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@@ -19,13 +19,13 @@
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     ft3 = FrameTime.parse($3)
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     # start time has to increment a second
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-    ft1.add(1)
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+    ft1.add!(1)
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     # end time has to decrement one frame
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-    ft2.minus(0,1)
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+    ft2.minus!(0,1)
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     # duration has to decrement one second and one frame
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-    ft3.minus(1,1)
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+    ft3.minus!(1,1)
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     "#{ft1}\t#{ft2}\t#{ft3}"
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   end

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@@ -18,7 +18,7 @@
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   end
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   # this should be named nicer
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-  def add(s, f=0)
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+  def add!(s, f=0)
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     @frame = @frame + f
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     @time += (s + @frame / @frames) #if the frames tick over to a new second, compensate
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     @frame %= @frames
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@@ -26,7 +26,7 @@
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   end
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   # this should be named nicer
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-  def minus(s, f=0)
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+  def minus!(s, f=0)
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     self.add(-s, -f)
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   end
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