Serial Digital Interface (SDI) is a broadcast video standard that transmits uncompressed digital video over coaxial cables with BNC connectors. Commonly used in professional video production, live streaming, and broadcasting, SDI ensures high-quality video delivery over long distances without degradation—unlike HDMI, which can lose signal integrity over extended runs. This makes SDI a solid choice for large venues, studios, and event settings where secure, high-quality video transmission is needed.
Many production teams rely on SDI cameras and equipment to capture and distribute high-quality footage. SDI connections are particularly well-suited for professional video setups, offering locking connectors that prevent accidental disconnection—an important feature in environments where cables must remain secure. SDI cameras typically output directly to video switchers or capture devices, which then send the signal to a streaming encoder. For teams using Resi encoders, SDI provides a seamless way to integrate high-quality video sources into their live stream, ensuring a stable and uninterrupted stream.
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Another advantage of SDI is its ability to run long distances without needing signal boosters or repeaters, making it ideal for large-scale productions, multi-camera setups, and broadcast environments. Whether linking cameras to a switcher or sending video to a streaming encoder, SDI remains a trusted standard for professional video transmission.
SDI vs. Other Video Formats
The choice between SDI and other video connection types, such as HDMI or NDI, depends on the setup and transmission needs. SDI format is designed for professional environments where stable video transmission is necessary. Compared to HDMI, SDI offers several advantages:
- Longer Cable Runs: HDMI cables start losing signal quality after about 50 feet, while Serial Digital Interface cables can maintain video integrity over 300 feet or more.
- Locking Connectors: SDI cables have secure BNC connectors that prevent accidental disconnection, making them more reliable in live production settings.
- Uncompressed Video Transmission: SDI sends an uncompressed signal, reducing latency and preserving video quality for live streaming and broadcast applications.
For churches with multi-camera setups or large auditoriums, SDI helps maintain consistent video quality without the risk of signal degradation over long distances. Resi streaming solutions support SDI input, allowing churches to integrate SDI-based equipment into their live streaming workflow.
How to Choose the Right SDI Cable
The type of Serial Digital Interface cable used affects video transmission quality. Different SDI standards support varying resolutions and frame rates, so selecting the right cable is important for maintaining video clarity.
Standard SDI cable types include:
- SD-SDI (Standard Definition SDI): Supports lower-resolution video and is mostly outdated.
- HD-SDI (High Definition SDI): Handles 720p and 1080i video formats.
- 3G-SDI: Supports full HD (1080p) at higher frame rates.
- 6G-SDI and 12G-SDI: Designed for 4K video transmission, often used in high-end production environments.
Churches planning to upgrade to 4K streaming may consider 12G-SDI cables, especially for long-term video infrastructure.
SDI video is widely used in live streaming and professional production because of its ability to transmit uncompressed video over long distances without signal loss. Churches using SDI cameras and SDI connections can link their equipment securely, preventing accidental disconnections and maintaining high-quality video transmission.For more information on setting up a live streaming system, visit Resi’s Getting Started Guide.