Update lib/rvideo/inspector.rb

Author: Tom Rossi

lib/rvideo/inspector.rb

@@ -50,7 +50,7 @@ def initialize(options = {})
         raise ArgumentError, "Must supply either an input file or a pregenerated response" if options[:raw_response].nil? and file.nil?
       end
 
-      metadata = /(Input \#.*)\nMust/m.match(@raw_response)
+      metadata = /(Input \#.*)\n.+\n\Z/m.match(@raw_response)
 
       if /Unknown format/i.match(@raw_response) || metadata.nil?
         @unknown_format = true