- Release Notes and Announcements
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- Announcement on the Official Launch of the VOD Scene Transcoding Feature
- Announcement about the addition of mobile player SDK premium features authorization verification
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- Notice about the adjustment of the VOD adding domain feature
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- Cost Allocation by Tag Supported
- Content Moderation Upgraded
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- Live Clipping to Become Paid Feature
- Content Recognition to Become Paid Feature
- The “startPlay” API of the Player SDK Renamed
- TESHD Renamed as TSC
- Announcement on VOD Video Acceleration Price Change
- Launching Video on Demand (VOD) Features for Regions Outside the Chinese Mainland
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- CreateWatermarkTemplate
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- DescribeTranscodeTemplates
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- DescribeSnapshotByTimeOffsetTemplates
- DescribeSampleSnapshotTemplates
- DescribeImageSpriteTemplates
- DescribeAnimatedGraphicsTemplates
- DescribeAdaptiveDynamicStreamingTemplates
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- DescribeAIAnalysisTemplates
- DeleteTranscodeTemplate
- DeleteWatermarkTemplate
- DeleteSnapshotByTimeOffsetTemplate
- DeleteSampleSnapshotTemplate
- DeleteImageSpriteTemplate
- DeleteAnimatedGraphicsTemplate
- DeleteAdaptiveDynamicStreamingTemplate
- DeleteReviewTemplate
- DeleteAIRecognitionTemplate
- DeleteAIAnalysisTemplate
- DeleteHeadTailTemplate
- DeleteImageProcessingTemplate
- DescribeReviewTemplates
- CreateReviewTemplate
- CreateTranscodeTemplate
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- ModifyTranscodeTemplate
- CreateAIRecognitionTemplate
- CreateHeadTailTemplate
- CreateImageProcessingTemplate
- DescribeHeadTailTemplates
- DescribeImageProcessingTemplates
- ModifyHeadTailTemplate
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- Task Flow APIs
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- Domain Name Management APIs
- Playlist APIs
- Data Types
- Error Codes
- FAQs
- Agreements
- VOD Policy
- Contact Us
- Glossary
- Release Notes and Announcements
- Release Notes
- Announcements
- Announcement on the Official Launch of the VOD Scene Transcoding Feature
- Announcement about the addition of mobile player SDK premium features authorization verification
- Announcement about the addition of web player SDK license authorization verification
- Announcement on the Official Launch of the Video on Demand Real-Time Log Analysis Feature
- Notice about the adjustment of the VOD adding domain feature
- Announcement on official commercial billing of Video on Demand STANDARD_IA data retrieval and Application Management functions
- Announcement on the Official Launch of the Media Quality Inspection and Play Channel Features
- Announcement on the official launch of the Video-on-Demand QUIC Acceleration feature
- VOD Launched Remaster Feature
- Prepaid Packages Supported for Monthly Billed Accounts
- Cost Allocation by Tag Supported
- Content Moderation Upgraded
- VOD Player Signature Upgrade
- Live Clipping to Become Paid Feature
- Content Recognition to Become Paid Feature
- The “startPlay” API of the Player SDK Renamed
- TESHD Renamed as TSC
- Announcement on VOD Video Acceleration Price Change
- Launching Video on Demand (VOD) Features for Regions Outside the Chinese Mainland
- About Changing the Billing Rule of Transcoding Service for VOD/MPS
- Product Introduction
- Purchase Guide
- Getting Started
- Console Guide
- Console Overview
- Service Overview
- Application Management
- Media Management
- Package Management
- License Management
- Real-Time Log Analysis
- Practical Tutorial
- Media Upload
- Smart Cold Storage of VOD Media Asset Files
- Video Processing
- Distribution and Playback
- How to Receive Event Notification
- How to Migrate Files from Origin Server to VOD
- Live Recording
- How to Make VOD Videos Live Streaming-Like
- Using VOD and WordPress to Build a Website
- How to Pull from Custom Origin Servers
- Development Guide
- Player SDK
- Server APIs
- History
- Introduction
- API Category
- Other APIs
- Media processing related API
- No longer recommended APIs
- Task Management APIs
- Media Upload APIs
- Media Management APIs
- Media Categorization APIs
- Distribution APIs
- AI-based Sample Management APIs
- Region Management APIs
- Statistics APIs
- Just In Time Transcode APIs
- Making API Requests
- AI-based image processing APIs
- Parameter Template APIs
- CreateWatermarkTemplate
- CreateSnapshotByTimeOffsetTemplate
- CreateSampleSnapshotTemplate
- CreateImageSpriteTemplate
- CreateAnimatedGraphicsTemplate
- CreateAdaptiveDynamicStreamingTemplate
- CreateAIAnalysisTemplate
- ModifyWatermarkTemplate
- ModifySnapshotByTimeOffsetTemplate
- ModifySampleSnapshotTemplate
- ModifyImageSpriteTemplate
- ModifyAnimatedGraphicsTemplate
- ModifyAdaptiveDynamicStreamingTemplate
- ModifyAIRecognitionTemplate
- ModifyAIAnalysisTemplate
- DescribeTranscodeTemplates
- DescribeWatermarkTemplates
- DescribeSnapshotByTimeOffsetTemplates
- DescribeSampleSnapshotTemplates
- DescribeImageSpriteTemplates
- DescribeAnimatedGraphicsTemplates
- DescribeAdaptiveDynamicStreamingTemplates
- DescribeAIRecognitionTemplates
- DescribeAIAnalysisTemplates
- DeleteTranscodeTemplate
- DeleteWatermarkTemplate
- DeleteSnapshotByTimeOffsetTemplate
- DeleteSampleSnapshotTemplate
- DeleteImageSpriteTemplate
- DeleteAnimatedGraphicsTemplate
- DeleteAdaptiveDynamicStreamingTemplate
- DeleteReviewTemplate
- DeleteAIRecognitionTemplate
- DeleteAIAnalysisTemplate
- DeleteHeadTailTemplate
- DeleteImageProcessingTemplate
- DescribeReviewTemplates
- CreateReviewTemplate
- CreateTranscodeTemplate
- ModifyReviewTemplate
- ModifyTranscodeTemplate
- CreateAIRecognitionTemplate
- CreateHeadTailTemplate
- CreateImageProcessingTemplate
- DescribeHeadTailTemplates
- DescribeImageProcessingTemplates
- ModifyHeadTailTemplate
- CreateQualityInspectTemplate
- DeleteQualityInspectTemplate
- DescribeQualityInspectTemplates
- ModifyQualityInspectTemplate
- CreateEnhanceMediaTemplate
- DeleteEnhanceMediaTemplate
- ModifyEnhanceMediaTemplate
- DescribeEnhanceMediaTemplates
- Task Flow APIs
- Event Notification Relevant API
- Domain Name Management APIs
- Playlist APIs
- Data Types
- Error Codes
- FAQs
- Agreements
- VOD Policy
- Contact Us
- Glossary
TCPlayer Swift Live Streaming Downgrade Notice
Last updated: 2024-05-13 17:49:25
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.
Operating System | OS Version | Browser | Browser Version | Support for Stream Pull |
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);});
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