The "Dual Audio" in your filename typically refers to the movie being available in Tamil (the original language) and Hindi (dubbed). "Vegamovies" refers to the distribution source, and "1080p HEVC" indicates high-definition video compression.
: Usually includes the original Tamil track alongside a dubbed version (frequently Hindi) or subtitles. --- Mersal -2017- 1080p HEVC Dual Audio Vegamovies....
According to official IMDb technical specifications , the film features: The "Dual Audio" in your filename typically refers