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From:
Nonstrict
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Distorted Audio when recording external microphones using AVCaptureSession
https://nonstrict.eu/blog/2025/distorted-audio-avcapturesession
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In certain situations, when recording audio on macOS using AVCaptureSession and AVAssetWriter, the resulting audio file can sound distorted. This issue is caused by AVCaptureSession reporting CMSampleBuffers of different audio formats.