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<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
<title>CAPTION.Ninja Capture Pro - Advanced Transcription with SRT/WebVTT Export</title>
<meta name="description" content="Advanced caption capture with SRT and WebVTT export, pause-based segmentation, keyboard shortcuts, and autosave. Professional transcription tool for content creators." />
<meta name="keywords" content="SRT export, WebVTT, transcription, captions, subtitles, professional captioning, OBS, streaming" />
<meta name="author" content="Steve Seguin" />
<meta name="robots" content="index, follow" />
<link rel="canonical" href="https://caption.ninja/capture-pro" />
<meta property="og:title" content="CAPTION.Ninja Capture Pro" />
<meta property="og:description" content="Advanced caption capture with SRT/WebVTT export and professional features." />
<link rel="icon" type="image/svg+xml" href="favicon.svg" />
<link rel="shortcut icon" href="favicon.svg" />
<style>
:root {
--bg: #0b0c10;
--panel: #151820;
--text: #e6e9ef;
--muted: #9aa3b2;
--primary: #2498eb;
--danger: #dc3545;
--success: #1db954;
--warning: #f0ad4e;
--radius: 8px;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
margin: 0; background: var(--bg); color: var(--text);
font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
display: grid; grid-template-rows: auto 1fr auto; gap: 10px;
}
.toolbar {
display: flex; gap: 8px; align-items: center; padding: 10px; background: var(--panel);
position: sticky; top: 0; z-index: 10; border-bottom: 1px solid #202532;
}
.spacer { flex: 1; }
.pill { padding: 6px 10px; border-radius: 20px; font-size: 12px; background: #1e2430; color: var(--muted); }
.pill.ok { color: #c8ffd7; background: rgba(29,185,84,.15); border: 1px solid rgba(29,185,84,.4); }
.pill.warn { color: #ffe3b3; background: rgba(240,173,78,.12); border: 1px solid rgba(240,173,78,.35); }
.pill.err { color: #ffd0d0; background: rgba(220,53,69,.12); border: 1px solid rgba(220,53,69,.35); }
button, select {
background: #232a36; color: var(--text); border: 1px solid #2d3543; border-radius: 6px; padding: 8px 12px;
font-weight: 600; cursor: pointer; font-size: 14px;
}
button.primary { background: var(--primary); border-color: var(--primary); color: white; }
button.ghost { background: transparent; border-color: #384252; color: var(--muted); }
button.danger { background: var(--danger); border-color: var(--danger); color: white; }
button[disabled] { opacity: .6; cursor: not-allowed; }
.output-wrap { padding: 10px; display: grid; grid-template-columns: 1fr; gap: 10px; }
.panel { background: var(--panel); border: 1px solid #202532; border-radius: var(--radius); padding: 10px; }
.viewer { font-family: Cousine, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; }
.final { font-size: 24px; line-height: 1.2; word-break: break-word; }
.interm { font-size: 18px; opacity: .85; color: #cfd6e4; }
.controls { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.settings { display: none; }
.settings.open { display: block; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
label.row { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 6px 0; color: var(--muted); }
input[type="number"], input[type="text"] { background: #232a36; color: var(--text); border: 1px solid #2d3543; border-radius: 6px; padding: 6px 8px; width: 100%; }
.footer { padding: 10px; color: var(--muted); display: flex; gap: 8px; align-items: center; }
</style>
</head>
<body>
<div class="toolbar">
<span id="recStatus" class="pill warn">idle</span>
<span id="wsStatus" class="pill warn">ws: connecting…</span>
<div class="spacer"></div>
<button id="btnToggle" class="primary">Start</button>
<button id="btnDownload">Download</button>
<button id="btnCopyLink" class="ghost">Copy Overlay Link</button>
<button id="btnMark" class="ghost">Mark Chapter</button>
<button id="btnClear" class="ghost">Clear</button>
<button id="btnSettings" class="ghost">Settings</button>
</div>
<div class="output-wrap">
<div class="panel controls">
<div style="display:flex; gap:8px; flex-wrap:wrap; align-items:center;">
<div>Room: <code id="roomCode">-</code></div>
<div>Lang:
<select id="lang">
<option value="en-US">English (US)</option>
<option value="en-GB">English (UK)</option>
<option value="es-ES">Español (ES)</option>
<option value="fr-FR">Français</option>
<option value="de-DE">Deutsch</option>
<option value="it-IT">Italiano</option>
<option value="ja-JP">日本語</option>
<option value="ko-KR">한국어</option>
<option value="pt-PT">Português</option>
</select>
</div>
<div id="overlayUrlWrap" style="display:none"></div>
</div>
</div>
<div class="panel viewer">
<div id="final" class="final"></div>
<div id="interm" class="interm"></div>
</div>
<div id="settings" class="panel settings">
<div class="grid-2">
<div>
<h3 style="margin:0 0 6px 0; font-size:14px; color:var(--muted)">Segmentation</h3>
<label class="row">Pause threshold (ms)
<input id="pauseMs" type="number" min="200" max="5000" step="50" value="600" />
</label>
<label class="row">Wrap line length (chars)
<input id="lineLen" type="number" min="20" max="60" step="2" value="42" />
</label>
</div>
<div>
<h3 style="margin:0 0 6px 0; font-size:14px; color:var(--muted)">Export</h3>
<label class="row">Include speaker tag
<input id="speakerTag" type="checkbox" checked />
</label>
<label class="row">Profanity filter
<input id="profanity" type="checkbox" />
</label>
</div>
</div>
<p style="margin:8px 0 0 0; color:var(--muted)">Note: Mic device selection is available on the premium STT page; this capture uses your browser’s default microphone.</p>
</div>
</div>
<div class="footer">
<span>Shortcuts: Space = Pause/Resume, Ctrl+S = Download SRT, Ctrl+L = Copy overlay link, M = Mark chapter</span>
</div>
<script src="ws-publisher.js"></script>
<script src="text-rules.js"></script>
<script>
// URL helpers
(function (w) {
w.URLSearchParams = w.URLSearchParams || function (searchString) {
var self = this; self.searchString = searchString;
self.get = function (name) {
var results = new RegExp('[\\?&]' + name + '=([^&#]*)').exec(self.searchString);
if (results == null) { return null; } else { return decodeURI(results[1]) || 0; }
};
};
})(window);
var urlParams = new URLSearchParams(window.location.search);
function generateSecureRoomID(len) {
var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
var text = '';
var cryptoObj = window.crypto || window.msCrypto;
if (cryptoObj && typeof cryptoObj.getRandomValues === 'function') {
var randomValues = new Uint8Array(len);
cryptoObj.getRandomValues(randomValues);
for (var i = 0; i < len; i++) {
text += chars.charAt(randomValues[i] % chars.length);
}
return text;
}
for (var j = 0; j < len; j++) {
text += chars.charAt(Math.floor(Math.random() * chars.length));
}
return text;
}
// State
var roomID = (urlParams.has('room') ? urlParams.get('room') : null);
if (!roomID) {
roomID = generateSecureRoomID(8);
try {
var u = new URL(window.location.href); u.searchParams.set('room', roomID);
window.history.replaceState({}, '', u.toString());
} catch(e) {}
}
var myLang = urlParams.has('lang') ? urlParams.get('lang') : 'en-US';
var recognition = null;
var isRunning = false;
var isPaused = false;
var wsPublisher = null;
var startEpoch = null; // absolute ms when session started
var lastStopMs = 0; // last cue end relative to startEpoch
var recBackoff = 500; // ms
var saveKey = null;
var agg = {
open: false,
startMs: null,
lastMs: null,
text: ''
};
var silenceTimer = null;
var cues = []; // {startMs, endMs, text}
var chapters = []; // {ms, label}
// UI refs
var elRoom = document.getElementById('roomCode');
var elLang = document.getElementById('lang');
