[parameter configuration tutorial] how should the parameters in the RTMP streaming camera be configured?

TSINGSEE The development of Qingxi video RTMP Streaming cameras have been recognized by many users , Because the configuration of the camera is directly related to the clarity and smoothness of the video , Mismatched configurations may cause blurring or jamming of the video , So many users use it , There is still some confusion about the configuration parameters in the camera , So in this paper, we will uniformly describe the related parameter problems , Take a look at how to realize device access in combination with specific camera parameters .

Set in the surveillance camera menu , The higher the resolution and decoding rate 、 The better the image quality 、 The bigger the file , Multiple frames make the video image stable . General general 25 Frame like this , The code rate interval is not set .

In the webcam （IPC） In the parameter setting of , About the following parameter settings , Many users may not know the specific meaning of these parameters . Let's talk about some common parameters （ Coding mode 、 The resolution of the 、 Frame rate 、 Bitstream control 、I Frame interval, etc ） Explain what it means .

One 、 Coding mode （CODING MODE）：

• H.264
• H.264 Is the MPEG-1、MPEG-2 and MPEG-4 After a highly compressed video codec standard , Compression efficiency ratio under the same graphics quality MPEG-2 Improved 2 times .
• H.265
• H.265 yes ITU-T VCEG Following H.264 After that, the new video coding standard was established , Improve the code stream based on the original standard 、 Coding quality 、 The relationship between delay and algorithm complexity , Make coding optimal .
• MJPEG
• Montion Joint Photographic Experts Group, Moving still image （ Or frame by frame ） compression technique .
• MPEG-4
• MPEG-4 yes MPEG-2 Format of development , Used to transmit video data at low speed .
• SVAC
• Technical standard for preventing and monitoring digital video and audio codec （Surveillance Video and Audio Coding）, It is a technical standard to solve the unique requirements of the security monitoring industry .

Two 、 The resolution of the （RESOLUTION）

Resolution includes display resolution and image resolution . Display resolution refers to the number of display pixels per unit area ; Image resolution refers to the amount of information stored in an image , It's the number of pixels per inch of the image .

• D1
• D1 It is the standard of digital TV system display format .
• 720P
• 720P Is achieved by progressive scanning 1280×720 The resolution of the display format . Numbers 720 It means that there is... In the vertical direction 720 Horizontal scan lines , Letter P（Progressive scan） Indicates progressive scanning .
• 960P
• 960P Is achieved by progressive scanning 1280×960 The resolution of the display format . Numbers 960 It means that there is... In the vertical direction 960 Horizontal scan lines , Letter P（Progressive scan） Indicates progressive scanning .
• 1080P
• 1080P Is achieved by progressive scanning 1920×1080 The resolution of the display format . Numbers 1080 It means that there is... In the vertical direction 1080 Horizontal scan lines , Letter P（Progressive scan） Indicates progressive scanning .

In general , We have no general requirements for resolution , Generally, the user-defined resolution is selected according to the actual site of the equipment . The usual recommendation is 1080P.

3、 ... and 、 Frame rate （FRAME RATE）

Frames displayed per second （Frames per Second）, Describe the update frequency of the video stream , The unit is FPS or Hz.

Generally in practical application , Per second 25 The frame can meet the demand .

Four 、 Bitstream control （BITSTREAM CONTROL）

When the code stream control mode is variable code stream , The camera adjusts the video stream in real time according to the network bandwidth , Ensure the normal display of the video picture when the network bandwidth is insufficient .

In the actual access process , The fixed code rate is relative to the coding rate , The effect will be better .

5、 ... and 、I Frame spacing （IFRAME INTERVAL）

Two I The number of frames between frames ,I Frames are also called keyframes , Information used to record the entire image . The greater the numerical , The smaller the storage space occupied by the compressed video .

In general, a key frame every second or every two seconds can meet the normal live broadcast requirements .