What to do if you downloaded a video, and when you try to switch the audio track, you see only the following picture:
At the same time, there is a soundtrack for the film.
Let’s consider the order of actions.
1. Open the program VLC media player and select the menu Media item Open file with parameters:

2. In the window that appears, click Add:

3. Select a movie (not an audio track!) And click Open:

4. In the window, check the Show additional parameters box:

5. Then put a tick in the Play another media file (audio) in parallel .. :
6. … and select Review:
7. In the new window, select the Add button again:

8. … and now we select the audio track file:

9. After the performed operations, it remains only to click the Play button:

10. Now you have a choice: