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Change video codec error and question

Dear Experts,

We are using DVR_RDK 3.5.

We are trying to change codec from REL. 500.V.H264AVC.E.IVAHD.02.00.04.01 to REL. 500.V.H264AVC.E.IVAHD.02.00.08.00. But we meet problems.

Two Questions:

1) we changed maxPicSizeRatioI=640 to maxPicSizeRatioI=30.

if it set maxPicSizeRatioI=640, error IH264ENC_EXTERROR_RATECTRL_IFRAMEPICSIZE is occurred. Why?

 

2) in codec document,

H264_Encoder_HDVICP2_UserGuide.pdf

REL.500.V.H264AVC.E.IVAHD.02.00.08.00\500.V.H264AVC.E.IVAHD.02.00\IVAHD_001\Docs

section 4-79

                  > If maxPicSizeRatioI is from 2 to 30 maxPicSize = averagePicSize *

                  > maxPicSizeRatioI

                  > If maxPicSizeRatioI is from 33 to 960 maxPicSize =

                  > averagePicSize * maxPicSizeRatioI >> Q5

What is Q5??

Plz help and reply~

thx ~

HB