AVFoundation Camera : No audio for higher resolutions

Originator:utugau
Number:rdar://31649115 Date Originated:April 16, 2017
Status:OPEN Resolved:NO
Product:iOS - AVFoundation Product Version:iOS 10.3.1
Classification:SERIOUS BUG Reproducible:always
 
There is no audio when you choose some higher resolutions of a given camera.

Test this on iPad Pro 9.7".

1. Setup a video camera application CIFunHouse, for example, to record videos with one of the following cameras or resolutions

FRONT CAMERA: 960p @ 30 or 60 fps or
BACK CAMERA 4032x3024 at 30 fps

You will see that there is no audio.

captureOutput:didOutputSampleBuffer:fromConnection: is never called for audio connections.

If you store the output to a file, you will end with a video file without sound.

I expect all allowed formats to have sound. This is not a matter of CPU load, because the front camera shooting at 960p results on a picture that is way smaller to 4032x3024 and there is still no sound.

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