youtubetranscript 0.1.2

Official Dart/Flutter SDK for YouTubeTranscript.dev. Extract, transcribe, and translate YouTube video transcripts.

youtubetranscript

Official Dart/Flutter SDK for YouTubeTranscript.dev
Extract, transcribe, and translate YouTube video transcripts with a single function call.

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Why youtubetranscript?

• Captions + ASR — Extracts existing captions or transcribes audio when none are available
• 100+ languages — Translate any transcript on the fly
• Batch processing — Up to 100 videos in a single request
• Export anywhere — SRT, WebVTT, plain text, timestamped text
• Built-in search — Find keywords across transcript segments
• Typed exceptions — Granular error handling with NoCaptionsException, RateLimitException, etc.
• Automatic retries — Resilient HTTP layer with configurable retry on 5xx errors
• Flutter ready — Works in any Dart app, ships with an example Flutter widget

Installation

dart pub add youtubetranscript

Or add it manually to your pubspec.yaml:

dependencies:
  youtubetranscript: ^0.1.0

Quick Start

import 'package:youtubetranscript/youtubetranscript.dart';

void main() async {
  final yt = YouTubeTranscript('your_api_key');

  // Extract transcript
  final result = await yt.transcribe('dQw4w9WgXcQ');

  print('${result.segments.length} segments, ${result.wordCount} words');

  for (final seg in result.segments) {
    print('[${seg.startFormatted}] ${seg.text}');
  }

  yt.close();
}

Get your free API key at youtubetranscript.dev/dashboard

Features

Translate to 100+ Languages

final spanish = await yt.transcribe('dQw4w9WgXcQ', language: 'es');
final japanese = await yt.transcribe('dQw4w9WgXcQ', language: 'ja');

ASR Audio Transcription

For videos without captions — transcribe directly from audio:

final job = await yt.transcribeAsr('video_id');
final result = await yt.waitForJob(job.jobId); // polls until done
print(result.text);

Batch Processing

Process up to 100 videos in one request:

final batch = await yt.batch(['video1', 'video2', 'video3']);
for (final t in batch.completed) {
  print('${t.videoId}: ${t.wordCount} words');
}

Export Formats

result.toSrt();              // SRT subtitles
result.toVtt();              // WebVTT subtitles
result.toPlainText();        // Plain text
result.toTimestampedText();  // [MM:SS] text

Search Within Transcripts

final matches = result.search('keyword');
for (final seg in matches) {
  print('[${seg.startFormatted}] ${seg.text}');
}

Account Stats

final stats = await yt.stats();
print('Plan: ${stats.plan}');
print('Credits remaining: ${stats.creditsRemaining}');

Error Handling

Every API error maps to a typed exception so you can handle each case precisely:

try {
  final result = await yt.transcribe('video_id');
} on NoCaptionsException {
  // No captions available — fall back to ASR
  final job = await yt.transcribeAsr('video_id');
  final result = await yt.waitForJob(job.jobId);
} on AuthenticationException {
  print('Invalid API key — check youtubetranscript.dev/dashboard');
} on InsufficientCreditsException {
  print('Out of credits — top up at youtubetranscript.dev/pricing');
} on RateLimitException catch (e) {
  print('Rate limited — retry after ${e.retryAfter}s');
} on YouTubeTranscriptException catch (e) {
  print('API error: ${e.message}');
}

Flutter Widget

A ready-to-use TranscriptViewer widget is included in the examples — with search, segment listing, and error states:

TranscriptViewer(
  apiKey: 'your_api_key',
  videoId: 'dQw4w9WgXcQ',
)

See example/flutter_widget.dart for the full source.

API Reference

Method	Description
transcribe(video, {language, source, format})	Extract transcript from a video
transcribeAsr(video, {language, webhookUrl})	Transcribe from audio (async)
getJob(jobId)	Check ASR job status
waitForJob(jobId, {pollInterval, timeout})	Poll until ASR job completes
batch(videoIds, {language})	Batch extract up to 100 videos
getBatch(batchId)	Check batch status
listTranscripts({search, language})	Browse transcript history
getTranscript(videoId)	Retrieve a saved transcript
stats()	Account credits & usage info
deleteTranscript({videoId, ids})	Delete transcripts

Credit Costs

Operation	Cost
Captions extraction	1 credit
Translation	1 credit per 2,500 chars
ASR audio transcription	1 credit per 90 seconds
Re-fetch owned transcript	Free

Other SDKs

Language	Package
Python	youtubetranscript on PyPI
JavaScript/Node	youtubetranscript on npm
Dart/Flutter	You are here

License

MIT — see LICENSE

Links

• Website
• API Documentation
• Dashboard & API Key
• GitHub
• pub.dev