"300MB Dual Audio MKV" refers to a specific type of highly compressed movie file format that became a staple of internet culture, particularly in regions with limited bandwidth or storage. What it Means

two different language audio streams

Dual Audio means the MKV file contains . Typically, this is:

We’ve all been there. Your phone storage is full, you have a long commute ahead, and you desperately want to watch that new action movie. Streaming isn’t an option because of patchy mobile data.

You’ve downloaded a "300mb Dual Audio Mkvin English/Hindi," but it’s playing in Hindi, and you want English. Here is the fix for VLC: