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feat(web-test): smart TTS pause in showCaption + fix addNarration robustness

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showCaption now auto-waits for estimated TTS duration during recording
(~100ms/char, min 2s). Subsequent wait() uses credit system to avoid
double-waiting. addNarration: cap atempo at 1.3x (was 2.5x), replace
-shortest with explicit -t to prevent video truncation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Nick Shirokov
2026-03-12 11:59:57 +03:00
parent de7e943de1
commit c6a84e2f91
2 changed files with 32 additions and 7 deletions
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.claude/skills/web-test/scripts/browser.mjs
+28 -5
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@@ -2955,7 +2955,15 @@ export async function screenshot() {
/** Wait for a specified number of seconds. */
export async function wait(seconds) {
ensureConnected();
await page.waitForTimeout(seconds * 1000);
let ms = seconds * 1000;
// Credit system: if showCaption already waited for TTS, subtract that time
if (recorder && recorder.captionCredit) {
const elapsed = Date.now() - recorder.captionCredit.at;
const credit = Math.max(0, recorder.captionCredit.waitedMs - elapsed);
ms = Math.max(0, ms - credit);
recorder.captionCredit = null;
}
if (ms > 0) await page.waitForTimeout(ms);
return await getFormState();
}
@@ -3131,10 +3139,13 @@ export async function showCaption(text, opts = {}) {
ensureConnected();
// Collect caption for TTS narration if recording
let smartWaitMs = 0;
if (recorder && text.trim() && opts.speech !== false) {
const speech = typeof opts.speech === 'string' ? opts.speech : text;
// Use video timeline position (accounts for frame duplication) instead of wall-clock
recorder.captions.push({ text, speech, time: Math.round(recorder.videoTimeMs) });
// Estimate TTS duration and wait so the video has enough screen time for voiceover
smartWaitMs = Math.max(2000, speech.length * 100);
}
const position = opts.position || 'bottom';
const fontSize = opts.fontSize || 24;
@@ -3160,6 +3171,12 @@ export async function showCaption(text, opts = {}) {
el.style.color = color;
el.textContent = text;
}, { text, position, fontSize, bg, color });
// Smart TTS wait: pause for estimated speech duration so video has enough screen time
if (smartWaitMs > 0) {
await page.waitForTimeout(smartWaitMs);
recorder.captionCredit = { waitedMs: smartWaitMs, at: Date.now() };
}
}
/** Remove the caption overlay from the page. */
@@ -3293,12 +3310,17 @@ export async function addNarration(videoPath, opts = {}) {
ffmpegInputs.push('-i', ttsFile);
const filters = [];
// Speed up TTS if it's longer than gap to next caption
// Speed up TTS slightly if it's longer than gap to next caption (max 1.3x)
if (i < captions.length - 1) {
const maxDuration = (captions[i + 1].time - captions[i].time) / 1000;
if (ttsDuration > maxDuration && maxDuration > 0.1) {
const tempo = Math.min(ttsDuration / maxDuration, 2.5);
filters.push(`atempo=${tempo.toFixed(4)}`);
const tempo = ttsDuration / maxDuration;
if (tempo <= 1.3) {
filters.push(`atempo=${tempo.toFixed(4)}`);
} else {
// Too fast — let audio overlap instead of distorting
warnings.push(`Caption ${i + 1}/${captions.length}: TTS ${ttsDuration.toFixed(1)}s > gap ${maxDuration.toFixed(1)}s (need ${Math.round(ttsDuration - maxDuration)}s more pause)`);
}
}
}
@@ -3328,7 +3350,8 @@ export async function addNarration(videoPath, opts = {}) {
'-y', '-i', videoPath, '-i', narrationPath,
'-c:v', 'copy', '-c:a', 'aac', '-b:a', '128k',
'-map', '0:v:0', '-map', '1:a:0',
'-shortest', '-movflags', '+faststart', outputPath,
'-t', String(Math.ceil(videoDuration)),
'-movflags', '+faststart', outputPath,
], { stdio: 'pipe', timeout: 120000 });
const stats = statSync(outputPath);