reszta poprawek

2026-08-09 09:47:34 +02:00
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+---
+name: remotion-captions
+description: Transcribing, displaying and animating captions
+metadata:
+  tags: subtitles, captions, remotion, json
+---
+
+All captions must be processed in JSON. The captions must use the [`Caption`](https://www.remotion.dev/docs/captions/caption.md) type which is the following:
+
+```ts
+import type { Caption } from "@remotion/captions";
+```
+
+This is the definition:
+
+```ts
+type Caption = {
+  text: string;
+  startMs: number;
+  endMs: number;
+  timestampMs: number | null;
+  confidence: number | null;
+};
+```
+
+## Generating captions
+
+To transcribe video and audio files to generate captions, load the [transcribe-captions.md](transcribe-captions.md) file for more instructions.
+
+## Displaying captions
+
+To display captions in your video, load the [display-captions.md](display-captions.md) file for more instructions.
+
+## Importing captions
+
+To import captions from a .srt file, load the [import-srt-captions.md](import-srt-captions.md) file for more instructions.
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+---
+name: display-captions
+description: Displaying captions in Remotion with TikTok-style pages and word highlighting
+metadata:
+  tags: captions, subtitles, display, tiktok, highlight
+---
+
+# Displaying captions in Remotion
+
+This guide explains how to display captions in Remotion, assuming you already have captions in the [`Caption`](https://www.remotion.dev/docs/captions/caption) format.
+
+## Prerequisites
+
+Read [Transcribing audio](transcribe-captions.md) for how to generate captions.
+
+First, the [`@remotion/captions`](https://www.remotion.dev/docs/captions) package needs to be installed.
+If it is not installed, use the following command:
+
+```bash
+npx remotion add @remotion/captions
+```
+
+## Fetching captions
+
+First, fetch your captions JSON file. Use [`useDelayRender()`](https://www.remotion.dev/docs/use-delay-render) to hold the render until the captions are loaded:
+
+```tsx
+import { useState, useEffect, useCallback } from "react";
+import { AbsoluteFill, staticFile, useDelayRender } from "remotion";
+import type { Caption } from "@remotion/captions";
+
+export const MyComponent: React.FC = () => {
+  const [captions, setCaptions] = useState<Caption[] | null>(null);
+  const { delayRender, continueRender, cancelRender } = useDelayRender();
+  const [handle] = useState(() => delayRender());
+
+  const fetchCaptions = useCallback(async () => {
+    try {
+      // Assuming captions.json is in the public/ folder.
+      const response = await fetch(staticFile("captions123.json"));
+      const data = await response.json();
+      setCaptions(data);
+      continueRender(handle);
+    } catch (e) {
+      cancelRender(e);
+    }
+  }, [continueRender, cancelRender, handle]);
+
+  useEffect(() => {
+    fetchCaptions();
+  }, [fetchCaptions]);
+
+  if (!captions) {
+    return null;
+  }
+
+  return <AbsoluteFill>{/* Render captions here */}</AbsoluteFill>;
+};
+```
+
+## Creating pages
+
+Use `createTikTokStyleCaptions()` to group captions into pages. The `combineTokensWithinMilliseconds` option controls how many words appear at once:
+
+```tsx
+import { useMemo } from "react";
+import { createTikTokStyleCaptions } from "@remotion/captions";
+import type { Caption } from "@remotion/captions";
+
+// How often captions should switch (in milliseconds)
+// Higher values = more words per page
+// Lower values = fewer words (more word-by-word)
+const SWITCH_CAPTIONS_EVERY_MS = 1200;
+
+const { pages } = useMemo(() => {
+  return createTikTokStyleCaptions({
+    captions,
