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macOS 27 beta's AUHAL rejects mpv's channel-layout property with paramErr (-50), so the coreaudio AO fails to initialize and playback is silent. Change the macOS ao option from "coreaudio" to "coreaudio,avfoundation" so mpv self-heals: older macOS keeps using coreaudio unchanged, while the beta drops to avfoundation (AVSampleBufferAudioRenderer) instead of playing no sound.