Upload an audio file (e.g., MP3) of your YouTube video and select the audio language. The app will transcribe the audio using Whisper, generate subtitles in SRT format, and prepare a single, complete prompt that instructs ChatGPT -> o1 model to generate a chapter breakdown in the format 'mm:ss Chapter Title'.
Click the 'Copy Prompt' button to copy the entire prompt, and a brief 'Prompt Copied!' message will appear.