To permanently merge the Hindi audio into your video file (creating a "Dual Audio" file) without losing quality:
MKVToolNix merged the track without compression. This is normal. To reduce size, you can use HandBrake to compress the final file, but you will lose video quality. Keep the double-sized file for best quality.
This is the easiest way to watch the movie with Hindi audio without modifying the original file. and navigate to
: You can access the Hindi audio track on JioHotstar , which lists the movie with multiple language options including Hindi, Tamil, Telugu, and English.