item label {
font-size: 11px;
font-weight: 600;
color: #6b7280;
margin-bottom: 6px;
text-transform: uppercase;
letter-spacing: 0.5px;
}
.control-item input[type="text"],
.control-item select {
padding: 10px 12px;
background: #f9fafb;
color: #1f2937;
border: 1px solid #e5e7eb;
border-radius: 8px;
min-width: 100px;
height: 42px;
font-size: 14px;
font-weight: 500;
transition: border-color 0.15s, box-shadow 0.15s;
}
.control-item input[type="text"]:focus,
.control-item select:focus {
outline: none;
border-color: #a78bfa;
box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.15);
}
.control-hint {
font-size: 10px;
color: #9ca3af;
margin-top: 4px;
min-height: 14px;
}
.control-item button {
height: 42px;
padding: 0 24px;
background: linear-gradient(135deg, #a78bfa 0%, #7c3aed 100%);
border: none;
border-radius: 8px;
color: #fff;
cursor: pointer;
font-size: 14px;
font-weight: 600;
transition: transform 0.1s, box-shadow 0.15s;
box-shadow: 0 2px 8px rgba(124, 58, 237, 0.25);
}
.control-item button:hover {
transform: translateY(-1px);
box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}
.control-item button:active {
transform: translateY(0);
}
.control-item button:disabled {
opacity: 0.5;
cursor: not-allowed;
transform: none;
}
/* ===== 音声削除トグル ===== */
.toggle-item {
display: flex;
flex-direction: column;
justify-content: flex-start;
}
.toggle-item label {
font-size: 11px;
font-weight: 600;
color: #6b7280;
margin-bottom: 6px;
text-transform: uppercase;
letter-spacing: 0.5px;
}
.toggle-switch {
position: relative;
width: 52px;
height: 42px;
display: flex;
align-items: center;
}
.toggle-switch input {
opacity: 0;
width: 0;
height: 0;
}
.toggle-slider {
position: absolute;
cursor: pointer;
top: 50%;
transform: translateY(-50%);
left: 0;
width: 48px;
height: 26px;
background-color: #e5e7eb;
border-radius: 26px;
transition: 0.2s;
}
.toggle-slider:before {
position: absolute;
content: "";
height: 20px;
width: 20px;
left: 3px;
top: 3px;
background-color: white;
border-radius: 50%;
transition: 0.2s;
box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.toggle-switch input:checked + .toggle-slider {
background: linear-gradient(135deg, #f87171 0%, #ef4444 100%);
}
.toggle-switch input:checked + .toggle-slider:before {
transform: translateX(22px);
}
.toggle-label-text {
font-size: 10px;
color: #9ca3af;
margin-top: 4px;
min-height: 14px;
white-space: nowrap;
}
.toggle-switch input:checked ~ .toggle-label-text {
color: #ef4444;
}
/* ===== ステータス／情報 ===== */
.status-bar {
margin-top: 16px;
padding: 14px 18px;
background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
border-radius: 10px;
font-size: 13px;
color: #4b5563;
text-align: center;
border: 1px solid rgba(0,0,0,0.04);
}
.status-bar.error {
background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
color: #b91c1c;
border-color: rgba(185, 28, 28, 0.1);
}
.size-info {
margin-top: 10px;
font-size: 13px;
color: #6b7280;
text-align: center;
font-weight: 500;
}
.re-preview-hint {
margin-top: 8px;
font-size: 12px;
color: #f59e0b;
text-align: center;
font-weight: 500;
}
.download-link {
display: none;
margin: 16px auto 0;
padding: 14px 32px;
background: linear-gradient(135deg, #34d399 0%, #10b981 100%);
color: #fff;
text-decoration: none;
border-radius: 10px;
font-weight: 600;
font-size: 15px;
text-align: center;
box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
transition: transform 0.1s, box-shadow 0.15s;
}
.download-link:hover {
transform: translateY(-1px);
box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}
/* ===== 情報カード ===== */
.info-cards {
margin-top: 24px;
display: grid;
grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
gap: 16px;
}
.info-card {
background: #fff;
border-radius: 12px;
padding: 18px 20px;
border: 1px solid rgba(0,0,0,0.06);
box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.info-card h3 {
font-size: 13px;
font-weight: 700;
color: #374151;
