The Difference Between Fixed Bit Rate And Variable Bit Rate Of Network Camera

Generally, when we output a video file, we will encounter a choice, namely CBR and VBR. The full English name of CBR is Constant Bit Rate, which translates to a fixed bit rate, which means that every second of the picture is regarded as a still picture file. (Actually, the size of each frame is added up) Its size is fixed. The English full name of VBR is Variable Bit Rate, which means that the main variable bit rate means that the size of the screen per second is not fixed. So what is the difference between the fixed bit rate and the variable bit rate of the network camera?

The difference between fixed bit rate and variable bit rate:

1. Generally speaking, the overall picture quality of variable bit rate is better, and the compression speed of fixed bit rate is faster. However, if the bit rate is not suitable for large dynamic pictures, the picture will be unclear. The variable bit rate will use different bit rates according to the dynamics of the picture. Ensure the clarity of large dynamic pictures, but the compression time will increase sharply.

2. The fixed bit rate equipment uses a fixed bit rate value to record. When the variable bit rate is not obvious when the scene in front of the lens changes, use a lower bit rate to encode, which saves recording space.

3. It is most effective to use a fixed bit rate in a streaming program. In recent years, a dynamic bit rate has been widely used in video encoding processing.

Relevant content is introduced here first. When a specific image quality is specified for a network camera, the fixed bit rate will not have much picture changes. Regardless of the amount of picture information, a fixed value is used for compression, so it takes up space Big. When the variable bit rate detects a large number of static images, it will only compress the dynamic change area, and the image will remain the last frame of image statically, and the image quality will drop a little when the image changes drastically.