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What's wrong with demo loopback in dvsdk_1_01_00_15?

Hi:

 In order to  capture and display video constantly, I changed " for(i = 0; i < NumOfIterations; i++)" into "while(1)"  in  demo loopback .

 Compile without any error and then  run program in my target board . The program will halt about  ten or thirty minutes later.

 What's wrong with this program ?

 Is there  any other setting which I should to do?

The same things happen in  DVSDK1_11_00_00 and  DM648 DVSDK .

Thanks.