UDP Vs TCP Which One Is Better for Streaming?

The quality of your video and hence the viewers’ experience majorly depends on the streaming protocol you adopt. For any streaming or VOD business, this should be one of your focus areas to ensure the optimum video quality and better audience experience.

Especially for live streaming, the process becomes even more complex.

TCP and UDP are the two most widely used transport-layer protocols that make different trade-offs between reliability, latency, and overhead. TCP provides reliable, ordered delivery, while UDP sends datagrams with minimal transport overhead and no built-in retransmission. For streaming, TCP-based delivery is common for HTTP video such as VOD, while UDP-based protocols are often used for real-time applications where low latency matters more than perfect delivery.

This blog talks about the two transport layer protocols, and it’s not a question of which is better. It’s about what works best for your use case. 

What Is UDP Streaming Protocol?

The UDP streaming protocol is one of the most popular video streaming protocols. The UDP or User Datagram Protocol refers to a lightweight data transfer protocol that works on the top of IP. While this protocol helps in detecting the corrupt data in the data packets, it is not that efficient in solving the issues such as out of order or lost data packets. 

UDP, or User Datagram Protocol, is a connectionless transport protocol designed with a much smaller set of built-in mechanisms than TCP. Importantly, UDP is not completely without error detection. Its header contains a checksum for detecting corruption. What UDP does not provide is TCP-style recovery through acknowledgments and retransmission.

How does UDP Work?

A simplified UDP workflow looks like this:

1. An application gives data to UDP.
2. UDP places the data into a datagram.
3. The datagram is sent toward its destination.
4. The receiver processes it if it arrives.
5. UDP does not automatically retransmit a missing datagram or reorder datagrams.

This makes UDP lightweight and useful for applications where low delay is more important than guaranteed delivery. UDP is highly sought-after in time-sensitive streaming applications such as live streaming, online gaming, and others.

Advantages & Disadvantages of UDP

Advantages of UDP

• Low Latency: Sends data without connection establishment or waiting for acknowledgments, making it suitable for real-time applications.
• Low Protocol Overhead: Uses a smaller header than TCP, reducing the amount of additional data sent with each packet.
• Connectionless Communication: Does not require a connection to be established before transmitting data.
• Faster Data Transmission: Avoids retransmissions and acknowledgment mechanisms, allowing data to be sent quickly.
• Suitable for Real-Time Applications: Commonly used for live video, voice communication, online gaming, and interactive applications.
• Supports Multicast and Broadcast: Can efficiently deliver data to multiple recipients at the same time.
• Flexible Reliability: Applications can implement their own reliability, sequencing, or recovery mechanisms when required.

Disadvantages of UDP

• No Guaranteed Delivery: Packets may be lost without being retransmitted automatically.
• No Guaranteed Ordering: Data may arrive out of sequence.
• No Built-in Error Recovery: Applications must handle packet recovery when necessary.
• No Flow Control: UDP does not automatically prevent a sender from overwhelming the receiver.
• No Congestion Control: It does not provide TCP-style mechanisms for managing network congestion.
• Less Reliable for Critical Data: It may not be suitable when every packet must reach the destination accurately and completely.
• Application-Level Complexity: If reliability, sequencing, or recovery is required, these mechanisms must be implemented by the application or a higher-level protocol.

What Is TCP Streaming Protocol?

TCP, or Transmission Control Protocol, is a connection-oriented transport protocol that provides reliable, ordered communication between two endpoints. Before data is exchanged, TCP establishes a connection using a three-way handshake. Once the connection is established, TCP tracks transmitted data using sequence numbers, acknowledgments, retransmissions, and other mechanisms.

TCP treats application data as a continuous byte stream rather than as independent messages. If some data is lost during transmission, TCP can retransmit it. It also uses flow control to prevent a sender from overwhelming a receiver and congestion-control mechanisms to respond to changing network conditions.

How does TCP Work?

The TCP streaming protocol works with a technique called positive acknowledgement with retransmission. This implies that if a data packet is sent but a positive acknowledgement is not received, then a copy of the same data packet is retransmitted again. Being a reliable streaming protocol, it is often the first choice for streamers to ensure a highly reliable end-to-end byte stream over an unreliable network.

