The library is making assumptions about the source file format.

[pixlwave]

Describe the bug
As described in element-hq/element-ios#6603, OGGConverter and OGGDecoder make assumptions about the format of the file, in particular that the file is mono. This can result in incorrect decoding and playback when a user tries to play an opus file that wasn't sent using the voice message functionality.

To Reproduce
See the issue in Element iOS

Expected behavior
The library should determine the format of the audio decode from the file rather than having this hard-coded.

Smartphone (please complete the following information):
iPhone 12 on iOS 15.6.1 running Element 1.8.27

[pixlwave]

Also potentially related is element-hq/element-ios#6584 but still waiting on more info for that one.

[pixlwave]

Update on element-hq/element-ios#6584, its crashing when creating the decoder which is returning a nil value.