No sound after upgrade to Wwise 2017 on iOS devices (Unity)

Question

I'm using Unity 2017.1.0p5, and just upgrade to Wwise 2017.1.1.6340.770. It works perfectly on window editor, windows build, android build; however, it doesn't seem to work on iOS build (on device). There is no sound at all. No error or warning about the sound bank is not loaded, the sound engine seems initialized properly as well. See following logs:
WwiseUnity: Initialize sound engine ...
AkInitializer:Initialize()
AK Info: Number of dectected and configured output channels: 1
AK Info: Using output port: Speaker of type Speaker with 1 output channel(s)
WwiseUnity: Sound engine initialized.
AkInitializer:Initialize()

But then, there are some error message following:
AK Error: Unknown game object ID. Make sure the game object is registered before using it and do not use it once it was unregistered.
AK Error: Unknown game object ID. Make sure the game object is registered before using it and do not use it once it was unregistered.
...
There are 12 of them.

And there is no SFX no music can be heard on device.

Anyone experience this? Any idea how to solve it?

Answer 1

Hi Sherry,
We recently fixed a similar issue on iOS devices in Wwise 2017.1.3. The problem was that there was no sound audible when using AAC format on iOS 11.
Upgrading to Wwise 2017.1.3 may solve your issue.

Thank you