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字幕の生成と字幕スタイルについて
オンデバイスのモデルを活用する字幕生成で、動画コンテンツのアクセシビリティを向上させましょう。この字幕生成は、発話音声の文字起こしや他言語の字幕の翻訳に対応したパワフルな新機能です。ユーザーが再生中に字幕スタイルをカスタマイズしてプレビューできる字幕スタイルのプレビュー機能と、AVKit、AVPlayerLayer、Media Accessibilityフレームワークの詳細な実装方法についても解説します。
関連する章
- 0:00 - Introduction
- 1:10 - Media authoring
- 2:14 - Subtitle generation methods
- 3:03 - Availability and support
- 4:31 - Presenting subtitles in your app
- 5:39 - Subtitle style preview
- 8:55 - Demo
- 10:20 - Next steps
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7:43 - Implement subtitle style preview
// Implement subtitle style preview import AVFoundation import MediaAccessibility func updateProfileList() { subtitleStyleProfileIDs = MACaptionAppearanceCopyProfileIDs() as? [String] ?? [] } func showPreviewStyle(subtitleStyleProfileID: String) { playerLayer.setCaptionPreviewProfileID(subtitleStyleProfileID, position: .zero, text: nil) } func stopPreviewStyle() { playerLayer.stopShowingCaptionPreview() } func setSubtitleStyle(subtitleStyleProfileID: CFString) { MACaptionAppearanceSetActiveProfileID(subtitleStyleProfileID) }
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- 0:00 - Introduction
Why people rely on subtitles for accessibility and comprehension, and what the session covers — how Apple's on-device AI-generated subtitles appear in your app, the subtitle style preview feature, and how media assets are authored.
- 1:10 - Media authoring
An overview of the traditional media authoring process, including how video, audio, and manually created subtitles are combined into the final media package.
- 2:14 - Subtitle generation methods
Discover the two use cases for on-device generated subtitles: speech transcription from source audio, and language translation from existing subtitles.
- 3:03 - Availability and support
The playback scenarios where generated subtitles work automatically — HTTP Live Streaming, video on demand, and file-based content — and the supported devices and languages, including English subtitles and translation into multiple languages.
- 4:31 - Presenting subtitles in your app
Explore options for providing a subtitle selection UI during video playback using AVPlayerViewController, AVPlayerView, and custom controls.
- 5:39 - Subtitle style preview
Explore how to implement a subtitle style preview using AVPlayerLayer and AVCaptionRenderer, allowing users to customize their viewing experience.
- 8:55 - Demo
A walkthrough of both features together — switching a camping video to generated Italian subtitles marked with a sparkle, then customizing the subtitle style for readability.
- 10:20 - Next steps
Review best practices for integrating generated subtitles and style previews into your app to improve accessibility.