Behind the scenes, a pirate "encoder" takes the Inception Blu-ray (1080p) and uses software like Audacity to extract the Tamil audio from a telecast. They then use MKVToolNix to mux (merge) the Tamil audio with the HD video. This results in a file that looks flawless but is stolen.
However, downloading from Isaimini is like being stuck in Limbo —you think you are getting what you want, but you are actually losing time, security, and moral ground. The "exclusive" file is a trap.