var elFinal = document.getElementById('final');
var elInterm = document.getElementById('interm');
var elPauseMs = document.getElementById('pauseMs');
var elLineLen = document.getElementById('lineLen');
var elSpeaker = document.getElementById('speakerTag');
var elProf = document.getElementById('profanity');
var elRec = document.getElementById('recStatus');
var elWs = document.getElementById('wsStatus');
var elOverlayWrap = document.getElementById('overlayUrlWrap');
elRoom.textContent = roomID;
elLang.value = myLang;
elLang.addEventListener('change', function(){
myLang = this.value; try { var u = new URL(window.location.href); u.searchParams.set('lang', myLang); history.replaceState({},'',u.toString()); } catch(e) {}
if (recognition && isRunning) { try { recognition.lang = myLang; } catch(e){} }
});
// Overlay link
var baseUrl = document.URL.substr(0, document.URL.lastIndexOf('/'));
var overlayUrl = baseUrl + '/overlay?room=' + encodeURIComponent(roomID);
elOverlayWrap.style.display = 'block';
elOverlayWrap.textContent = overlayUrl;
function setRecStatus(type, text) {
elRec.className = 'pill ' + (type||''); elRec.textContent = text;
}
function setWsStatus(type, text) {
elWs.className = 'pill ' + (type||''); elWs.textContent = text;
}
var textRulesConfig = (window.CaptionTextRules && window.CaptionTextRules.parseRulesFromUrlParams)
? window.CaptionTextRules.parseRulesFromUrlParams(urlParams)
: { replacements: [], restricted: [], matchMode: 'phonetic' };
var textRulesEngine = (window.CaptionTextRules && window.CaptionTextRules.createEngine)
? window.CaptionTextRules.createEngine(textRulesConfig)
: null;
// Profanity filter (simple)
var bads = ['fuck','shit','bitch'];
function maskProfanity(s) {
if (!elProf.checked) return s;
var r = s; for (var i=0;i<bads.length;i++){ var w=bads[i]; var re=new RegExp('\\b'+w+'\\b','ig'); r = r.replace(re, w[0] + '*'.repeat(Math.max(0,w.length-2)) + w[w.length-1]); }
return r;
}
function applyTextRules(text) {
if (!textRulesEngine || typeof text !== 'string') return text;
try {
return textRulesEngine.apply(text);
} catch (e) {
console.warn('Text rules failed:', e);
return text;
}
}
function sanitize(string) {
var temp = document.createElement('div'); temp.textContent = string; var text = temp.textContent.substring(0, 500).trim();
var isRTL = /[\u0591-\u07FF\u200F\u202B\u202E\uFB1D-\uFDFD\uFE70-\uFEFC]/.test(text);
if (isRTL) { text = text.replaceAll(/[.,!?،؟؛]/g, ' '); }
text = applyTextRules(text);
return maskProfanity(text);
}
function escapeHTML(text) {
return String(text)
.replace(/&/g, '&amp;')
.replace(/</g, '&lt;')
.replace(/>/g, '&gt;')
.replace(/"/g, '&quot;')
.replace(/'/g, '&#39;');
}
function renderCaptionHtml(text, maxLen) {
return escapeHTML(wrapLines(text, maxLen)).replace(/\n/g, '<br />');
}
function formatSrtTime(ms) {
var d = new Date(0); d.setSeconds(ms/1000);
var s = d.toISOString().replace('.', ',').replace('1970-01-01T','');
return s.substring(0, s.length-1);
}
function wrapLines(text, maxLen) {
var words = text.split(/\s+/); var lines = []; var cur = '';
for (var i=0;i<words.length;i++){
var w = words[i];
if ((cur + ' ' + w).trim().length > maxLen) { lines.push(cur.trim()); cur = w; }
else { cur = (cur?cur+' ':'') + w; }
}
if (cur.trim()) lines.push(cur.trim());
return lines.join('\n');
}
function buildSrt() {
var out = ''; for (var i=0;i<cues.length;i++){ var c=cues[i]; out += (i+1)+'\n'+formatSrtTime(c.startMs)+' --> '+formatSrtTime(c.endMs)+'\n'+ (elSpeaker.checked?('>> '):'') + wrapLines(c.text, parseInt(elLineLen.value||'42')) + '\n\n'; }
return out;
}
function buildVtt() {
var out = 'WEBVTT\n\n'; for (var i=0;i<cues.length;i++){ var c=cues[i]; var start = formatSrtTime(c.startMs).replace(',', '.'); var end = formatSrtTime(c.endMs).replace(',', '.'); out += start + ' --> ' + end + '\n' + (elSpeaker.checked?('>> '):'') + wrapLines(c.text, parseInt(elLineLen.value||'42')) + '\n\n'; }
