Downgrade Scenarios
Live Event Broadcasting (LEB) relies on WebRTC technology, requiring both the operating system and browser to support WebRTC.
Currently, the SDK has been tested on the following operating systems and browsers, with the test results as follows.
|
Windows | Windows 10 | Chrome | 86+ | ✓ |
|
| Firefox | 88+ | ✓ |
|
| Microsoft Edge | 86+ | ✓ |
macOS | 10.5+ | Safari | 13.1+ | ✓ |
|
| Chrome | 86+ | ✓ |
|
| Firefox | 88+ | ✓ |
|
| Microsoft Edge | 86+ | ✓ |
iOS | 13.1.1+ | Safari | 13.7+ | ✓ |
|
| Chrome | 86+ | ✓ |
|
| Firefox | 33+ | ✓ |
|
| Microsoft Edge | 89 | ✓ |
|
| WeChat embedded | - | ✓ |
Android | - | Chrome | 86+ | ✓ |
|
| Firefox | 88+ | ✓ |
|
| WeChat embedded | X5 kernel | ✓ |
|
| WeChat embedded | XWeb kernel | ✓ |
Additionally, in some browsers that support WebRTC, there may be decoding failures or server-side issues. In these cases, the player will convert the WebRTC URL to a more compatible HLS URL for playback. This behavior is known as downgrade processing.
To summarize, there are several scenarios that trigger downgrading:
The browser environment does not support WebRTC.
Failed to connect to the server, and the number of retries has exceeded the preset value (internal status code -2004).
Failed to decode during playback (internal status code -2005).
Other WebRTC-related errors (internal status code -2001).
Downgrade Methods
1. Automatic Downgrade
During player initialization, the LEB URL is received through the sources field. In environments requiring downgrade processing, the player automatically converts the LEB URL to the HLS URL.
For example, the LEB URL
webrtc://global-lebtest-play.myqcloud.com/live/lebtest?txSecret=f22a813b284137ed10d3259a7b5c224b&txTime=69f1eb8c
will automatically convert to:
https://global-lebtest-play.myqcloud.com/live/lebtest.m3u8?txSecret=f22a813b284137ed10d3259a7b5c224b&txTime=69f1eb8c
2. Specified Downgrade
In ABR playback scenarios, downgrade processing requires manually specifying an HLS URL. Direct format conversion is not supported. This method can also be used for scenarios where users require manual configuration of downgrade URLs, and it is compatible with protocols beyond HLS.
var player = TCPlayer('player-container-id',{
sources: 'webrtc://global-lebtest-play.myqcloud.com/live/lebtest?txSecret=f22a813b284137ed10d3259a7b5c224b&txTime=69f1eb8c&tabr_bitrates=d1080p,d540p,d360p&tabr_start_bitrate=d1080p',
webrtcConfig: {
fallbackUrl: 'https://global-lebtest-play.myqcloud.com/live/lebtest_HLSABR.m3u8',
},
});
Downgrade Callback
When a downgrade is triggered, the player will initiate a callback.
player.on('webrtcfallback', function(event) {
console.log(event);
});