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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