Audio not playing in Unity

Question

I am trying to program a script that when you hit an enemy it plays a sound, problem is I can't get it to play the sound it sees the audio source but my script won't pass the clip to it.

Here is the code I currently have:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Audio;

public class makeanoise : MonoBehaviour
{
    public AudioClip hurtSound;
    public AudioSource soundSource;

    private void Update()
    {

        if (!soundSource.isPlaying)
        {
            soundSource.clip = hurtSound;
            soundSource.Play();
        }
    }
}

how do you get the audio source to play the sound? because not even my team mates know to do it

Answer 1

I am trying to program a script that when you hit an enemy it plays a sound

Use collision detection + collider instead of the Update function to detect the hit then play audio:

void OnCollisionEnter(Collision collision)
{
    soundSource.Play();
}

If 2D game, use OnCollisionEnter2D instead.

I can't get it to play the sound it sees the audio source but my script won't pass the clip to it.

There are just many reasons why Audio many not play in Unity. Your sound won't play not because you put it in the Update function.The reason it's not the Update function like some mentioned is because you protected it with if (!soundSource.isPlaying) so it will only play again only when the first one is doe playing.

Reasons why audio won't play in Unity: (From likely to unlikely)

1.The AudioClip is not assigned.

This is your AudioClip

public AudioClip hurtSound;

If hurtSound not assigned or initialized in the Editor or via code, Unity won't throw any error. It simply won't play.

Simply drag the audio to your hurtSound slot and you should hear the sound. Sometimes, the audio reference is lost so simply repeat this step again to recreate the reference.

---

2.Editor is muted. If the Editor is muted no sound will be coming out of it but the build should have a sound. Check and disable the mute on the Editor.

---

3.Playing the sound every frame. This mistake is not uncommon and it causes the AudioSource not have time to play the audio over and over again.

Example of this mistake:

private void Update()
{
    soundSource.Play();
}

Possible fix:

Check the Audio is playing first before playing it.(Did this in the code from this question which is correct!)

private void Update()
{

    if (!soundSource.isPlaying)
    {
        soundSource.Play();
    }
}

---

4.The GameObject the AudioSource is attached to has been destroyed. This is also common. If the GameObject the AudioSource has been attached to is destroyed, the Audio would not play.

The fix is to attach the AudioSource to GameObject that doesn't destroy. An empty GameObject is fine.

Or you can play the Audio, wait for it to finish playing then destroy it:

IEnumerator playAudio()
{
    //Play Audio
    soundSource.Play();

    //Wait until it's done playing
    while (soundSource.isPlaying)
        yield return null;

    //Now, destroy it
    Destroy(gameObject);
}

---

5.The GameObject the AudioSource is attached to has been deactivated.

If the GameObject that has the Audiosource is deactivated, the audio would also stop. Don't deactivate the AudioSource GameObject. See #4 for possible workarounds.

---

6.The code is not even executing.

You must make sure that the Play code is even executing. A simple Debug.Log function call is enough to determine this.

private void Update()
{

    if (!soundSource.isPlaying)
    {
        soundSource.clip = hurtSound;
        soundSource.Play();
        Debug.Log("Played");
    }
}

If you can't see that log in the Console tab then the code is not executing.

A.Script is not attached to a GameObject. Attach it to a GameObject:

B.The GameObject the script is attached to is not Active. Activate it from the Editor:

C.The script is not enabled. Enable it:

---

7.The AudioSource is muted or volume is 0.

---

8.The AudioListener component is not present. This is very unlikely since it is automatically attached to your camera. Check if it is deleted by mistake then re-attach it to the camera. It must be attached to the camera not to any other object.

---

9.Bad Audio. Replace with another Audio.

10.Bug. Go to the Help ---> Report a Bug.. menu and file for a bug report.

This is what to do if everything above has failed. This is unlikely the problem but could happen when there is a big OS update.