+    combineTokensWithinMilliseconds: SWITCH_CAPTIONS_EVERY_MS,
+  });
+}, [captions]);
+```
+
+## Rendering with Sequences
+
+Map over the pages and render each one in a `<Sequence>`. Calculate the start frame and duration from the page timing:
+
+```tsx
+import { Sequence, useVideoConfig, AbsoluteFill } from "remotion";
+import type { TikTokPage } from "@remotion/captions";
+
+const CaptionedContent: React.FC = () => {
+  const { fps } = useVideoConfig();
+
+  return (
+    <AbsoluteFill>
+      {pages.map((page, index) => {
+        const nextPage = pages[index + 1] ?? null;
+        const startFrame = (page.startMs / 1000) * fps;
+        const endFrame = Math.min(
+          nextPage ? (nextPage.startMs / 1000) * fps : Infinity,
+          startFrame + (SWITCH_CAPTIONS_EVERY_MS / 1000) * fps,
+        );
+        const durationInFrames = endFrame - startFrame;
+
+        if (durationInFrames <= 0) {
+          return null;
+        }
+
+        return (
+          <Sequence
+            key={index}
+            from={startFrame}
+            durationInFrames={durationInFrames}
+          >
+            <CaptionPage page={page} />
+          </Sequence>
+        );
+      })}
+    </AbsoluteFill>
+  );
+};
+```
+
+## White-space preservation
+
+The captions are whitespace sensitive. You should include spaces in the `text` field before each word. Use `whiteSpace: "pre"` to preserve the whitespace in the captions.
+
+## Separate component for captions
+
+Put captioning logic in a separate component.  
+Make a new file for it.
+
+## Word highlighting
+
+A caption page contains `tokens` which you can use to highlight the currently spoken word:
+
+```tsx
+import { AbsoluteFill, useCurrentFrame, useVideoConfig } from "remotion";
+import type { TikTokPage } from "@remotion/captions";
+
+const HIGHLIGHT_COLOR = "#39E508";
+
+const CaptionPage: React.FC<{ page: TikTokPage }> = ({ page }) => {
+  const frame = useCurrentFrame();
+  const { fps } = useVideoConfig();
+
+  // Current time relative to the start of the sequence
+  const currentTimeMs = (frame / fps) * 1000;
+  // Convert to absolute time by adding the page start
+  const absoluteTimeMs = page.startMs + currentTimeMs;
+
+  return (
+    <AbsoluteFill style={{ justifyContent: "center", alignItems: "center" }}>
+      <div style={{ fontSize: 80, fontWeight: "bold", whiteSpace: "pre" }}>
+        {page.tokens.map((token) => {
+          const isActive =
+            token.fromMs <= absoluteTimeMs && token.toMs > absoluteTimeMs;
+
+          return (
+            <span
+              key={token.fromMs}
+              style={{ color: isActive ? HIGHLIGHT_COLOR : "white" }}
+            >
+              {token.text}
+            </span>
+          );
+        })}
+      </div>
+    </AbsoluteFill>
+  );
+};
+```
+
+## Display captions alongside video content
+
+By default, put the captions alongside the video content, so the captions are in sync.  
+For each video, make a new captions JSON file.
+
+```tsx
+<AbsoluteFill>
+  <Video src={staticFile("video.mp4")} />
+  <CaptionPage page={page} />
+</AbsoluteFill>
+```
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+---
+name: import-srt-captions
+description: Importing .srt subtitle files into Remotion using @remotion/captions
+metadata:
+  tags: captions, subtitles, srt, import, parse
+---
+
+# Importing .srt subtitles into Remotion
+
+If you have an existing `.srt` subtitle file, you can import it into Remotion using `parseSrt()` from `@remotion/captions`.
+
+If you don't have a .srt file, read [Transcribing audio](transcribe-captions.md) for how to generate captions instead.
+
+## Prerequisites
+
+First, the @remotion/captions package needs to be installed.
