If you've never watched a movie or TV show with multiple audio tracks on VLC, you might find it frustrating to manually select the audio for each episode. For example, your favorite Japanese animated series might keep playing in Japanese when you prefer to watch it with Vietnamese audio. Fortunately, setting a default language is quite straightforward. Today, Mytour will guide you through the process.
Steps
Simple Setup

Launch VLC. Since we're only adjusting settings, you don't need to open any specific file with the program.

Select Tools from the options at the top of the window. A dropdown menu will appear.

Choose Preferences from the dropdown menu. A new window with a list of options will pop up.
- Alternatively, you can press CTRL + P to open the Preferences window.

Select the Simple settings. In the bottom-left corner of the Preferences window, there will be two options; ensure that Simple is selected. This is the default setting, but it’s good to double-check.

Click on the Audio tab. Choose the Audio tab from the left or top of the window. This option is represented by a traffic cone wearing headphones.

Enter your desired audio language. Look for the Tracks heading near the bottom of the audio settings. Then, input the language code you want to hear in the field next to "Preferred Audio Language." You can find a list of codes here: http://www.loc.gov/standards/iso639-2/php/code_list.php. Try the 639-2 codes first, and if they don’t work, use the 639-1 codes.
- English: eng
- Japanese: jpn
- Vietnamese: vie

Customize subtitle settings. If you wish to set a default subtitle track, you can do so within the same preferences window. You’ll also find additional customization options for subtitles, such as font type, size, shadow effects, and more.
- Click on the Subtitles tab located at the top or left side of the window.
- Enter your preferred language code in the field next to "Preferred Subtitle Language." For a comprehensive list of codes, visit: http://www.loc.gov/standards/iso639-2/php/code_list.php

Click Save. Press the Save button at the bottom-right corner of the screen to confirm your changes.

Restart VLC. To ensure your changes take effect, restart the VLC media player.
Advanced Settings

Select all settings. In the Preferences window, choose All at the bottom-left corner. If the simple method doesn’t work, the audio track might not be compatible. In such cases, you may need to manually set the default audio track, which could require some trial and error to get right.

Select Inputs/Codecs from the left side of the Advanced Preferences window. A new page titled Inputs/Codecs will appear.

Adjust the audio track number. If the file contains multiple audio tracks, you may need to experiment to find the correct one. For files with only two tracks, 0 or 1 will likely be the correct option. Track 0 is the default if you reset preferences, while Track 1 is the secondary option.

Enter the desired language code. If the simple method didn’t work, this step might not resolve the issue, but it’s worth a try. Input the language code you want into the field next to "Audio Language." Refer to this list for language codes: http://www.loc.gov/standards/iso639-2/php/code_list.php.

Change the subtitle track number. If you’re still having trouble setting the default subtitle track, try experimenting with different track numbers.

Click Save. Press the Save button at the bottom-right corner of the window to confirm your changes.

Restart VLC. You’ll need to restart the program to apply the changes you’ve made.
Tips
- Patience is key during this process. While it might be frustrating, succeeding will save you a significant amount of time in the long run.
Warnings
- Be cautious when sharing videos via torrents.