Comment transcrire automatiquement des vidéos de cours
La façon la plus rapide de transcrire automatiquement une vidéo de cours est d'utiliser Lessonscriptor — une extension Chrome gratuite qui transcrit n'importe quelle vidéo en temps réel, directement dans votre navigateur. Sans upload, sans attente, sans abonnement.
Why manual note-taking during lectures fails
Writing by hand during a lecture forces you to split your attention between listening, understanding, and writing — often all at the same time. Research consistently shows that students who transcribe lectures word-for-word retain less of the content than those who actively engage with it. The problem isn't discipline. It's the tool. When you're busy writing, you're not learning.
How AI transcription works in a browser
Lessonscriptor uses two transcription engines. The free mode uses the Web Speech API, which is built into Chrome and processes audio locally on your device — nothing ever leaves your computer. The premium mode uses Grok (xAI), which captures the audio directly from the browser tab and sends it to the API for transcription, returning highly accurate text within seconds.
Step-by-step: how to transcribe a lecture video with Lessonscriptor
- Install Lessonscriptor from the Chrome Web Store — it's free, no sign-up required.
- Open your lecture video in Chrome (YouTube, Coursera, Zoom recording, university portal, or any video platform).
- Click the Lessonscriptor icon in your Chrome toolbar to open the side panel.
- Hit play on the video — transcription starts automatically and text appears in real-time.
- Edit as you watch: click to add your own notes, highlight key concepts in color, bold terminology, delete tangents.
- Click any timestamp in the transcript to jump back to that exact moment in the video.
- When done, export to Markdown to get a formatted document with all your highlights and formatting.
Free mode vs Premium mode — which to use for lectures
For most students, free mode is enough. It works well in a quiet environment with speakers on. If you prefer headphones, or if you're transcribing content with heavy technical vocabulary, accents, or fast speech, Premium mode gives significantly better accuracy at about €1 per hour.
How to study from your transcript
Once transcribed, treat your Lessonscriptor document like a study guide. Highlight the most important concepts in yellow. Bold key terminology. Add your own interpretation in brackets as you review. Export to Markdown and import into Notion or Obsidian for long-term storage. Search the full text before exams.