TCP begins communication with a three-way handshake. The sender first sends a SYN packet, the receiver responds with SYN-ACK, and the sender completes the process with an ACK. After the connection is established, application data can be transmitted.

SYN and ACK are TCP control flags used during the three-way handshake, which establishes a TCP connection between two devices.

• SYN (Synchronize): A SYN packet is used to initiate a TCP connection and synchronize sequence numbers between the two devices. Think of it as: “I want to start a connection with you.”
• ACK (Acknowledgment): An ACK indicates that a device has received and acknowledged the other device’s message. Think of it as: “I received your request.”

As data travels across the network, TCP uses sequence numbers and acknowledgments to keep track of what has been received. If a segment is lost or needs to be retransmitted, TCP can send it again. This allows the receiving application to obtain a reliable, ordered stream of data.

This behavior makes TCP suitable for applications where losing or corrupting data is unacceptable. Web pages, file transfers, APIs, and many other internet applications depend on this reliability.

Advantages & Disadvantages of TCP

Advantages of TCP

• Reliable Data Delivery: Ensures data reaches the destination accurately and in the correct order.
• Error Recovery: Uses acknowledgments and retransmissions to recover lost or corrupted data.
• Flow Control: Prevents the sender from overwhelming the receiver with too much data.
• Congestion Control: Adjusts data transmission rates to reduce network congestion.
• Ordered Data Transfer: Uses sequencing to ensure packets are reassembled in the correct order.
• Widely Supported: Supported across operating systems, browsers, servers, and network infrastructure.
• Suitable for Many Applications: Commonly used for web applications, file transfers, APIs, email, and other applications where reliable delivery is important.

Disadvantages of TCP

• Higher Overhead: Acknowledgments, sequencing, and error recovery require additional network resources.
• Connection Establishment: TCP requires a handshake before data transmission, which can add initial latency.
• Retransmission Delays: Lost packets may need to be retransmitted, increasing delivery time.
• Not Ideal for Real-Time Applications: Delayed packets can be problematic for live video, voice calls, and other latency-sensitive applications.
• Head-of-Line Blocking: A delayed or lost packet can hold up the delivery of subsequent packets.

TCP Vs UDP: A Detailed Comparison

If your streaming content is recorded and made available to the viewers later, such as in the form of VOD, then TCP works well. On the other hand, UDP is typically used for live streaming and multicast video conferencing. Such applications normally require their own protocol (commonly RTP/RTCP over UDP) on top of UDP. 

However, these are not the only things that matter. Here is a detailed comparison between the two technologies.

TCP vs UDP for Streaming: Which One Should You Choose?

There is no universal winner between TCP and UDP. The appropriate choice depends on the requirements of the application. For video-on-demand, HTTP-based delivery remains a common approach because it works effectively with web infrastructure, CDNs, caching, and adaptive streaming technologies.

For live streaming, particularly applications where latency is critical, UDP-based protocols can provide the flexibility required for real-time media transmission. For interactive video, technologies such as WebRTC are designed specifically around low-latency communication.

For professional live contribution, protocols such as SRT can use UDP while adding mechanisms that improve reliability over challenging networks. The important point is that streaming architecture should be selected based on the required combination of latency, reliability, scalability, network conditions, device compatibility, and delivery infrastructure.

Final Comments

Choosing between TCP and UDP is only one part of building a reliable streaming experience. For OTT platforms, the right architecture also needs to account for streaming protocols, content delivery, security, scalability, playback platforms, and monetization.

Muvi Live provides an end-to-end live streaming solution that helps businesses create, manage, and deliver live video across multiple platforms. Instead of building the underlying live streaming infrastructure from scratch, you can use Muvi Live to manage your live broadcasts while focusing on your content and audience.

Get a free 14-day trial to learn more.

Muvi, is also an all-in-one OTT platform provider and stands out from the crowd by ensuring the optimum quality and speed of various forms of video streaming for education, entertainment, corporate video requirements, and many other use cases. Try Muvi One today.