Recording and Replay

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LEB Playback

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V2TXLivePusher

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Mobile Live Video Broadcasting

The recording and playback features allow you to record live streams and play them to users on demand.

Your application may have a relatively small number of hosts at the early stage. Playback can enrich the content your application provides to audience at this stage. Even after your hosts grow to a considerable scale, having a library of high-quality content is still essential. Videos of past streams also make up an important part of a host’s profile.

The recording and playback features are built on Tencent Cloud's 

. Therefore, to use the recording feature, you need to activate 

https://console.tencentcloud.com/vod

 in the console. After that, you can find recorded videos in 

http://console.tencentcloud.com/vod/media

Follow the steps below to enable the recording feature.

You can record live streams using an API. For more information, see 

https://intl.cloud.tencent.com/document/product/267/37309

Recorded videos are automatically stored in the VOD platform. Therefore, to use the recording feature, you need to activate VOD and purchase storage and traffic packages to store and play back recorded videos. For more information, see 

https://intl.cloud.tencent.com/document/product/266/8757

https://console.tencentcloud.com/live/config/record

. For detailed instructions, please see the "Creating a Recording Template" section in 

https://intl.cloud.tencent.com/document/product/267/34223

After creating a recording template, in the CSS console, select 

https://console.tencentcloud.com/live/domainmanage

, click a publishing domain to go to the details page, select 

 section to bind the domain name to the template created, and click 

https://intl.cloud.tencent.com/document/product/267/34224

Playback URLs are generated for new recording files. You can use them to enable various additional features for your application based on your business needs.

For example, you can add the playback URLs of a host’s past live streams to his or her profile. You can also select high-quality content from past live streams and recommend it to your users in a playback list.

There are two methods to get recording files.

Register a callback URL on your server and provide it when 

https://intl.cloud.tencent.com/document/product/267/31074

 with Tencent Cloud. Tencent Cloud will notify you of the generation of new recording files via the URL.

https://console.tencentcloud.com/live/config/callback

, fill in the callback information, and click 

https://intl.cloud.tencent.com/document/product/267/31074#Callback


After creating a callback template, select 

, click a publishing domain name to go to the details page, select 


Below is a typical notification message. It indicates that a new FLV recording file with the ID 

 has been generated, and the playback URL is 

http://200025724.vod.myqcloud.com/200025724_ac92b781a22c4a3e937c9e61c2624af7.f0.flv

    "sign": "fef79a097458ed80b5f5574cbc13e1fd",

    "video_id": "200025724_ac92b781a22c4a3e937c9e61c2624af7",

    "video_url": "http://200025724.vod.myqcloud.com/200025724_ac92b781a22c4a3e937c9e61c2624af7.f0.flv"

Method 2: querying in the console or via an API

Recording files are saved automatically in the VOD system after generation. You can view recording files in the VOD console or query files using a VOD API. For details, please see 

https://intl.cloud.tencent.com/document/product/267/31563


After you enable recording for a live stream, each audio/video frame published from the host’s mobile phone will be relayed to the recording system and written into a recording file.

When a live stream is interrupted, the access layer will immediately ask the recording server to wrap up the writing process, save the file generated to the VOD system, and generate an index for the file. You can then find the recording file in the VOD system. If you have configured recording callback, the recording system will send the 

If a file is too large, errors may occur while the file is being transferred and processed in the cloud. As a result, to ensure the success of recording, we have capped the duration of a single recording file at 120 minutes. You can record shorter video segments by setting the 

2. How many recording files does a live stream generate?

: the duration of a single file ranges from 1 to 120 minutes. You can specify a shorter segment using the 

https://intl.cloud.tencent.com/document/product/267/30845

If a live stream is so short that it ends before the recording module is started, no recording files will be generated.

 and is not interrupted, only one recording file will be generated.

, the stream will be segmented based on the duration specified by 

. The purpose of this is to reduce the uncertainty of a file’s transfer time in a distributed system.

If a live stream is interrupted and resumed, a new video segment will be generated each time an interruption occurs.

 There is no upper limit on the duration of recording files. If a live stream is interrupted and the timeout period for breakpoint resumption (which can be set to 0-1800s) elapses, a new recording file will be generated to continue recording.

3. How do I know which live stream a recording file belongs to?

Tencent Cloud as a PaaS provider does not really know how you define a live stream. Assume that a host streamed for 20 minutes, but the process was interrupted twice, once due to network change and once manually by the host. Is it one live stream or three?

In most mobile live streaming scenarios, we consider the period between the two time points below as a live stream.


If you use the above standard, the time information provided by your application is important. To determine which live stream a recording file belongs to, just search for the recording notification received by live stream code and time. Each recording notification carries information including stream ID, start time, and end time.

You can splice video segments using a cloud API.

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