Introduction
A 4-channel SDI encoder is a professional video solution that converts four simultaneous SDI inputs into digital streams for IP distribution. These powerful devices are essential for:
✔ Broadcast studios
✔ Live sports production
✔ House of worship streaming
✔ Multi-camera event coverage
✔ Security surveillance systems
This comprehensive guide covers everything from technical specs to real-world installation tips for these workhorse encoders.
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Why Choose a 4-Channel SDI Encoder?
Key Benefits Over Single-Channel Models
- Cost savings (40-60% vs. four single encoders)
- Rack space efficiency (1RU for four channels)
- Unified management (control all channels together)
- Synchronized outputs (perfect for multi-view applications)
Typical Applications
- Live production: Encode ISO camera feeds
- Digital signage: Multiple content sources
- Medical imaging: OR cameras to displays
- Education: Lecture capture systems
- Transportation: Airport flight info displays
Top 5
1. AJA ROI-SDI
✔ Pros:
- 4x 3G-SDI inputs
- H.264/H.265 encoding
- 1RU compact design
- Frame synchronization
✔ Cons: - No 12G-SDI support
- Basic web interface
Best for: Broadcast auxiliary encoding
2. Blackmagic Design ATEM Television Studio HD8
✔ Pros:
- 8x SDI inputs (4 encodable simultaneously)
- Built-in production switcher
- Includes control surface
- Affordable price
✔ Cons: - Only 1080p maximum
- No H.265 option
Best for: Live event multi-camera streaming
3. Haivision KB4
✔ Pros:
- 4x 12G-SDI inputs
- Ultra-low latency (<80ms)
- HEVC/H.265 support
- SRT/RIST protocol support
✔ Cons: - Enterprise pricing
- Complex configuration
Best for: High-end sports production
4. Epiphan Pearl Nano
✔ Pros:
- 4x HDMI/SDI combo inputs
- Records while streaming
- Built-in multi-viewer
- User-friendly interface
✔ Cons: - Software encoding limits channel count
- No 4K60 support
Best for: Education and corporate AV
5. ZeeVee MX110-4
✔ Pros:
- Modular chassis design
- Hot-swappable encoders
- Advanced monitoring
- Redundant power supplies
✔ Cons: - Very expensive
- Requires professional installation
Best for: 24/7 broadcast operations
Key Features Comparison
| Feature | Entry-Level | Professional | Broadcast-Grade |
|---|---|---|---|
| Max Resolution | 1080p30 | 1080p60 | 4K60 |
| Encoding | H.264 | H.264/H.265 | HEVC 10-bit |
| Latency | 500ms | 100-300ms | <80ms |
| Inputs | 3G-SDI | 6G-SDI | 12G-SDI |
| Management | Web GUI | SNMP/API | Enterprise software |
Technical Specifications Explained
1. SDI Standards Support
- 3G-SDI: 1080p60 maximum
- 6G-SDI: 4K30 support
- 12G-SDI: Full 4K60 capability
2. Encoding Formats
- H.264: Widely compatible
- H.265: 40% bandwidth savings
- JPEG2000: Lossless quality
3. Network Protocols
- RTMP: For social media streaming
- SRT: Secure Internet Transport
- RIST: Reliable contribution
- HLS: Adaptive streaming
Buying Guide
For Live Events
- Priority: Low latency, switching
- Recommended: Blackmagic ATEM HD8
For Broadcast
- Priority: Reliability, monitoring
- Recommended: AJA ROI-SDI
For Security
- Priority: Continuous recording
- Recommended: Axis Communications Q1615
For Digital Signage
- Priority: Ease of management
- Recommended: BrightSign XD1142
Installation & Setup
Typical Workflow
- Connect SDI sources (cameras, media players)
- Configure encoding settings per channel:
- Resolution: Match source
- Bitrate: 8-15Mbps per 1080p channel
- Protocol: RTMP/SRT for remote viewing
- Connect to network switch
- Distribute to decoders/players
Optimal Settings
- GOP Structure: IBP, 1-2 second intervals
- Bitrate Control: CBR for consistent quality
- Audio: Embedded SDI or separate inputs
Common Mistakes
- Using incorrect SDI cable grade
- Overloading network bandwidth
- Ignoring heat dissipation in racks
Personal Experience: Sports Production
When covering college basketball:
- Used Haivision KB4 for four ISO cameras
- Set 80ms latency for live switching
- H.265 encoding saved 40% bandwidth
- SRT protocol handled shaky internet
Result: Professional multi-cam stream from a gym with poor infrastructure.
FAQs
Q: Can I mix resolutions (4K + 1080p)?
A: Yes, most encoders automatically scale inputs.
Q: What bitrate for four 1080p streams?
A: ~40- 60 Mbps total (10- 15 Mbps per channel).
Q: Do I need special SDI cables?
A: Use true 75Ω coax – cheap cables cause signal loss.
Q: Can these records be made locally?
A: Some models, like Epiphan Pear,l can record while streaming.
Q: How many decoders do I need?
A: One decoder per display (or use multicast).
Future of Multi-Channel Encoding
Emerging trends:
- AI-based bitrate optimization
- 8K-ready chassis
- Cloud management dashboards
- 5G wireless backhaul
Final Recommendations 4 Channel SDI Encoder
Best Overall: AJA ROI-SDI
Best Budget: Blackmagic ATEM HD8
Most Advanced: Haivision KB4
Choose a four channel SDI encoder when you need:
✅ Professional multi-camera handling
✅ Rack space efficiency
✅ Unified stream management
Need help selecting the right model? Ask below! 🎥
Where to Buy:
- B&H Photo Video
- Adorama
- Specialty AV distributors
- Direct from manufacturers
Read More: 8-channel HDMI encoder
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