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Describing video in audio in the video production process allows visually impaired individuals to experience the video. To help visually impaired individuals better understand the film, audio narration is provided about what characters are wearing, what they are doing, their ages, and other physical descriptions. Individuals who have impaired vision can watch Comedy Network, Discovery Television, Hiccups, 11th Hour, plus some other programs using descriptions of visual elements. These shows need to be first changed into Descriptive Video Interface (DVI). Descriptive video thus allows visually impaired people to watch television and share the enjoyment with the whole family. Descriptive video is created by businesses such as Descriptive Video Productions in Toronto, ON.

The technology is based on multi channel television sound (MTS) that uses a third audio channel, known as the Secondary Audio Program (SAP). DVI is called alternative audio. Viewer experience is enhanced when key visual elements are audio described. For a movie, descriptions are not included with the soundtrack. The film runs a separate DTS soundtrack.

Research on voice narrations began in 1985, when a company with a past of creating captioning of programs for hearing-impaired people, decided to look at approaches to offer a better experience for people with no vision. Individuals with hearing and vision impairment, spend more time watching TV when compared with others, and live mostly indoors due to their impairment. The market for the descriptive video was huge, and in 1988 the DVS organization was formed. It researched and developed description techniques. It was first introduced for TV by PBS and later utilized to make movies for those with no vision. Today, the DVS feature is found even on DVDs.

It is now easy for vision impaired people to enjoy movies along with the rest of the family since new TVs include a SAP channel. All you have to do is select the SAP channel to get and record DVS. The feature is found under audio on the onscreen menu accessible with the VCR remote. So, first set it to SAP, load the DVD that contains the DVI movie and view it. Additionally you can refer to the TV or VCR manual to establish SAP viewing. The visually impaired will wear a headphone to hear their separate version of narrative audio for their entertainment, while you will hear the regular audio along with the rest of the family.

SAP can be utilized in movie theatres to enable visually impaired people to watch movies. The use of headphones will allow them the use of the SAP channel. A lot of companies are working towards building described video for the US and Canadian producers, so everyone in the family can enjoy a good movie together.

The ways we view and interact with content has evolved with the advent of these kinds of modern technologies. Visually impaired can now view movies and television shows, and soon they'll also be watching movies on the internet and PDAs. The voice narrations that describe visual elements can make various projects and education more accessible to visually impaired people worldwide.