MKVs often have multiple languages "burned-in" or attached as separate tracks.
If you need to play the file on a smart TV or share it where MKV isn't supported, converting it to MP4 is best. : Open VLC and go to Media > Convert / Save . Add your MKV file and click Convert / Save . Select a profile like Video - H.264 + MP3 (MP4) . Choose a destination and click Start . AgADpAcAAquBqFU.mkv
: If the video stutters, it might be a 4K file that is too heavy for your hardware. Try playing it with "Hardware Acceleration" enabled in your player settings. MKVs often have multiple languages "burned-in" or attached
: In VLC, right-click the video during playback and select Audio > Audio Track or Subtitle > Sub Track to toggle between languages. Add your MKV file and click Convert / Save
: If the file won't open at all, it may have downloaded incompletely. Try re-downloading it from the original source. A quick DVD to VOB to MKV conversion guide - PCR's notepad