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how to get that each frame interval is 40ms when fps is 25 in link demo on dm8168 rdk

Hi all,

I  refer to  dm8168 rdk to develop encoder,  I select  function chains_multiChDucatiSystemUseCaseSwMsTriDisplay1 as my  develop reference,  which is located at /dvr_rdk/demos/link_api_demos/vpss_video_chains/chains_multiChDucatiSystemUseCaseSwMs1_TriDisplay.c 

I get 4 frames every   time by callbck Chains_ipcBitsRecvFxn, But i want to get  a frame by callback function, and each frame interal is 40ms when fps is 25