acess frame by frame of the video using external timer

thothadri at
Wed Apr 3 14:31:32 PDT 2013

hey , what i want is , suppose i call a function every 30 milliseconds or
even 3 milliseconds . for example, 


function timer_event():

  get_frame(n); //this should get the snapshot of nth frame and display it 
  n= n+1;


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