Building A Conferencing App With WebRTC: P2P, SFU, or MCU

WebSockets and gRPC are commonly used for simple real-time data applications, but the WebRTC protocol presents additional complexities, especially with video and audio communication. Building a video conferencing application using WebRTC involves understanding different architectures for communication, such as Peer-to-Peer (P2P), Multipoint Control Unit (MCU), and Selective Forwarding Unit (SFU). P2P networks allow direct data exchange between devices, making them suitable for small calls with minimal server resource use, but they become inefficient for larger networks due to the high number of connections required. MCUs centralize data processing on a server, reducing the number of connections but increasing server load and costs, making them ideal for large conferences and legacy systems. SFUs, a middle-ground approach, forward multiple input streams from devices without processing them, reducing server load but requiring more computational power on each device. Simulcast SFUs enhance this by offering streams of varying qualities to accommodate devices with different bandwidth capacities. Each method has its advantages and trade-offs, and the choice depends on the scale, cost, and technical requirements of the application.