3. Meaning and Usage of GOP Structure Parameters

3.1. Single-Reference P-Frame GOP Structure Description and Usage

singlereferencePframeencodingGOP StructureThe parameters are shown in the following table.

Parameters	Description	Usage Recommendation
s32IPQpDelta	QP difference between I-frames and P-frames	Adjusts I-frame quality and size. A positive value means that the I-frame QP is lower than the P-frame QP. An appropriate difference can reduce breathing effects Recommended value: [2, 6]

3.2. Smart P-Frame GOP Structure Description and Usage

SmartPframeencodingGOP StructureThe parameters are shown in the following table.

Parameters	Description	Usage Recommendation
u32BgInterval	Long-term reference frame interval	Set it to an integer multiple of GOP; 10 to 12 times the frame rate is recommended
s32BgQpDelta	QP difference between a long-term reference frame and a normal P-frame	A positive value means that the IDR-frame QP is lower than the P-frame QP. Recommended value: [4, 6]