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CPU arm_loading on DM8148 is very high

Dear experts,

I am working on DM8148 RDK 3.5. I used demo multich_encode_decode.c in usecase as below picture:

And this usecase work very well. When I check command "top" to know the performance of this usecase as below.

As you can see that it only consumes the small performance of CPU. It really works very well. But when I modify that usecase for my application like below

I have two processes: testRTSPClient process which receives bit stream from network and send those bitstreams to decoder process via UDP socket. Everything work but when i use command "top" and run "arm_loading"  to check performance 

It consumed a big performance of CPU. It's reason make my application just work  for long time or not correct or slowly. After that maybe it dies.

I really try find that reason but still not resolve, so  could somebody please help me. Thanks!

Sincerely yours,