Picture, sound and music. What makes a film? These ingredients certainly. These are the different layers which can be added together or used alternatively to achieve the intended effect.
Picture often works as the conscious element, whereas sound is applicable as emotional component. Music can bridge the gap between the cognitive and the sensitive, defining perception.
Putting together these flavours is like preparing a good meal in the kitchen; the kitchen being the editing room this time. (Once an editor, always an editor. Meaning myself.)
Dosing the additives by creating rhythm, interchange and pace is what makes a film. The idea (writing) is the starting point, collecting material (research, shooting) is the process, editing and post-production are the finishing touches