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- Glossary
- Updates and Announcements
- User Tutorial
- Product Introduction
- Purchase Guide
- Getting Started
- Configuration Guide
- Permission Management
- Use Cases
- Best Practice
- API Documentation
- FAQ
- Troubleshooting Methods
- CDN Service Level Agreement
- Glossary
Overview
- Video dragging generally happens in VOD scenarios. When a user drags the video progress bar, a request similar to the one as shown below will be sent to the server:
http://www.test.com/test.flv?start=10
In this case, data will be returned starting from the 10th byte. Video files in VOD scenarios are all cached on various CDN nodes; therefore, the nodes can directly respond to such requests once this configuration is enabled. - The Ignore Query String configuration should be enabled for video dragging. That is, the Ignore Query String of all rules in [Cache Key Rule Configuration(https://www.tencentcloud.com/document/product/228/35316) should be configured as "Ignore All", and the origin server should support Range requests. Supported file formats are MP4, FLV, and TS.
| File Type | Meta Information | Parameter Description (start) | Request Sample |
|---|---|---|---|
| MP4 | For a video on the origin server, the meta information must be located in the file header. Videos with meta information located at the file end are not supported. | The parameter start specifies a time point (in seconds) and uses a decimal to specify a millisecond. For example, "start = 1.01" means that the start time is at 1.01s. CDN will locate the last keyframe before the time specified by start if start is not a keyframe. |
http://www.test.com/demo.mp4?start=10 indicates that the video will be played back starting from the 10th second. |
| FLV | The video on the origin server must have meta information. | The parameter start specifies a byte. CDN will automatically locate the last keyframe before the byte specified by start if start is not a keyframe. |
http://www.test.com/demo.flv?start=10 indicates that the video will be played back starting from the 10th byte. |
| TS | – | The start parameter defines a start byte. CDN will automatically locate the beginning byte. |
http://www.test.com/demo.ts?start=10 indicates that the video is played from the 10th byte. |
Viewing the Configuration
Log in to the CDN console, select Domain Management on the left sidebar, and click a streaming VOD acceleration domain name to enter the configuration page. Open the Access Control tab to find the Video Dragging section. Video dragging is disabled by default.
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