Dual audio means a video file contains two or more audio tracks — in this case, the original English and a Hindi dub. Indian viewers often prefer dual audio for several reasons:

John Carter’s Hindi dub was produced professionally for television and home video, and it became sought after once the film disappeared from streaming platforms.

No official 4K HDR Hindi dub exists. Disney released 4K only in English.

John Carter stars Taylor Kitsch as a Civil War veteran who is mysteriously transported to Mars (called Barsoom by its inhabitants). There, he finds himself caught between warring alien factions, including the towering Tharks and the human-like Heliumites. Carter discovers he has superhuman strength and agility due to Mars’ lower gravity. With help from Princess Dejah Thoris (Lynn Collins) and Tars Tarkas (Willem Dafoe), he fights to save the planet while uncovering his own destiny.

The film was praised for its visual effects, world-building, and John Carter’s anti-hero charm, but marketing failures led to a disappointing theatrical run. However, home video and streaming gave it a second life — especially in non-English markets like India, where Hindi-dubbed versions became popular.