graph TD A[Start] --> B[Receive MP4 URL] B --> C[Validate URL Format] C --> D{URL Valid?} D -->|No| E[Return Error Message] E --> A D -->|Yes| F[Call Skill #207: Get Transcription] F --> G{Transcription Successful?} G -->|No| H[Log Error] H --> A G -->|Yes| I[Format Timestamps] I --> J[Generate time-stamped-transcript] J --> K[Output Transcription File] K --> L[End]