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dm8168 dvrrdk4.1. can modify the encode pameraters let the IDR frame have larget bitrate.

Have any method can resolve this problem?Hi all

   I use dm8168evm dvrrdk4.1 . 

   In our program need canpture 1080P25 picture to deal then do encode.

   the scene of our camera is almost unchanged, so I configure a 2M bitrate. now find a problem.

   the idr frame have very low bitrate,so the  I frame is poor quality . but the P frame is good quality, so when display the encode bitstream,  can feel very apparent quality change every second.

   Have any method can resolve this problem?