+If it is not installed, use the following command:
+
+```bash
+npx remotion add @remotion/captions # If project uses npm
+bunx remotion add @remotion/captions # If project uses bun
+yarn remotion add @remotion/captions # If project uses yarn
+pnpm exec remotion add @remotion/captions # If project uses pnpm
+```
+
+## Reading an .srt file
+
+Use `staticFile()` to reference an `.srt` file in your `public` folder, then fetch and parse it:
+
+```tsx
+import { useState, useEffect, useCallback } from "react";
+import { AbsoluteFill, staticFile, useDelayRender } from "remotion";
+import { parseSrt } from "@remotion/captions";
+import type { Caption } from "@remotion/captions";
+
+export const MyComponent: React.FC = () => {
+  const [captions, setCaptions] = useState<Caption[] | null>(null);
+  const { delayRender, continueRender, cancelRender } = useDelayRender();
+  const [handle] = useState(() => delayRender());
+
+  const fetchCaptions = useCallback(async () => {
+    try {
+      const response = await fetch(staticFile("subtitles.srt"));
+      const text = await response.text();
+      const { captions: parsed } = parseSrt({ input: text });
+      setCaptions(parsed);
+      continueRender(handle);
+    } catch (e) {
+      cancelRender(e);
+    }
+  }, [continueRender, cancelRender, handle]);
+
+  useEffect(() => {
+    fetchCaptions();
+  }, [fetchCaptions]);
+
+  if (!captions) {
+    return null;
+  }
+
+  return <AbsoluteFill>{/* Use captions here */}</AbsoluteFill>;
+};
+```
+
+Remote URLs are also supported - you can `fetch()` a remote file via URL instead of using `staticFile()`.
+
+## Using imported captions
+
+Once parsed, the captions are in the `Caption` format and can be used with all `@remotion/captions` utilities.
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+---
+name: transcribe-captions
+description: Transcribing audio to generate captions in Remotion
+metadata:
+  tags: captions, transcribe, whisper, audio, speech-to-text
+---
+
+# Transcribing audio
+
+To transcribe audio to generate captions in Remotion, you can use the [`transcribe()`](https://www.remotion.dev/docs/install-whisper-cpp/transcribe) function from the [`@remotion/install-whisper-cpp`](https://www.remotion.dev/docs/install-whisper-cpp) package.
+
+## Prerequisites
+
+First, the @remotion/install-whisper-cpp package needs to be installed.
+If it is not installed, use the following command:
+
+```bash
+npx remotion add @remotion/install-whisper-cpp
+```
+
+## Transcribing
+
+Make a Node.js script to download Whisper.cpp and a model, and transcribe the audio.
+
+```ts
+import path from "path";
+import {
+  downloadWhisperModel,
+  installWhisperCpp,
+  transcribe,
+  toCaptions,
+} from "@remotion/install-whisper-cpp";
+import fs from "fs";
+
+const to = path.join(process.cwd(), "whisper.cpp");
+
+await installWhisperCpp({
+  to,
+  version: "1.5.5",
+});
+
+await downloadWhisperModel({
+  model: "medium.en",
+  folder: to,
+});
+
+// Convert the audio to a 16KHz wav file first if needed:
+// import {execSync} from 'child_process';
+// execSync('ffmpeg -i /path/to/audio.mp4 -ar 16000 /path/to/audio.wav -y');
+
+const whisperCppOutput = await transcribe({
+  model: "medium.en",
+  whisperPath: to,
+  whisperCppVersion: "1.5.5",
+  inputPath: "/path/to/audio123.wav",
+  tokenLevelTimestamps: true,
+});
+
+// Optional: Apply our recommended postprocessing
+const { captions } = toCaptions({
+  whisperCppOutput,
+});
+
+// Write it to the public/ folder so it can be fetched from Remotion
+fs.writeFileSync("captions123.json", JSON.stringify(captions, null, 2));
+```
+
+Transcribe each clip individually and create multiple JSON files.
+
+See [Displaying captions](display-captions.md) for how to display the captions in Remotion.