bin/datamosh in aviglitch-0.1.3 vs bin/datamosh in aviglitch-0.1.4

@@ -32,31 +32,39 @@
     puts opts
     exit
   end
 end
 
-input = Dir.glob opts.parse!
+input = opts.parse!
 if input.empty?
   puts opts
   exit 1
+else
+  input.each do |file|
+    if !File.exist?(file) || File.directory?(file)
+      opts.banner = "#{file}: No such file.\n\n"
+      puts opts
+      exit 1
+    end
+  end
 end
 
 a = AviGlitch.open input.shift
 unless fake
   a.glitch_with_index :keyframe do |frame, i|
     (!all && i == 0) ? frame : "" # keep the first frame
   end
 end
-a.clear_keyframes!(!all && !fake ? 1..a.frames.size : nil)
+a.mutate_keyframes_into_deltaframes!(!all && !fake ? 1..a.frames.size : nil)
 
 input.each do |file|
   b = AviGlitch.open file
   unless fake
     b.glitch :keyframe do |frame|
       ""
     end
   end
-  b.clear_keyframes!
+  b.mutate_keyframes_into_deltaframes!
   a.frames.concat b.frames
 end
 
 a.output output