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https://github.com/HolgerHatGarKeineNode/einundzwanzig-nostr.git
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🎨 Add new Flux icons: implement multiple reusable icon components (e.g., hand-raised, hand-thumb-up, heart, hashtag, home) with variant support for improved UI consistency.
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---
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name: display-captions
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description: Displaying captions in Remotion with TikTok-style pages and word highlighting
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metadata:
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tags: captions, subtitles, display, tiktok, highlight
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---
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# Displaying captions in Remotion
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This guide explains how to display captions in Remotion, assuming you already have captions in the `Caption` format.
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## Prerequisites
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First, the @remotion/captions package needs to be installed.
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If it is not installed, use the following command:
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```bash
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npx remotion add @remotion/captions # If project uses npm
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bunx remotion add @remotion/captions # If project uses bun
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yarn remotion add @remotion/captions # If project uses yarn
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pnpm exec remotion add @remotion/captions # If project uses pnpm
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```
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## Creating pages
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Use `createTikTokStyleCaptions()` to group captions into pages. The `combineTokensWithinMilliseconds` option controls how many words appear at once:
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```tsx
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import {useMemo} from 'react';
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import {createTikTokStyleCaptions} from '@remotion/captions';
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import type {Caption} from '@remotion/captions';
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// How often captions should switch (in milliseconds)
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// Higher values = more words per page
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// Lower values = fewer words (more word-by-word)
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const SWITCH_CAPTIONS_EVERY_MS = 1200;
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const {pages} = useMemo(() => {
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return createTikTokStyleCaptions({
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captions,
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combineTokensWithinMilliseconds: SWITCH_CAPTIONS_EVERY_MS,
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});
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}, [captions]);
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```
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## Rendering with Sequences
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Map over the pages and render each one in a `<Sequence>`. Calculate the start frame and duration from the page timing:
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```tsx
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import {Sequence, useVideoConfig, AbsoluteFill} from 'remotion';
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import type {TikTokPage} from '@remotion/captions';
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const CaptionedContent: React.FC = () => {
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const {fps} = useVideoConfig();
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return (
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<AbsoluteFill>
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{pages.map((page, index) => {
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const nextPage = pages[index + 1] ?? null;
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const startFrame = (page.startMs / 1000) * fps;
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const endFrame = Math.min(
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nextPage ? (nextPage.startMs / 1000) * fps : Infinity,
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startFrame + (SWITCH_CAPTIONS_EVERY_MS / 1000) * fps,
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);
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const durationInFrames = endFrame - startFrame;
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if (durationInFrames <= 0) {
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return null;
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}
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return (
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<Sequence
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key={index}
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from={startFrame}
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durationInFrames={durationInFrames}
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>
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<CaptionPage page={page} />
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</Sequence>
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);
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})}
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</AbsoluteFill>
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);
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};
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```
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## Word highlighting
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A caption page contains `tokens` which you can use to highlight the currently spoken word:
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```tsx
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import {AbsoluteFill, useCurrentFrame, useVideoConfig} from 'remotion';
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import type {TikTokPage} from '@remotion/captions';
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const HIGHLIGHT_COLOR = '#39E508';
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const CaptionPage: React.FC<{page: TikTokPage}> = ({page}) => {
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const frame = useCurrentFrame();
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const {fps} = useVideoConfig();
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// Current time relative to the start of the sequence
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const currentTimeMs = (frame / fps) * 1000;
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// Convert to absolute time by adding the page start
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const absoluteTimeMs = page.startMs + currentTimeMs;
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return (
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<AbsoluteFill style={{justifyContent: 'center', alignItems: 'center'}}>
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<div style={{fontSize: 80, fontWeight: 'bold', whiteSpace: 'pre'}}>
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{page.tokens.map((token) => {
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const isActive =
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token.fromMs <= absoluteTimeMs && token.toMs > absoluteTimeMs;
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return (
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<span
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key={token.fromMs}
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style={{color: isActive ? HIGHLIGHT_COLOR : 'white'}}
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>
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{token.text}
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</span>
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);
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})}
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</div>
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</AbsoluteFill>
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);
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};
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```
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