margin: 0 0 12px 0;
display: flex;
align-items: center;
gap: 6px;
}
.info-card table {
width: 100%;
font-size: 12px;
border-collapse: collapse;
}
.info-card th,
.info-card td {
padding: 6px 8px;
text-align: left;
border-bottom: 1px solid #f3f4f6;
}
.info-card th {
color: #6b7280;
font-weight: 500;
}
.info-card td {
color: #374151;
}
.info-card ul {
margin: 0;
padding-left: 18px;
font-size: 12px;
color: #4b5563;
line-height: 1.7;
}
/* ===== フッター ===== */
footer {
margin-top: 32px;
padding-top: 16px;
border-top: 1px solid #e5e7eb;
font-size: 12px;
color: #9ca3af;
text-align: center;
}
footer a {
color: #7c3aed;
text-decoration: none;
}
footer a:hover {
text-decoration: underline;
}
</style>
</head>
<body>
<!-- ヘッダー -->
<header>
<h1>Discord用 動画カット＆圧縮ツール</h1>
<p>
<span class="drop-hint">画面全体にドラッグ＆ドロップ</span>、
または <a href="#" id="fileSelectLink">ファイルを選択</a>
<input type="file" id="fileInput" accept="video/*" hidden />
</p>
</header>
<!-- 動画セクション -->
<div class="video-container" id="videoContainer" hidden>
<!-- 元動画パネル -->
<div class="video-panel original">
<div class="video-panel-label">📹 元動画</div>
<div class="video-wrapper">
<video id="video" controls></video>
</div>
<!-- タイムラインマーカー -->
<div class="timeline-section">
<div class="timeline-container" id="timeline">
<div class="timeline-progress" id="timelineProgress"></div>
<div class="timeline-marker start" id="startMarker">▼
<span class="timeline-marker-label" id="startMarkerLabel">0:00</span>
</div>
<div class="timeline-marker end" id="endMarker">▼
<span class="timeline-marker-label" id="endMarkerLabel">0:00</span>
</div>
</div>
<div class="timeline-time">
<span>0:00</span>
<span id="durationDisplay">0:00</span>
</div>
</div>
</div>
<!-- プレビューパネル -->
<div class="video-panel preview">
<div class="video-panel-label">✨ プレビュー</div>
<div class="video-wrapper">
<video id="previewVideo" controls></video>
</div>
</div>
</div>
<!-- コントロール -->
<div class="controls" id="controls" hidden>
<div class="control-item">
<label>スタート (秒)</label>
<input type="text" id="startTime" value="0" />
<span class="control-hint">ホイールで±1秒</span>
</div>
<div class="control-item">
<label>エンド (秒)</label>
<input type="text" id="endTime" value="0" />
<span class="control-hint">ホイールで±1秒</span>
</div>
<div class="control-item">
<label>解像度</label>
<select id="resolution">
<option value="original">オリジナル</option>
<option value="1920">1920px</option>
<option value="1280" selected>1280px</option>
<option value="960">960px</option>
<option value="640">640px</option>
<option value="480">480px</option>
</select>
<span class="control-hint">スクロールで変更</span>
</div>
<div class="control-item">
<label>ビットレート</label>
<select id="bitrate">
<option value="8000">8,000 kbps</option>
<option value="6000">6,000 kbps</option>
<option value="4000" selected>4,000 kbps</option>
<option value="2500">2,500 kbps</option>
<option value="1500">1,500 kbps</option>
<option value="1000">1,000 kbps</option>
</select>
<span class="control-hint">スクロールで変更</span>
</div>
<div class="control-item">
<label>再生速度</label>
<select id="playbackSpeed">
<option value="0.5">0.5x</option>
<option value="0.75">0.75x</option>
<option value="1" selected>1x</option>
<option value="1.25">1.25x</option>
<option value="1.5">1.5x</option>
<option value="2">2x</option>
</select>
<span class="control-hint">タイムラプス風</span>
</div>
<div class="control-item toggle-item">
<label>音声</label>
<label class="toggle-switch">
<input type="checkbox" id="muteAudio" />
<span class="toggle-slider"></span>
</label>
<span class="toggle-label-text" id="muteLabel">🔊 音声あり</span>
</div>
<div class="control-item" style="margin-left: auto;">
<label> </label>
<button id="previewBtn" disabled>▶ プレビュー</button>
<span class="control-hint"></span>
</div>
</div>
<!-- ステータス -->
<div class="status-bar" id="statusBar">動画ファイルをドロップしてください。</div>
<div class="size-info" id="sizeInfo"></div>
