With the preferred languages for audio and subtitle, you can enjoy a video with the set language directly when playing a video with multi track.
1
Go to Settings and tap Audio.
2
Tap Preferred Languages.
3
The top is set to priority. You can add other languages with Add Languages….
3-1
Select a language to add.
4
You can also edit them to move the priority.
5
Tap Audio in Settings button on the left side of playback screen after playing a video which has multi track audio.
6
Go to Settings and tap Subtitle.
7
Tap Preferred Languages.
8
Set the preferred languages for subtitle.
9
The subtitle track is played in the language you set.