How two change encode framerate？

Hi，I use DVRRDK 03.00.00.00 for development. Hardware platform is EVM8168.

My code is used for test encode performance.

read raw data from files(interlace data) --> IpcFramesOutHLOS --> IpcFramesInVideoM3 -->Enc -->IpcBitsOutVideoM3 --> IpcBitsInHLOS --->save bits to files.

however, no matter which data i set for inputframerate, the encoded data always 30fps.

I also change the frames rate send to Encode(very slow), the encoded data always 30fps.

I read encode link codec, can't find which place set the 30fps encode, all place i printf showes that the framerate is 25fps, which is equal to what i set.

Can somebody help me?