<div class="re-preview-hint" id="rePreviewHint" hidden>💡 音声削除を反映するには再度プレビューしてください</div>
<a class="download-link" id="downloadLink" download="discord_clip.webm">⬇ ダウンロード</a>
<!-- 情報カード -->
<div class="info-cards" id="infoCards" hidden>
<div class="info-card">
<h3>📊 10MB制限の目安</h3>
<table>
<tr><th>長さ</th><th>解像度</th><th>ビットレート</th></tr>
<tr><td>8秒</td><td>1920px</td><td>6,000〜8,000 kbps</td></tr>
<tr><td>15秒</td><td>1280px</td><td>4,000〜5,000 kbps</td></tr>
<tr><td>30秒</td><td>960px</td><td>2,000〜2,500 kbps</td></tr>
<tr><td>45秒</td><td>640px</td><td>1,200〜1,600 kbps</td></tr>
</table>
</div>
<div class="info-card">
<h3>💡 使い方のヒント</h3>
<ul>
<li>タイムラインの🔽マーカーをドラッグして範囲指定</li>
<li>各入力欄でマウスホイールを回すと値を調整可能</li>
<li>プレビューで確認後、ダウンロードボタンで保存</li>
<li>音声削除でファイルサイズを更に削減可能</li>
</ul>
</div>
</div>
<!-- フッター -->
<footer>
出力形式: WebM (VP9/VP8 + Opus) ｜ 完全ローカル処理 ｜
<a href="https://github.com/wory-bonbon/discord-video-compressor" target="_blank">GitHub</a>
</footer>
<script>
const video = document.getElementById('video');
const previewVideo = document.getElementById('previewVideo');
const startTimeInput = document.getElementById('startTime');
const endTimeInput = document.getElementById('endTime');
const resolutionSelect = document.getElementById('resolution');
const bitrateSelect = document.getElementById('bitrate');
const playbackSpeedSelect = document.getElementById('playbackSpeed');
const muteAudioCheckbox = document.getElementById('muteAudio');
const muteLabel = document.getElementById('muteLabel');
const previewBtn = document.getElementById('previewBtn');
const statusBar = document.getElementById('statusBar');
const sizeInfoEl = document.getElementById('sizeInfo');
const downloadLink = document.getElementById('downloadLink');
const videoContainer = document.getElementById('videoContainer');
const controls = document.getElementById('controls');
const infoCardsEl = document.getElementById('infoCards');
const durationDisplay = document.getElementById('durationDisplay');
const fileInput = document.getElementById('fileInput');
const fileSelectLink = document.getElementById('fileSelectLink');
const timeline = document.getElementById('timeline');
const timelineProgress = document.getElementById('timelineProgress');
const startMarker = document.getElementById('startMarker');
const endMarker = document.getElementById('endMarker');
const startMarkerLabel = document.getElementById('startMarkerLabel');
const endMarkerLabel = document.getElementById('endMarkerLabel');
const rePreviewHint = document.getElementById('rePreviewHint');
let videoDuration = 0;
let recording = false;
let lastPreviewHadAudio = false;
// ========== 音声トグル ==========
muteAudioCheckbox.addEventListener('change', () => {
if (muteAudioCheckbox.checked) {
muteLabel.textContent = '🔇 音声削除';
muteLabel.style.color = '#ef4444';
// 音声ありでプレビュー済みなら再プレビューを促す
if (lastPreviewHadAudio) {
rePreviewHint.hidden = false;
}
} else {
muteLabel.textContent = '🔊 音声あり';
muteLabel.style.color = '#9ca3af';
rePreviewHint.hidden = true;
}
});
// ========== ユーティリティ ==========
function formatTime(sec) {
const m = Math.floor(sec / 60);
const s = Math.floor(sec % 60);
return `${m}:${s.toString().padStart(2, '0')}`;
}
function humanSize(bytes) {
if (bytes < 1024) return bytes + ' B';
if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
return (bytes / (1024 * 1024)).toFixed(2) + ' MB';
}
function setStatus(msg, isError = false) {
statusBar.textContent = msg;
statusBar.classList.toggle('error', isError);
}
function updateMarkers() {
const start = parseFloat(startTimeInput.value) || 0;
const end = parseFloat(endTimeInput.value) || videoDuration;
if (videoDuration <= 0) return;
const startPercent = (start / videoDuration) * 100;
const endPercent = (end / videoDuration) * 100;
startMarker.style.left = startPercent + '%';
endMarker.style.left = endPercent + '%';
startMarkerLabel.textContent = formatTime(start);
endMarkerLabel.textContent = formatTime(end);
}
