George Lucas famously said that “Sound is 50 percent of the movie‑going experience, and I’ve always believed audiences are moved and excited by what they hear in my movies at least as much as by what they see.” Sound design for films and television is complex and multi-layered and involves many moving parts. It includes everything that is heard in a movie — words, sound effects, and music. Diegetic sound in film refers to the elements of sound that come from what we see inside the world on the screen, including dialogue, doors slamming, footsteps, and so on. Non-Diegetic Sound refers to elements of sound that come from outside that fictional world, including the musical score and sound effects.
Determinants of Location Sound
Beginning with the weather and the cloud cover to ambience sound from the surroundings— whether it is from hawkers, trains, vehicles, curious onlookers or more— interference issues when it comes to location sound are too many to name. Not just that, the buildings/streets where the shoot is taking place need to be cleared out, necessary permits issued and people and neighbours paid for a day’s work or more— depending on how long the shoot takes, so that there is quiet and the sound can be controlled. Furthermore, sound recordists, boom operators and sound assistants need to be hired to operate the sound gear, look after equipment and set up everything so that the sound recorded is optimal. If the shoot is in a place that is particularly hot or cold, heaters, setting up shade using tents and even fans and portable air conditioner units might need to be used.
Sound in Post-Production
After the film shoot and during post-production, the first stage of sound editing is called “spotting,” where the editors and possibly the director go through every second of the film with the supervising sound editor in order to generate a list of every sound that needs to be added, augmented, or replaced. Though this is usually a time-consuming process, directors typically prefer production dialogue, which is an integral part of the actors’ performances, to looping (rerecording speech in post-production), since it is almost impossible to recreate all the conditions of the shoot in the studio.
Consider the case of the movie Forrest Gump. According to Randy Thom, sound designer for the film, almost none of the sound recorded while the film was being shot found its way into the final cut of the movie. This is because the audio quality was not good enough. What typically happens in this case is that actors return to a studio to re-read their lines and dialogue is synchronized using a process called automated dialogue replacement (ADR). Unfortunately, this increases the budget of the film considerably.
Pros & Cons of Studio Sound
While studios instantly solve the issue of not being able to control the environment and quality of sound, the downsides to studio sound is that the studio will have to be rented and sets have to be constructed and outdoors are not very easy to replicate in a studio. Studios save a lot of time and there is a lot of effort that gets saved because it cuts out all the numerous factors that recording on location brings with it. When the cost of hiring a crew is considered, saving time translates to saving money. So while building sets might involve a portion of the budget, the time involved might be considerably lesser.