A: Yes. Use MKVToolNix to add your Hindi audio track (in AAC, MP3, or AC-3 format) to the existing MKV. No re-encoding needed, just remuxing (takes 1–2 minutes).
: The Matroska Video container. Unlike MP4, MKV can hold unlimited video, audio, picture, and subtitle tracks in a single file. jurassicparkiii2001720pdualaudiohinengmkv+extra+quality