Operators and content providers are constantly seeking ways to enhance content delivery. To meet this increasing demand for personalized, scalable, and flexible content, there is a global shift from multicast to unicast distribution.
For a successful transition, operators need to deploy CDNs (Content Delivery Networks) to efficiently distribute content to viewers. While public CDNs can incur high transfer costs, internal CDNs provide a cost-effective and controllable solution to support operators’ unicast ambitions.
Multicast vs. Unicast: What Drives the Shift?
Let’s clear up the basics before we get into the why.
What Is Multicast?
Multicast is a network-level video transmission method that involves a single video stream of data to multiple recipients simultaneously. One video feed goes out, and multiple users receive it at once. Efficient, predictable, and perfect for managed networks like legacy IPTV.
What Is Unicast?
Unicast broadcast, by contrast, is a one-to-one data transmission model. Every viewer gets their own private stream, tailored in real time. It’s how OTT platforms like Netflix, YouTube, and your average smart TV app deliver content—on demand, over the public internet, and personalized down to the last buffer.
Multicast works beautifully, but only if everyone’s on the same network and watching the same Multicast thing. But the modern viewer is on a phone, a laptop, and smart TVs, and often on the go. Naturally, the shift from multicast to unicast started to happen.
Multicast resembles a cinema experience where many people watch the same picture, while unicast is a one-to-one connection, providing every viewer with their own unique stream.
The shift from multicast to unicast is driven by several factors:
- Increased Demand for Personalized Content
Multicast distribution cannot provide personalized content and is less adaptable to the diverse viewing preferences of modern audiences. Consumers worldwide are seeking on-demand, personalized content – this is where unicast excels. Each user receives an individual stream, allowing content to be tailored to their specific preferences and demands.
- Scalability and Flexibility
Multicast is less flexible and scalable compared to unicast distribution, which can scale based on individual preferences. This model is highly effective and adaptable to changes in user behavior and network conditions. It ensures consistent quality across different devices by integrating with adaptive streaming technologies.
- Technological Advancements
More Americans are abandoning traditional TV every year in favor of streaming services. In 2018, around 30.8 million U.S. households had cut the cord (i.e., dropped traditional cable or satellite TV). By 2024, that number had nearly doubled to 57.6 million.
And it is no coincidence. Continuous technological development and enhancements in internet infrastructure have made unicast delivery more efficient. Higher bandwidth availability and lower latency have improved content distribution and user experience.
Furthermore, improvements in CDN technology, such as edge computing and intelligent caching, have advanced unicast delivery.
- Cost Efficiency
While unicast requires more bandwidth and incurs higher costs compared to multicast, advancements in technology and reduced bandwidth costs make unicast a viable alternative for many operators.
Leveraging internal CDNs can further optimize resource usage and reduce overall costs.Consequently, cost efficiency reflects on consumers too. People are spending more on streaming subscriptions while cutting back on cable bills. Research proves this: SVOD (Subscription Video on Demand) Revenue in the U.S. grew from $14B in 2018 to $43B in 2023, and is projected to hit $56B by 2026. At the same time, Pay TV Revenue declined from $162B in 2018 to $139B in 2024, and is forecast to drop to $135B by 2026.
Comparison Summary: Multicast vs. Unicast
| Feature | Multicast | Unicast |
| Transmission model | One-to-many (single stream to multiple recipients simultaneously) | One-to-one (individual stream per viewer) |
| Best suited for | Linear TV, IPTV, closed networks | OTT streaming, on-demand services, personalized content |
| Personalization | Limited: all viewers receive the same stream | High: multiple receivers (users) with tailored streams and recommendations |
| Network requirements | Requires managed IP networks with multicast routing support | Runs over the public internet; no special routing needed |
| Scalability | Efficient for large, simultaneous audiences (e.g., live TV on same network) | Scalable with CDN support; otherwise bandwidth-intensive |
| Device compatibility | Often limited to set-top boxes or specific endpoints | Compatible with smartphones, tablets, smart TVs, web players, etc. |
| Use cases | Legacy IPTV, enterprise broadcasting | Netflix, YouTube, Hulu, live sports with ad targeting, etc. |
| Monetization potential | Limited; less compatible with modern ad tech (e.g., SSAI, targeted ads) | High; supports dynamic ad insertion, analytics, and viewer-level insights |
To successfully migrate from multicast to unicast distribution, operators need CDNs to ensure efficient and high-quality content delivery to viewers. Public CDNs offer extensive reach and scalability but come with significant transfer costs. This can become expensive with the growth of traffic.
On the other hand, internal CDNs provide a more cost-effective and controllable solution, better supporting unicast ambitions.
Setplex’s Streampool is a cost-effective and infinitely scalable tailored CDN solution for adaptive streaming. It empowers operators with a multi-tenant, fault-tolerant content delivery service for distributing adaptive media streams with ease and reliability.
Streampool’s Main Features
Streampool provides several key benefits:
#1 Enhanced Performance and Reduced Latency
Streampool spots are strategically placed near end-users to enhance the overall user experience. By leveraging user location and service performance metrics, Streampool ensures optimal delivery of HLS, DASH, and CMAF streams. The reduced distance that data needs to travel minimizes latency, ensuring faster load times and a smoother viewing experience.
#2 Infinitely Scalable
Streampool nodes efficiently distribute the load across multiple instances, ensuring a smooth streaming experience. By sharing a common cache repository, these instances minimize resource access operations, enhancing overall performance. The ability to incorporate origin pools and routing rules facilitates seamless load redirection, optimizing network traffic management.
#3 Pay-as-You-Grow
Operators can start with just one Streampool and scale as needed, providing flexibility and cost management. This pay-as-you-grow model allows for efficient scaling aligned with user demand.
#4 Unified OTT Solution
By partnering with Setplex, operators can deploy a fully integrated OTT platform that includes our Nora middleware and Setrix transcoder solutions, alongside Streampool. This integrated approach simplifies deployment and significantly reduces the complexity and costs associated with managing multiple vendors.
Get Started
Interested in discovering how Streampool can revolutionize your content delivery with personalized, scalable solutions?
