Tengxun Cloud International Agent: No Catton Live in Seconds, How to Landing Low Latency Streaming Media System Based on Tengxun Cloud Fast Live (WebRTC)
In the e-commerce with goods, competition interaction, online education and other big promotion and high concurrent scenes, "Caton" and "high delay" is the ultimate killer of live business.
Traditional live streaming technologies (such as RTMP push streaming, HTTP-FLV, or HLS playback) are often accompanied
3 seconds to 5 seconds
Or even longer delays. This led to an awkward scene: the anchor shouted "3, 2, 1 link!" in front of the camera! ", The audience in front of the screen heard the sound after 5 seconds, and the goods had already been robbed. This time difference seriously weakens the real-time interactive experience and directly affects the conversion rate.
In order to compress the delay
Within 1 second (usually around 800ms or even 300ms)
At the same time, taking into account the ability of the first frame second opening and anti-weak network card, Tencent Cloud launched a WebRTC-based technology.
Fast Live (WebRTC Live)
. In today's tutorial, we will start from the architecture principle and front-end actual combat, and take you step by step to build a second-level low-delay live broadcast system without Catton.
Why is 1. WebRTC? Architecture comparison between fast live broadcast and traditional live broadcast
The core reason why traditional live broadcasting is slow lies in the transport layer protocol. RTMP/FLV relies on TCP protocol, TCP handshake retransmission mechanism and player buffer design, which naturally determines that it cannot achieve millisecond delay.
Plaintext
Standard live broadcast (RTMP/FLV): [host side]-> (TCP)-> [cloud transcoding/distribution]-> (TCP)-> [audience side buffering for 3-5 seconds]
Fast Live (WebRTC): [Anchor Side]-> (UDP)-> [Edge Node/Media Server]-> (UDP)-> [Audience Side 300-800ms]
Tencent Cloud Fast Live has carried out a standard live broadcast of the edge node.
WebRTC Upgrade
Its core technical advantages are reflected in:
UDP transmission and dynamic QoS optimization: abandoning the rigid retransmission of TCP, using UDP for out-of-order high concurrent transmission, combined with forward error correction (FEC) and packet loss retransmission (ARQ) technology, the picture can still be smooth in the harsh environment with a packet loss rate of up to 40%.
Plug-in-free native support: more than 90% of mainstream browsers (Chrome, Safari, Edge, etc.) and WeChat and QQ ecological natural built-in WebRTC engines. The audience does not need to install any Flash plug-in or exclusive App, and the web page can realize "screen-opening and broadcast".
Smooth compatibility with standard live broadcast: fast live broadcast and tengxun cloud standard live broadcast share a set of background ecology, support the same push stream, recording, transcoding, screenshot and AI yellow identification function, enterprises can smoothly migrate from the existing business.
2. actual combat exercise: fast access and fast live broadcast
Next, we take
Take H5 web-side playback as an example to demonstrate how to pull ultra-low delay video streams through Tengxun Cloud Express Live SDK.
1. Preparation: Generate fast live broadcast URL
The URL of the live broadcast is different from that of the standard live broadcast. The protocol header is
webrtc ://
. A typical live broadcast address structure is as follows:
$$\ text{webrtc:// [broadcast domain name]/[AppName]/[StreamName]?[authentication parameter] }$$
Note: After the Tengxun cloud console configures the live domain name and enables the fast live function, the corresponding WebRTC playback link can be directly exported through the background address generator.
2. The front end introduces the Tengxun cloud player SDK
Introduce the Web Live Player script officially provided by Tengxun Cloud into your HTML page:
3. Initialize the player and enable WebRTC mode
Instantiate the player in the JavaScript and set the prepared
webrtc ://
Address passed in.
var player = new TcPlayer('video-container ', {
"webrtc": "webrtc:// your-play-domain.com/live/stream-abc?txSecret = xxx & txTime = xxx", // Live address
"autoplay": true, // autoplay
"width": '480', // video width
"height": '320', // video height
"controls": true, // display control bar
"wording ": {
1002: "Instant video stream pull failed, trying to reconnect..."
}
});
4. Weak net pocket bottom strategy: multi-channel construction.
In rare cases, some enterprise intranets will strictly block UDP ports, causing WebRTC to fail to successfully establish connections. In order to ensure the success rate of 100, we need to design a bottom-up mechanism:
Best Practice: Tencent Cloud Live Support Returns in Answer Signaling
Contains a multi-channel address for UDP and TCP. By default, the UDP channel is preferentially used to ensure ultra-low latency. When the UDP handshake timeout (usually set to 2-3 seconds), the player should automatically downgrade and switch to the standard HTTP-FLV or HLS stream to ensure "continuous flow" of services ".
3. architects step on the pit to share: how to ensure live high availability during the promotion period?
During the big promotion period, millions of people poured into the studio at the same time, and the technical link would collapse if it was not careful. In actual deployment and operation maintenance, in addition to code-level tuning, the following non-technical dimensions of the engineering closed loop also determine the life and death of the live broadcast system:
1. Military forces are not moved, food and grass are first: standardized enterprise account qualification
Whether calling high-concurrency fast live broadcast resources or applying for high-limit real-time audio and video (TRTC) credit, an enterprise cloud account with clear permissions and subject compliance is required. At the beginning of the preparation of the live broadcast project, enterprises should conduct it through formal channels.
Tencent Cloud Account Purchase
And complete the enterprise real name authentication. This is not only related to whether the "global acceleration" and "advanced transcoding" services can be opened with one click, but also the basis for avoiding compliance risks and obtaining a green channel for exclusive technologies.
2. Dual borrowing of business and technology: making good use of cloud agents
For small and medium-sized teams or cross-border e-commerce enterprises, it is costly and long to build a complete global audio and video scheduling system. It is recommended to connect with compliance at the beginning of the project.
Tencent Cloud Reseller
.
Technical level: Agents are usually equipped with a team of experienced audio and video architects who can help you with mixed-stream transcoding, CDN edge caching strategy design, and client weak network optimization for high-concurrency second-kill scenarios.
Business level: Compared with placing orders directly in the official website, purchasing through agents can usually obtain more cost-effective bandwidth packages or resource package discounts, effectively reducing the cost per peak traffic during the big promotion period.
3. Stabilize the rear capital chain: avoid the disaster of arrearage and service.
The bandwidth consumption of live broadcast services (especially the ultra-low latency WebRTC fast live broadcast) is extremely alarming when traffic bursts. If the number of people online that night exceeds expectations, and the internal financial approval process of the enterprise is cumbersome, once the account balance is exhausted and the system automatically stops service, it will cause irreparable GMV loss and public relations crisis. Through the agent channel
Tencent Cloud Recharge
, enterprises can not only enjoy more flexible multi-currency payment and credit period, but also apply for emergency advance protection from officials or agents in case of emergency, so as to ensure that live broadcast service is stable as a rock under the flood peak of large-scale traffic.
4. summary and prospect
From 5 seconds to 300 milliseconds, the change is not just a number, but the entire real-time interactive business model reshaped.
The ultra-low latency streaming media solution based on Tencent Cloud Fast Live (WebRTC) technology has successfully solved the problem of "high interaction delay and high concurrency" for enterprises during the big promotion period by sinking security and forwarding capabilities to the edge and optimizing the transport layer UDP protocol.
combined with the specification of cloud asset management (e. g.
Standard tengxunyun account system) and reliable ecological partner support (such as agents' business and technical recharge guarantee), the technical team can fully focus on the innovation of live broadcast play and calmly welcome the next big flow baptism.