deepgram-core-workflow-a

# Deepgram Core Workflow A: Pre-recorded Transcription

## Overview
Implement a complete pre-recorded audio transcription workflow using Deepgram's Nova-2 model.

## Prerequisites
- Completed `deepgram-install-auth` setup
- Understanding of async patterns
- Audio files or URLs to transcribe

## Instructions

### Step 1: Set Up Transcription Service
Create a service class to handle transcription operations.

### Step 2: Implement File and URL Transcription
Add methods for both local files and remote URLs.

### Step 3: Add Feature Options
Configure punctuation, diarization, and formatting.

### Step 4: Process Results
Extract and format transcription results.

## Output
- Transcription service class
- Support for file and URL transcription
- Configurable transcription options
- Formatted transcript output

## Error Handling
| Error | Cause | Solution |
|-------|-------|----------|
| Audio Too Long | Exceeds limits | Split into chunks or use async |
| Unsupported Format | Invalid audio type | Convert to WAV/MP3/FLAC |
| Empty Response | No speech detected | Check audio quality |
| Timeout | Large file processing | Use callback URL pattern |

## Examples

### TypeScript Transcription Service
```typescript
// services/transcription.ts
import { createClient } from '@deepgram/sdk';
import { readFile } from 'fs/promises';

export interface TranscriptionOptions {
  model?: 'nova-2' | 'nova' | 'enhanced' | 'base';
  language?: string;
  punctuate?: boolean;
  diarize?: boolean;
  smartFormat?: boolean;
  utterances?: boolean;
  paragraphs?: boolean;
}

export interface TranscriptionResult {
  transcript: string;
  confidence: number;
  words: Array<{
    word: string;
    start: number;
    end: number;
    confidence: number;
  }>;
  utterances?: Array<{
    speaker: number;
    transcript: string;
    start: number;
    end: number;
  }>;
}

export class TranscriptionService {
  private client;

  constructor(apiKey: string) {
    this.client = createClient(apiKey);
  }