When using the Intel Ultra processor core graphics (QuickSync HEVC), the encoder settings - the bit rate control is set to variable bit rate, and then the bit rate and the maximum bit rate are set. During the recording process, the frame rate basically matches the bit rate I have set, even in complex scenes. The maximum bit rate has almost no effect, as if it were just a dummy. With the NVIDIA graphics card (NVIDIA NVENC HEVC), the variable bit rate setting is used to set the bit rate and the maximum bit rate, and during recording, the bit rate will change according to the scene.