audio data buffer is always zero, why?

[danielpaulus]

audio data buffer is always zero, why?

[danielpaulus]

Hey there 👋
That is weird, I just tried on my iPhone X and even when I don't play any sound on the device, still I get a wave file created. Can you run go run main.go record out.h264 out.wav -v and post the logs here? Also please let me know which device and version you are using :-)

[fcgll520]

thanks，i found the reason.
Another problem,
why iphone's showing time is changed(like, 09:41) when usb connecting?

[danielpaulus]

Yes and also it removes the provider info and changes the battery status that is displayed I think. That is Apple's default behavior, I guess they don't like mobile vendors and empty batteries in their presentation :-D As for the time, that is when the first iPhone was released or something.
I never tried to grab audio only, maybe then the display would be unaffected? Is that a use case you have?

[fcgll520]

When playing music in iphone's music app, it changes iphone->system capture mode, and then, the receiving audio is just silence. Know why?