function updateTimelineProgress() {
if (videoDuration <= 0) return;
const percent = (video.currentTime / videoDuration) * 100;
timelineProgress.style.width = percent + '%';
}
// ========== ホイール操作 ==========
function attachWheelToInput(el, min, maxFn, step) {
el.addEventListener('wheel', (e) => {
e.preventDefault();
let val = parseFloat(el.value) || 0;
const max = typeof maxFn === 'function' ? maxFn() : maxFn;
if (e.deltaY < 0) {
val = Math.min(max, val + step);
} else {
val = Math.max(min, val - step);
}
el.value = val.toFixed(1);
el.dispatchEvent(new Event('change'));
});
}
function attachScrollSelect(select) {
select.addEventListener('wheel', (e) => {
e.preventDefault();
let idx = select.selectedIndex;
if (e.deltaY < 0) {
if (idx > 0) idx--;
} else {
if (idx < select.options.length - 1) idx++;
}
select.selectedIndex = idx;
});
}
attachWheelToInput(startTimeInput, 0, () => videoDuration, 1);
attachWheelToInput(endTimeInput, 0, () => videoDuration, 1);
attachScrollSelect(resolutionSelect);
attachScrollSelect(bitrateSelect);
attachScrollSelect(playbackSpeedSelect);
startTimeInput.addEventListener('focus', () => startTimeInput.select());
endTimeInput.addEventListener('focus', () => endTimeInput.select());
// ========== ファイル読み込み ==========
async function handleFile(file) {
if (!file || !file.type.startsWith('video/')) {
setStatus('動画ファイルを選択してください。', true);
return;
}
const url = URL.createObjectURL(file);
video.src = url;
await video.play().catch(() => {});
video.pause();
video.currentTime = 0;
videoDuration = video.duration;
startTimeInput.value = '0';
endTimeInput.value = Math.floor(videoDuration).toString();
durationDisplay.textContent = formatTime(videoDuration);
videoContainer.hidden = false;
controls.hidden = false;
infoCardsEl.hidden = false;
previewBtn.disabled = false;
previewVideo.src = '';
updateMarkers();
setStatus('動画を読み込みました。範囲とパラメータを設定してください。');
sizeInfoEl.textContent = '';
downloadLink.style.display = 'none';
lastPreviewHadAudio = false;
rePreviewHint.hidden = true;
}
// ========== バリデーション ==========
function validateTimes() {
const startVal = parseFloat(startTimeInput.value);
const endValRaw = parseFloat(endTimeInput.value);
if (isNaN(startVal) || isNaN(endValRaw)) return;
if (endValRaw > videoDuration) {
endTimeInput.value = Math.floor(videoDuration).toString();
}
if (startVal >= endValRaw) {
setStatus('エンド時間はスタートより大きい値にしてください。', true);
} else {
setStatus('');
}
updateMarkers();
}
startTimeInput.addEventListener('change', validateTimes);
endTimeInput.addEventListener('change', validateTimes);
startTimeInput.addEventListener('input', updateMarkers);
endTimeInput.addEventListener('input', updateMarkers);
video.addEventListener('timeupdate', updateTimelineProgress);
// タイムラインクリックでシーク
timeline.addEventListener('click', (e) => {
const rect = timeline.getBoundingClientRect();
const percent = (e.clientX - rect.left) / rect.width;
video.currentTime = percent * videoDuration;
});
// マーカードラッグ
let draggingMarker = null;
function startDrag(marker, inputEl) {
return (e) => {
e.stopPropagation();
draggingMarker = { marker, inputEl };
document.addEventListener('mousemove', onDrag);
document.addEventListener('mouseup', stopDrag);
};
}
function onDrag(e) {
if (!draggingMarker) return;
const rect = timeline.getBoundingClientRect();
let percent = (e.clientX - rect.left) / rect.width;
percent = Math.max(0, Math.min(1, percent));
const time = percent * videoDuration;
draggingMarker.inputEl.value = time.toFixed(1);
validateTimes();
updateMarkers();
}
function stopDrag() {
draggingMarker = null;
document.removeEventListener('mousemove', onDrag);
document.removeEventListener('mouseup', stopDrag);
}
startMarker.addEventListener('mousedown', startDrag(startMarker, startTimeInput));
endMarker.addEventListener('mousedown', startDrag(endMarker, endTimeInput));
// ========== 録画処理 ==========
async function recordClip() {
if (recording) return;
