Screencapturing Event Notification

Last updated: 2023-10-08 14:33:02

Live screencapture takes real-time screenshots from a live stream at the specified interval and stores them in COS. A screencapture callback returns information about stored screenshots, including the screenshot generation time, image size, file path, and download link. To receive screencapture callbacks, you need to configure your server address in a callback template and bind the template with your push domain. When a live screencapture event occurs, the CSS backend will send the screenshot information to the server configured.
This document describes the fields in a live screencapture callback message.
Notes
This document assumes you already know how to configure and receive callbacks.
The information returned by a screencapture callback can be used for porn detection, live video thumbnail generation, and other scenarios.
Screencapture Event Parameters
Event type
Event Type
Value
Live screencapture
event_type = 200
Common callback parameters
Parameter
Type
Description
t
int64
Expiration time, which is the Unix timestamp when the event notification signature expires. 
The default validity period of a message notification from Tencent Cloud is 10 minutes. If the time specified by the `t` value in a message notification has elapsed, then this notification is considered invalid, thereby preventing network replay attacks. 
The value of `t` is a decimal Unix timestamp, that is, the number of seconds that have elapsed since 00:00:00 (UTC/GMT time), January 1, 1970.
sign
string
Security signature. sign = MD5(key + t). Tencent Cloud splices the encryption key and `t`, generates the MD5 hash of the spliced string, and embeds it in callback messages. Your backend server can perform the same calculation when it receives a callback message. If the signature matches, it indicates the message is from Tencent Cloud.
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Note
A key is used for authentication. You can set it in Feature Configuration > Live Stream Callback. We recommend you set it to ensure data security.
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Callback message parameters
Parameter
Type
Description
app
string
Push domain name
appname
string
Push path
stream_param
string
Push URL parameters
stream_id
string
Live stream name
channel_id
string
Same as the stream name
create_time
int64
Unix timestamp when a screenshot is generated
file_size
int
Screenshot file size in bytes
width
int
Screenshot width in pixels
height
int
Screenshot height in pixels
pic_url
string
Screenshot file path (/path/name.jpg)
pic_full_url
string
Screenshot download URL
Sample callback message
{
    "app":"test.app",
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    "appname":"live",
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    "channel_id":"your_channelid",
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    "create_time":1622599925,
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    "event_type":200,
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    "file_size":30670,
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    "height":720,
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    "pic_full_url":"http://your.cos.region.myqcloud.com/channelid/channelid-screenshot-10-12-05-1280x720.jpg",
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    "pic_url":"/channelid/channelid-screenshot-10-12-05-1280x720.jpg",
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    "sign":"ca3e25e5dc17a6f9909a9ae7281e300d",
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    "stream_id":"your_streamid",
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    "stream_param":"txSecret=ca3e25e5dc17a6f9909a9ae7281e300d&txTime=60B83800",
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    "t":1622600525,
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    "width":1280
}
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Screencapturing Event Notification

Notes

Screencapture Event Parameters

Event type

Common callback parameters

Callback message parameters

Sample callback message

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Parameter	Type	Description
t	int64	Expiration time, which is the Unix timestamp when the event notification signature expires. The default validity period of a message notification from Tencent Cloud is 10 minutes. If the time specified by the `t` value in a message notification has elapsed, then this notification is considered invalid, thereby preventing network replay attacks. The value of `t` is a decimal Unix timestamp, that is, the number of seconds that have elapsed since 00:00:00 (UTC/GMT time), January 1, 1970.
sign	string	Security signature. sign = MD5(key + t). Tencent Cloud splices the encryption key and `t`, generates the MD5 hash of the spliced string, and embeds it in callback messages. Your backend server can perform the same calculation when it receives a callback message. If the signature matches, it indicates the message is from Tencent Cloud.

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Recent Pages

Screencapturing Event Notification

Notes

Screencapture Event Parameters

Event type

Common callback parameters

Callback message parameters

Sample callback message

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Was this page helpful?