TDA4VM-Q1: Encoding performance of hardware

Part Number: TDA4VM-Q1
Other Parts Discussed in Thread: TDA4VM

Tool/software:

Hello!

SDK:0901

My requirement is to be able to meet the encoding needs of 4-5 channels with a resolution of 1280 * 960 and FPS>=20. After consulting the platform manual, I found that the performance can meet the requirements. But when I use Gstreame encoding on the TDA4VM platform, with only 4 encoding channels with a resolution of 1280 * 960, the frame rate of the entire Graph is only 18. The frame rate captured by the camera is 25.

Question:How can I solve this problem or How can I improve my encoding performance?