Question about mosaic parameter setting of software rdk 01.06.00.11

Hi,

I have an question In the mcfw software RDK 01.06.00.11.

In the swMs link creating parameter as following,

    for(i=0; i<gVsysModuleContext.vsysConfig.numDisplays; i++)
    {
        swMsPrm[i].inQueParams.prevLinkId     = gMultiCh_VdecVdisObj.dup1Id;
        swMsPrm[i].inQueParams.prevLinkQueId  = i;
        swMsPrm[i].outQueParams.nextLink      = gVdisModuleContext.displayId[i];
        swMsPrm[i].maxInputQueLen             = SYSTEM_SW_MS_INVALID_INPUT_QUE_LEN;
        swMsPrm[i].timerPeriod                = 30;
        swMsPrm[i].maxOutRes                  = displayRes[i];
        /* low cost line skip mode of scaling can be used, when tiler is off */
        swMsPrm[i].lineSkipMode = FALSE;
        MultiCh_swMsGetDefaultLayoutPrm(i, &swMsPrm[i], FALSE);    /* both from 0-16 chnl */

        displayPrm[i].inQueParams.prevLinkId    = gVdisModuleContext.swMsId[i];
        displayPrm[i].inQueParams.prevLinkQueId = 0;
        displayPrm[i].displayRes                = swMsPrm[i].maxOutRes;
    }

Why does the timer period set 30? Why is not 33?

I have try to use 33, but the analog capture preview images are not sync among same analog source.

thank you!

Jacson