return out;
}
function buildTxt() {
var out=''; for (var i=0;i<cues.length;i++){ out += wrapLines(cues[i].text, 80)+'\n'; } return out;
}
function download(name, text) {
var a = document.createElement('a'); a.href = 'data:text/plain;charset=utf-8,'+encodeURIComponent(text); a.download = name; a.style.display='none'; document.body.appendChild(a); a.click(); document.body.removeChild(a);
}
function saveSnapshot() {
try { if (!saveKey) return; localStorage.setItem(saveKey, JSON.stringify({ ts: Date.now(), cues: cues })); } catch(e) {}
}
function startRecognition(){
if (!('webkitSpeechRecognition' in window)) { setRecStatus('err','unsupported'); alert('Speech recognition not supported. Use Chrome or Edge.'); return; }
recognition = new webkitSpeechRecognition(); recognition.lang = myLang; recognition.continuous = true; recognition.interimResults = true;
setRecStatus('ok','listening');
recognition.onstart = function(){ setRecStatus('ok','listening'); };
recognition.onerror = function(e){ setRecStatus('err', 'error: '+e.error); };
recognition.onend = function(){ if (!isRunning || isPaused) { setRecStatus('warn','paused'); return; } setRecStatus('warn','restarting…'); setTimeout(function(){ try { recognition.start(); } catch(err) { try { startRecognition(); } catch(e){} } }, recBackoff); };
recognition.onresult = function(event){
var now = Date.now(); if (!startEpoch) startEpoch = now; var rel = now - startEpoch;
var interim = '';
for (var i = event.resultIndex; i < event.results.length; ++i) {
var t = sanitize(event.results[i][0].transcript);
if (event.results[i].isFinal) {
if (!agg.open) { agg.open = true; agg.startMs = (agg.lastMs!=null ? agg.lastMs : lastStopMs); }
agg.text += (agg.text? ' ' : '') + t; agg.lastMs = rel;
if (silenceTimer) clearTimeout(silenceTimer);
silenceTimer = setTimeout(flushSegment, parseInt(elPauseMs.value||'600'));
} else {
interim += (interim? ' ' : '') + t; agg.lastMs = rel; if (!agg.open) { agg.open = true; agg.startMs = rel; }
}
}
// Show interim
if (interim.trim()) {
var interimOut = interim.trim();
elInterm.textContent = interimOut;
if (wsPublisher) {
wsPublisher.publish({ msg:true, interm:interimOut, id: cues.length+1, ln: myLang });
}
}
};
try { recognition.start(); isRunning = true; isPaused = false; } catch(e) { setRecStatus('err','failed'); }
}
function flushSegment(){
if (!agg.open || !agg.text.trim()) return;
var endMs = agg.lastMs || lastStopMs; var startMs = (agg.startMs!=null ? agg.startMs : lastStopMs);
if (endMs < startMs) endMs = startMs;
var text = agg.text.trim();
cues.push({ startMs: startMs, endMs: endMs, text: text });
lastStopMs = endMs;
elFinal.innerHTML += (elSpeaker.checked? '&gt;&gt; ' : '') + renderCaptionHtml(text, parseInt(elLineLen.value||'42')) + '<br /><br />';
elInterm.textContent = '';
// Send final to overlay (simple)
if (wsPublisher) {
wsPublisher.publish({ msg:true, final: text, id: cues.length, ln: myLang });
}
// Persist snapshot
saveSnapshot();
// Reset aggregator
agg.open = false; agg.startMs = null; agg.lastMs = null; agg.text='';
}
// WebSocket
function connectWS(){
wsPublisher = createWSPublisher({
url: 'wss://api.caption.ninja:443',
room: roomID,
onStateChange: function(nextState, snapshot){
if (nextState === 'connected') setWsStatus('ok', 'ws: connected');
else if (nextState === 'connecting') setWsStatus('warn', 'ws: connecting…');
else if (nextState === 'reconnecting') setWsStatus('warn', 'ws: reconnecting…');
else if (nextState === 'error') setWsStatus('err', 'ws: error');
else if (nextState === 'closed') setWsStatus('warn', 'ws: closed');
if (snapshot && snapshot.blockedSuspected) {
setWsStatus('err', 'ws: blocked?');
}
},
onError: function(err){
console.error('WebSocket publish error:', err);
}
});
wsPublisher.connect();
