This shows that audio session is sending CMSampleBuffer objects that are now fundamentally different (this new format is not handled by AVAssetWriter and I get an error upon calling AVAssetWriter.append Hi @maverick1979, did you check this info with other devices than iPhone 14 series ? Because I already checked this data and it seems on my side that this behavior is the same on iPhone 11 / 12 / 13 series but there is no audio issue on these series, while there is one on 14 series.

I also work on an app with kind of "video conferencing" use case. We use WebRTC for this use case and, on iPhone 14 (at least Pro, didn't have the chance to test with other devices) we have sound issues as soon as the WebRTC connection to another device is up and running. Did someone found how to solve this ?