Obtaining the audio of only the dialogue of a movie can be accomplished through a process known as audio separation or audio isolation. This is a technique used in audio post-production to extract specific audio elements from a mixed audio track. The objective is to separate the dialogue from the rest of the audio elements such as sound effects and music.
There are several methods for audio separation, including manual separation, spectral editing, and source separation.
Manual separation involves manually isolating the dialogue by using tools such as equalization, volume adjustment, and noise reduction. This method is time-consuming and requires a skilled operator.
Spectral editing involves using software that can analyze the frequency spectrum of the audio and separate the audio elements based on their unique spectral characteristics. This method is more automated and can be done with a variety of software tools such as Adobe Audition or Izotope RX.
Source separation is a method that utilizes machine learning algorithms to separate audio elements based on their unique features. This method is highly automated and can be done with software such as Deezer's Spleeter or Facebook's Open Source tool, Voice Filter.
In order to obtain the audio of only the dialogue of a movie, it is recommended to use a combination of manual separation and spectral editing or source separation. The manual separation can be used to fine-tune the results obtained through the spectral editing or source separation methods.
It is important to note that the quality of the final product will depend on the quality of the original audio mix and the skill of the operator. In some cases, the dialogue may still contain some background noise or bleed from other audio elements.
In conclusion, obtaining the audio of only the dialogue of a movie requires a combination of audio separation techniques and manual adjustment. The use of spectral editing or source separation software can help automate the process, but the final product will depend on the quality of the original audio mix and the operator's skill.