Example input format

1. Introduction
Welcome to today's lesson. Today we will be learning about photosynthesis.

2. Main concept
Photosynthesis is the process by which plants convert sunlight into energy.

3. Conclusion
Thanks for watching. Don't forget to subscribe.

The number and title from each header become the filename, e.g. 01_Introduction.mp3, 02_Main_concept.mp3, 03_Conclusion.mp3.