Wwise Help

Files: The AAC audio format only supports mono, stereo, 0.1, 1.1, 5.0 and 5.1 files. Other channel configurations are downmixed.

Looping and sample accuracy: Looping across the whole file or within regions is supported. However, the encoding process tends to shift the audio content and/or add padding frames, which may cause artifacts when used in a context where sample-accuracy is needed, for example with interactive music, or in continuous random-sequence containers with sample-accurate transitions.

Run-time characteristics: On iOS, AAC sound uses hardware-assisted decoding if available. The hardware may only decode one AAC sound at a time. Note that the audio thread CPU usage displayed by Wwise will appear to be very large, but most of this time is actually spent by the hardware decoder, therefore yielding CPU time to other processes. On the other hand, software decoding on iOS is very costly and should be avoided.

Latency: Setup time of AAC voices may be fairly long, especially on iOS, and sometimes also with streamed files on the Mac. Additionally, starting an AAC voice on iOS may cause voice starvation.

Authoring: Currently, AAC sounds cannot be previewed in the Wwise authoring tool.