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references/multimodal-guide.md

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+# Multimodal Guide
+
+Complete guide to using images, video, audio, and PDFs with Gemini API.
+
+---
+
+## Supported Formats
+
+### Images
+- JPEG, PNG, WebP, HEIC, HEIF
+- Max size: 20MB
+
+### Video
+- MP4, MPEG, MOV, AVI, FLV, MPG, WebM, WMV
+- Max size: 2GB
+- Max length (inline): 2 minutes
+
+### Audio
+- MP3, WAV, FLAC, AAC, OGG, OPUS
+- Max size: 20MB
+
+### PDFs
+- Max size: 30MB
+- Text-based PDFs work best
+
+---
+
+## Usage Pattern
+
+```typescript
+contents: [
+  {
+    parts: [
+      { text: 'Your question' },
+      {
+        inlineData: {
+          data: base64EncodedData,
+          mimeType: 'image/jpeg' // or video/mp4, audio/mp3, application/pdf
+        }
+      }
+    ]
+  }
+]
+```
+
+---
+
+## Best Practices
+
+- Use specific, detailed prompts
+- Combine multiple modalities in one request
+- For large files (>2GB), use File API (Phase 2)
+
+---
+
+## Official Docs
+
+https://ai.google.dev/gemini-api/docs/vision