Is it possible to get only audio from ScreenCaptureKit?

I'm creating app that listening other app's sound. in this use case, screen data is not needed.

but if I don't call SCStream#addStreamOutput(_, type: .screen, ...), console shows this error:

[ERROR] _SCStream_RemoteVideoQueueOperationHandlerWithError:701 stream output NOT found. Dropping frame

currently I'm setting SCStreamConfiguration#minimumFrameInterval to large value (e.g. 0.1fps) as workaround, but it would be good if i can completely disable screen capture for best performance.

there is any way to disable screen capture and only captures apps audio?

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Posted by
rinsuki
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Did you find a solution for this? I'm also hoping to capture audio only without the video data.

Posted by
hundley
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You can, but you also have to capture screen and just filter the samples out in the callback.

Posted by
nitro805
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  • That is just a workaround. screen image is still saved and shared from WindowServer which incurs unnecessary costs. also If the screen is disconnected (e.g., when you close the lid), the session will also disconnect.

    —
    rinsuki
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choose output type - audio in DidOutputSampleBuffer function and use avassetwriter to write the system audio buffer

Posted by
alan02
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The error you're seeing, stream output NOT found. Dropping frame, is related to memory management. Your stream output object has been cleared from the memory. Make sure you put it in an instance variable - self.output = streamOutput

Posted by
median.tech
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