Fix issue with shorter vides (less than 3 seconds) causing issues with thumbnail generation

README.md

@@ -41,7 +41,7 @@ In your model:
 This will produce:
 
 1. A transcoded `:medium` FLV file with the requested dimensions if they will match the aspect ratio of the original file, otherwise, width will be maintained and height will be recalculated to keep the original aspect ration.
-2. A screenshot `:thumb` with the requested dimensions regardless of the aspect ratio.
+2. A screenshot `:thumb` with the requested dimensions regardless of the aspect ratio and with `:time => 10`, it captures a frame from the 10th second of the video.
 
 ### Meta Data
 

lib/paperclip/paperclip_processors/transcoder.rb

@@ -30,7 +30,7 @@ def initialize file, options = {}, attachment = nil
         @shrink_only      = @keep_aspect    && modifier == '>'
       end
 
-      @time             = options[:time].nil? ? 3 : options[:time]
+      @time             = options[:time].nil? ? default_time : options[:time]
       @auto_rotate      = options[:auto_rotate].nil? ? false : options[:auto_rotate]
       @pad_color        = options[:pad_color].nil? ? "black" : options[:pad_color]
 
@@ -105,6 +105,11 @@ def format_geometry geometry
     def output_is_image?
       [email protected]_s.match(/jpe?g|png|gif$/)
     end
+
+    def default_time
+      duration = @meta[:duration].to_f rescue 0
+      duration < 3 ? 0 : 3
+    end
   end
 
   class Attachment