Warning: Unable to play audio because no audio outputs were found.

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Hey, I'm trying to play an mp3 file on MATLAB, but it's giving me this error:
Warning: Unable to play audio because no audio outputs were found.
> In audiovideo.internal/audioplayerDesktop/hasNoAudioHardware (line 565)
In audiovideo.internal/audioplayerDesktop/play (line 228)
In audioplayer/play (line 349)
In sound (line 77)
This is my code:
[y,Fs] = audioread('Applause.mp3');
sound(y,Fs);
I'm not sure what I'm doing wrong...

Answers (4)

Vinai Datta Thatiparthi
Vinai Datta Thatiparthi on 13 Apr 2020
Hello Anthony,
This error could be the result of the path being modified, or the necessary libraries being removed to access the sound components on the computer. To fix this, in the command window, use -
restoredefaultpath
rehash toolboxcache
savepath
Further, evaluate if MATLAB is able to read the available outputs for audio on your PC using the function audiodevinfo. This results in a struct array containing all available & recognized audio inputs/outputs.
info = audiodevinfo
In case info returns an empty struct, it could be because of faulty drivers. Update all your drivers or disable devices one at a time and restart MATLAB and try 'audiodevinfo' to figure out if one or more devices has a possible faulty driver.
Instead, if info returns a struct with available outputs for audio (non-empty), you should be able to play the audio using audioplayer object. Additionally, if info has recognized multiple audio outputs, you can also use "device ID" to specify the output audio device.
Hope this helps!
  4 Comments

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Guilherme Vitor Santos
Guilherme Vitor Santos on 3 Jun 2022
estou com esse poblema matlab online
Error evaluating 'InitFcn' callback of Audio Device Writer block (mask) 'lllabtetecom/Audio Device Writer'.
Callback string is 'audioblkAudioDeviceIO(gcbh, 'initfcn');'
Caused by:
No audio input device detected
  1 Comment
Walter Roberson
Walter Roberson on 3 Jun 2022
If you are using matlab online then audio can only be used with Chrome browser.

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Image Analyst
Image Analyst on 3 Jun 2022
This happens to me a lot. I have a PlaySoundFile() function that plays a sound file through the speakers. I'm using MATLAB desktop, not online. I have to do the restoredefaultpath to fix it. Then it's fixed for a while but something causes it to break again and I'll get the error message again
In PlaySoundFile (line 74)
Warning: Unable to play audio because no audio outputs were found.
> In audiovideo.internal/audioplayerDesktop/hasNoAudioHardware (line 565)
In audiovideo.internal/audioplayerDesktop/play (line 228)
In audioplayer/play (line 349)
In sound (line 77)
In PlaySoundFile (line 74)
I wish I could figure out what is causing it to break. I don't believe it's because I'm removing sound libraries. I do set the path to some folders in my startup.m file but that happens every time I start MATLAB and it works fine until some mysterious process causes it to break, so it's not adding things to the path that's causing it to break.

Jonas
Jonas on 13 Jul 2022
anything new on this topic? can't make matlab to play sounds again, there are audio devices available, resetting/rehashing has not the effect i hoped to see. Only a matlab restart can resolve this for me, but i need to reset on runtime, e.g. if this issue comes up during use of a self created app
  6 Comments
Image Analyst
Image Analyst on 19 Jul 2022
@Jonas, no because I restarted and it's working again. It's not currently broken (yet). That (audiodevreset) might be a faster way to fix it than restarting. I can try it. But we'd really like to know what happened to break it in the first place so we don't have to fix it.

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