In the Bit Rate Type list, select CBR (Constant Bit Rate) or VBR(Variable Bit Rate). If you select CBR, the image quality cannot be configured; if you select VBR, the image quality can be configured.
Select Main menu>Camera>Encode.
Select Bit Rate Type .System Display Bit Rate Type Interface.
Click the drop-down menu to select CBR/VBR.
CBR: It is recommended to choose fixed bit stream when the scene changes little.
VBR: Variable bit stream is recommended when the scene changes greatly.