Weird problem when playing some mp3 files on iOS

cocos2d-x
#1

Hi, we are using AudioEngine to play background music in MP3 format and we are having a problem with some files. A weird sound artifact can be heard a second just after the sound start.

The problem can only be heard in iOS, Android is fine.

We tried cutting the mp3 into a smaller file and the artifact disappeared. Also if we use .wav files the artifact disappear.

We are also using cocos2d-x v3.09 but we tested it on v3.12 and the issue persist.

We created a small test project with this sound file so you can test.
https://drive.google.com/open?id=0B88Hp_AZaft0aXFWX0ZiNXNlVGM

Thanks,
Pablo

#2

Probably more likely to be a problem with the audio file than the audioengine.

#3

Yeah, that’s what we thought, but this is not the only file we are having problems, we will keep testing and we will upload more info here.

Thanks!

#4

Have you tried with another bitrates?

#5

Some more test:

This only happens in AudioEngine, SimpleAudioEngine plays the file in the right way.

We did tried different bit rates.

#6

Hi @lito88
I have similar problem with .mp3 soundtracks and AudioEngine.
I have (rare) audio artifact especially when the game goes in background.
With iOS 8.4 audio was fine, I stared to hear the problem with iOS 9.3.3!

#7

Hi @lito88, @drakon99:

We’ve issues too with MP3 and AudioEngine on iOS.

We’re using a bitrate of 128 kbps.

How do you solve them, please? Is better use SimpleAudioEngine or AudioEngine?

Thanks and best!

#8

Hi all, we didn’t solve it yet :frowning: I guess now that this seems to be a problem the cocos2d team might take a look at this, we also uploaded an example of the sound problem.

it would be nice that if someone find a solution to post it here. We will do it if we found one.

#9

Hi,

I am having a strange issue related to AudioEngine on iOS. I have implemented Hotline in my game. And when i close the hotline and come back to game then the AudioEngine stops and do not play any sound. Cocos2d-x version is 3.10. Will this get resolved if i upgrade it to 3.13.1 and does it support cocostudio .csb file. And yes all audio files are .mp3.

#10

Hello!.

I have a problem with iOS playing mp3 sounds witn AugioEngine. My cocos2dx version is 3.15.1

I´ve found an issue similar in the changelog, that is supposedly fixed:
“[FIX] AudioEngine: may have noise if playing mp3 files on iOS/Mac OS X”.

The fix date is after this post, so i guess it may refer to this post.

But my problem is that i am experiencing the same issue with 3.15.1. Mp3 sounds with very small pauses in iOS.

Any hint about this?

Thank you a lot!