Customize audio output in DVD Player on Mac
If a DVD includes multiple soundtracks, such as a commentary track or dialogue in a different language, you can choose which soundtrack to use in DVD Player.
For some DVDs, you may have to use the movie’s interactive menus to make these changes.
Choose a soundtrack
If there’s more than one audio track, you can select the track you want to hear.
In the DVD Player app
on your Mac, start playing a movie. Choose Features > Audio, then select the audio track. You can also tap the Subtitles button 
in the Touch Bar to see a list of available Audio options.
Select an audio output device
You can use different types of audio equipment to hear the audio from a DVD movie. By default, the DVD Player app plays audio on your computer’s internal speakers or headphones, when connected.
Connect your audio device to your computer.
On your Mac, choose Apple menu
in the sidebar. (You may need to scroll down.)Click Output on the right, then select the device you want to use in the list of sound output devices.
All sound output devices available to your Mac are listed, including the computer’s internal speakers, devices plugged into your computer’s sound port
, USB speakers, and AirPlay devices.For any device plugged into the computer’s sound port, choose Headphones.
