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@@ -17,6 +17,16 @@ class FrameTime
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     end
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   end
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+  def +(timecode)
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+    seconds, frames = to_sec_and_frame(timecode)
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+    self.add!(seconds, frames)
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+  end
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+  
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+  def -(timecode)
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+    seconds, frames = to_sec_and_frame(timecode)
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+    self.add!(-seconds, -frames)
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+  end
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+  
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   # this should be named nicer
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   def add!(s, f=0)
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     @frame = @frame + f
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@@ -27,9 +37,28 @@ class FrameTime
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   # this should be named nicer
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   def minus!(s, f=0)
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-    self.add(-s, -f)
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+    self.add!(-s, -f)
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   end
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   def to_s; @time.strftime("%H:%M:%S:#{@frame.to_s.rjust(2,'0')}"); end
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   def inspect; self.to_s; end
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+  
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+  class << self
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+    private :new
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+  end
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+  
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+  protected
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+  def to_sec_and_frame(timecode)
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+    if timecode =~ /(\d\d):(\d\d):(\d\d):(\d\d)/
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+      hours = $1.to_i
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+      minutes = $2.to_i
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+      seconds = $3.to_i
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+      frames = $4.to_i
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+      
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+      seconds = seconds + minutes*60 + hours*3600
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+      return seconds, frames
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+    else
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+      return 0,0
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+    end
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+  end
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 end
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