How to adjust the parameters to display colors correctly?

[sgf]

the left is encoded/decoded by OpenH264
the right is draw Raw Image from capture.

you can see the "button2"'s Border Color

I have tried these settings, but they don't seem to work.

    var param = encoder.GetDefaultParameters();

            param.iUsageType = EUsageType.CAMERA_VIDEO_REAL_TIME;
            param.iPicWidth = w; 
            param.iPicHeight = h;
            param.iTargetBitrate = 1000000;
            param.iTemporalLayerNum = 1;
            param.iSpatialLayerNum = 1;
            param.iRCMode = RC_MODES.RC_BITRATE_MODE;

            param.sSpatialLayers[0].iVideoWidth = 0;
            param.sSpatialLayers[0].iVideoWidth = 0;
            param.sSpatialLayers[0].fFrameRate = 60;
            param.sSpatialLayers[0].iSpatialBitrate = 1000000;
            param.sSpatialLayers[0].uiProfileIdc = EProfileIdc.PRO_HIGH;
            param.sSpatialLayers[0].uiLevelIdc = 0;
            param.sSpatialLayers[0].iDLayerQp = 0;
           

            param.iComplexityMode = ECOMPLEXITY_MODE.HIGH_COMPLEXITY;
            param.uiIntraPeriod = 300;
            param.iNumRefFrame = 0;
            param.eSpsPpsIdStrategy = EParameterSetStrategy.SPS_LISTING_AND_PPS_INCREASING;
            param.bPrefixNalAddingCtrl = false;
            param.bEnableSSEI = true;
            param.bSimulcastAVC = false;
            param.iPaddingFlag = 0;
            param.iEntropyCodingModeFlag = 1;
            param.bEnableFrameSkip = false;
            param.iMaxBitrate =0;
            param.iMinQp = 0;
            param.iMaxQp = 51;
            param.uiMaxNalSize = 0;
            param.bEnableLongTermReference = true;
            param.iLTRRefNum = 1;
            param.iLtrMarkPeriod = 180;
            param.iMultipleThreadIdc = 1;
            param.bUseLoadBalancing = true;
            
            param.bEnableDenoise = false;
            param.bEnableBackgroundDetection = true;
            param.bEnableAdaptiveQuant = true;
            param.bEnableSceneChangeDetect = true;
            param.bIsLosslessLink = false;
            param.bFixRCOverShoot = true;
            param.iIdrBitrateRatio = 400;
            param.fMaxFrameRate = 30;

openh264 version 2.4.1