Select as appropriate and adjust the sliders accordingly.
To solve this problem, all you should do is to download and install the required codec plugin for the media player.
At other times, you run into Windows Media Player no audio for MP4 video files. This error may occur when you try to play some MKV files on your PC without the requisite software infrastructure. Sometimes muted audio on Windows 7 may splash this error message across the screen: Windows Media Player missing codec.
You should hear the sound from your movie or video footage now. Locate the speaker icon on the right of the player controls and drag or click to increase it, that is if the volume bar rests at zero. If adjusting the system volume does not solve the problem of Windows Media Player no sound MP4, turn your attention to the media player. If the percentage reads zero, double-click on the volume icon to reveal the volume bar from which you can click or drag to increase the system volume. Pointing at it will display the volume level percentage. Start by checking the system tray to find the speaker icon.
The equalizers may have been set to zero on the media player the system sound configured wrongly. Windows Media Player no sound could be as a result of improper volume settings on either the media player or the computer.