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change osd context on dm8168 display with dvrrdk

Hi,

I develop on dm8168 using dvrrdk ,

i see the Demo_captureSettings function,

the osd window can change position,size and so on

and how to change the osd context,

Just change the global var (g_osdChParam.winPrm[winId].addr[0][0] )'s value by new osd context addr?

Using Vcap_setDynamicParamChn(){ case VCAP_OSDBLINDWINPRM}.

1) if so,when  i want to overlay a time stream then i have to change all the time, the prev context addr is in use,and i update, will it be display ok,

    especially when the params are quit different.

2) if not how to this ?