Start scrcpy 2.0 by NodeJS but cannot receive "Recording Started" in stdout pipe

- [x] I have read the [FAQ](https://github.com/Genymobile/scrcpy/blob/master/FAQ.md).
- [x] I have searched in existing [issues](https://github.com/Genymobile/scrcpy/issues).

**Environment**
- OS: macOS
- scrcpy version: 2.0
- installation method: brew
- device model: All device
- Android version: All version

**Describe the bug**
Hi,
I just start scrcpy 2.0 by NodeJs but cannot receive "Recording Started" in stdout pipe.

I tried scrcpy 1.24 Its ok. So i think this is a new bug from 1.45 to 2.0

More Information:
I guess its something wrong between buffer area? Maybe print but not '\n' or cout but not "<< endl;" ? Just a guess

Start by reproducing scrcpy 2.0 from Node.js on macOS and compare the stdout behavior with scrcpy 1.24. Trace how the recording-start message is emitted and determine whether it is present and pipe-readable; done means Node.js can reliably receive the notification.

Written by the indexing model from the issue text.