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question about console flush

hi TI-friends,

   DVR-RDK, 

As I connect console output to Putty, I try to Ctrl+S to stop receiving output from serial port and trace some debug info on console. Several seconds later, the video was stopped. The video move again once Ctrl+Q to start receiving output from serial port. Once the time interval was too long, the video can't move. Is there any idea about this??