How Tencent Cloud’s Ultra‑Low‑Latency Live Streaming Redefined Real‑Time Video

China’s video‑centric live streaming practices are leading a global trend, with companies like Amazon and Wayfair launching their own live commerce platforms.

While business models can be imitated, the underlying technology innovations require sustained effort.

One critical technology behind popular influencer live‑shopping rooms is ultra‑low‑latency streaming, which demands millisecond‑level delay, strict first‑frame, stutter, and successful start‑up metrics—capabilities that only a few international vendors can provide.

In this arena, Tencent Cloud has quietly taken a leading position.

Live Streaming Is Hot, Cloud Providers Struggle

The pandemic opened the door to a nationwide live streaming era, spanning online classrooms, e‑commerce, and concerts.

Behind the scenes, cloud providers face a stark contrast: while streamers earn millions, cloud vendors grapple with thin margins and intense price wars.

Market growth is slowing, and cloud providers’ profits are eroding due to aggressive pricing, even as demand for large‑scale, low‑latency interactive streams surges.

Faced with this dilemma, providers must choose between continued price cuts or investing in technical innovation that meets real‑world scenario needs.

Tencent Cloud’s audio‑video team opted for the latter, embarking on a journey to combine RTC technology with traditional streaming advantages.

Starting in late 2019, the team conducted market research and user‑need analysis, discovering that standard live streaming could handle high concurrency but suffered from excessive interaction latency.

The solution involved adopting the open WebRTC protocol, redesigning the streaming architecture, and creating “Tencent Cloud Fast Live,” a product delivering ultra‑low‑latency experiences.

Engineers replaced the traditional broadcast‑control model with a WebRTC‑based feedback loop, dynamically adjusting buffering and transmission strategies based on network conditions to optimize user experience.

Performance improvements include reduced latency, fewer stalls, and faster first‑screen rendering, delivering comprehensive value to customers.

To keep the SDK lightweight (targeting <500KB), the team performed extensive code trimming, multi‑IP backup, UDP/TCP dual‑channel racing, and Wi‑Fi/4G switching, preserving QoS while shrinking size.

These optimizations enabled seamless integration for B‑side clients, offering either a dedicated transmission‑layer SDK for self‑developed players or a standardized WebRTC optimization package.

Innovations such as seamless bitrate switching based on network conditions and WebRTC support for AV1 encoding set industry firsts.

During the 2020 pandemic, the team rapidly launched a large‑scale public beta, securing the first major customer, XiaoE‑Tong, and later expanding to education and entertainment clients.

Through close collaboration with internal teams like Penguin E‑Sports and Tencent Classroom, the product proved its technical robustness and market competitiveness.

Since its full release in May 2021, Fast Live’s daily bandwidth peaks have continuously broken records, with hundreds of customers—including leading e‑commerce, entertainment, and education platforms—adopting the solution.

Looking ahead, video technology will advance toward ultra‑HD, ultra‑low latency, immersive, and highly interactive experiences, driven by 5G’s bandwidth expansion and new use cases such as cloud gaming, VR/AR, IoT, and autonomous driving.

Tencent Cloud Fast Live is poised to spearhead this “infinite battle” of the fully connected internet era.