const start = parseFloat(startTimeInput.value) || 0;
const end = parseFloat(endTimeInput.value) || videoDuration;
const playbackSpeed = parseFloat(playbackSpeedSelect.value) || 1;
const muteAudio = muteAudioCheckbox.checked;
let width;
if (resolutionSelect.value === 'original') {
width = video.videoWidth;
} else {
width = parseInt(resolutionSelect.value);
}
const bitrate = parseInt(bitrateSelect.value) * 1000;
const height = Math.round(video.videoHeight * width / video.videoWidth);
recording = true;
previewBtn.disabled = true;
rePreviewHint.hidden = true;
setStatus('録画を開始します…');
const canvas = document.createElement('canvas');
canvas.width = width;
canvas.height = height;
const ctx = canvas.getContext('2d');
const canvasStream = canvas.captureStream();
// 音声トラック追加（muteがOFFの場合のみ）
if (!muteAudio) {
const audioTracks = video.captureStream().getAudioTracks();
if (audioTracks.length > 0) {
canvasStream.addTrack(audioTracks[0]);
}
}
let mimeType = 'video/webm';
if (MediaRecorder.isTypeSupported('video/webm;codecs=vp9,opus')) {
mimeType = 'video/webm;codecs=vp9,opus';
} else if (MediaRecorder.isTypeSupported('video/webm;codecs=vp8,opus')) {
mimeType = 'video/webm;codecs=vp8,opus';
}
const recorder = new MediaRecorder(canvasStream, {
mimeType: mimeType,
videoBitsPerSecond: bitrate,
});
const chunks = [];
recorder.ondataavailable = (e) => {
if (e.data && e.data.size > 0) chunks.push(e.data);
};
recorder.onstop = () => {
const blob = new Blob(chunks, { type: recorder.mimeType });
const sizeMB = blob.size / (1024 * 1024);
if (blob.size === 0) {
setStatus('録画に失敗しました。設定を調整してください。', true);
sizeInfoEl.textContent = '出力サイズ: 0.00 MB';
downloadLink.style.display = 'none';
recording = false;
previewBtn.disabled = false;
return;
}
const url = URL.createObjectURL(blob);
previewVideo.src = url;
previewVideo.currentTime = 0;
previewVideo.play().catch(() => {});
downloadLink.href = url;
downloadLink.style.display = 'inline-block';
const audioStatus = muteAudio ? ' (音声なし)' : '';
sizeInfoEl.textContent = '出力サイズ: ' + humanSize(blob.size) + audioStatus;
if (sizeMB <= 10) {
setStatus('プレビュー完了。Discord にアップできます。');
} else {
setStatus('プレビュー完了しましたが 10MB を超えています。パラメータを調整してください。', true);
}
// 音声ありで録画したかを記録
lastPreviewHadAudio = !muteAudio;
recording = false;
previewBtn.disabled = false;
};
// ===== シーク完了を待ってから録画開始 =====
const duration = end - start;
const expectedTime = duration / playbackSpeed;
video.playbackRate = playbackSpeed;
video.currentTime = start;
// 音声ミュート設定（録画中は元動画の音を消す）
video.muted = muteAudio;
setStatus(`シーク中…`);
video.onseeked = () => {
video.onseeked = null;
recorder.start();
video.play();
const audioInfo = muteAudio ? '音声なし' : '音声あり';
setStatus(`録画中… (約${expectedTime.toFixed(1)}秒かかります / ${audioInfo})`);
function draw() {
ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
if (video.currentTime >= end || video.currentTime >= video.duration || video.ended) {
recorder.stop();
video.pause();
video.playbackRate = 1;
video.muted = false;
return;
}
requestAnimationFrame(draw);
}
draw();
};
}
previewBtn.addEventListener('click', recordClip);
// ========== 画面全体でドロップ ==========
document.body.addEventListener('dragenter', (e) => {
e.preventDefault();
document.body.classList.add('dragover');
});
document.body.addEventListener('dragover', (e) => {
e.preventDefault();
});
document.body.addEventListener('dragleave', (e) => {
if (e.target === document.body || !document.body.contains(e.relatedTarget)) {
document.body.classList.remove('dragover');
}
});
document.body.addEventListener('drop', (e) => {
e.preventDefault();
document.body.classList.remove('dragover');
const files = e.dataTransfer.files;
if (files && files[0]) {
handleFile(files[0]);
}
});
// クリックで選択
fileSelectLink.addEventListener('click', (e) => {
e.preventDefault();
fileInput.click();
});
fileInput.addEventListener('change', (e) => {
const file = e.target.files[0];
if (file) {
handleFile(file);
}
});
</script>
</body>
</html>