}
connectWS();
window.copyWsDebugInfo = function () {
if (!wsPublisher) return;
var snapshot = wsPublisher.getSnapshot();
var text = '[Caption.Ninja WS Debug]\\n' +
'room=' + roomID + '\\n' +
'state=' + snapshot.state + '\\n' +
'retries=' + snapshot.retryCount + '\\n' +
'queue=' + snapshot.queueLength + '\\n' +
'dropped=' + snapshot.droppedCount + '\\n' +
'blocked=' + snapshot.blockedSuspected + '\\n' +
'lastError=' + (snapshot.lastError || '') + '\\n' +
'userAgent=' + navigator.userAgent;
navigator.clipboard.writeText(text).catch(function(){});
};
// Controls
document.getElementById('btnToggle').addEventListener('click', function(){
if (!isRunning || isPaused) {
if (!startEpoch) { startEpoch = Date.now(); saveKey = 'transcription_'+roomID+'_'+startEpoch; }
startRecognition(); this.textContent = 'Pause'; this.classList.remove('primary');
} else {
try { recognition && recognition.stop(); } catch(e){}
isPaused = true; isRunning = false; setRecStatus('warn','paused'); this.textContent='Resume'; this.classList.add('primary'); flushSegment();
}
});
document.getElementById('btnSettings').addEventListener('click', function(){ document.getElementById('settings').classList.toggle('open'); });
document.getElementById('btnCopyLink').addEventListener('click', function(){ navigator.clipboard.writeText(overlayUrl).then(()=>{ this.textContent='Copied!'; setTimeout(()=> this.textContent='Copy Overlay Link', 1000); }); });
document.getElementById('btnClear').addEventListener('click', function(){ if (!confirm('Clear transcript?')) return; cues = []; chapters = []; elFinal.innerHTML=''; elInterm.textContent=''; lastStopMs=0; localStorage.removeItem(saveKey); });
document.getElementById('btnDownload').addEventListener('click', function(){ flushSegment(); download('transcription_'+roomID+'_'+(startEpoch||Date.now())+'.srt', buildSrt()); });
document.getElementById('btnMark').addEventListener('click', function(){ var now = Date.now(); if (!startEpoch) return; var rel = now - startEpoch; chapters.push({ ms: rel, label: 'Chapter '+(chapters.length+1) }); });
// Keyboard shortcuts
document.addEventListener('keydown', function(e){
var tag = (document.activeElement && document.activeElement.tagName || '').toLowerCase(); if (tag === 'input' || tag === 'textarea') return;
if (e.code === 'Space') { e.preventDefault(); document.getElementById('btnToggle').click(); }
if (e.ctrlKey && (e.key === 's' || e.key === 'S')) { e.preventDefault(); document.getElementById('btnDownload').click(); }
if (e.ctrlKey && (e.key === 'l' || e.key === 'L')) { e.preventDefault(); navigator.clipboard.writeText(overlayUrl); }
if (e.key === 'm' || e.key === 'M') { e.preventDefault(); document.getElementById('btnMark').click(); }
});
// Persist every 30s
setInterval(saveSnapshot, 30000);
// On unload, flush
window.addEventListener('beforeunload', function(){ try { flushSegment(); } catch(e){} });
// Recover snapshot button if exists
(function showRecovery(){
var keys = Object.keys(localStorage).filter(k => k.startsWith('transcription_'+roomID+'_'));
if (!keys.length) return;
var k = keys.sort().pop();
var btn = document.createElement('button'); btn.textContent = 'Recover last session';
btn.addEventListener('click', function(){ try { var data = JSON.parse(localStorage.getItem(k)); if (data && data.cues) { cues = data.cues; startEpoch = Date.now(); saveKey = k; lastStopMs = cues.length? cues[cues.length-1].endMs : 0; elFinal.innerHTML=''; for (var i=0;i<cues.length;i++){ elFinal.innerHTML += (elSpeaker.checked? '&gt;&gt; ' : '') + renderCaptionHtml(cues[i].text, parseInt(elLineLen.value||'42')) + '<br /><br />'; } } } catch(e){} this.remove(); });
document.querySelector('.toolbar').appendChild(btn);
})();
// Initial statuses
setRecStatus('warn','idle'); setWsStatus('warn','ws: connecting…');
</script>
</body>
</html>