The problem background

On MacBook, iMac, Mac Pro, and Mac Mini devices, the QuickTime Player can only record the sound of the microphone, not the sound played by the computer itself.

When encountering some recording or screen recording scenes need to record the internal voice of the computer is very inconvenient.

At this point, some tools are needed to enable QuickTime Player to record sounds from inside your computer.

Software installation

Step 1- Download

  • Download method 1: I have registered and downloaded the installation package in advance, you can directly click here to download
  • Download method 2: Download from the official website (you need to climb over the wall, fill in the email, and select the 16CH version)

Step 2- Installation

Then double click to install.

Step 3- Verify

If you open the MIDI software provided by the system, BlackHold 16CH is displayed on the left, indicating that the installation is successful.

Configuration mode

1 Start the MIDI software

2 Create an aggregation device

Click on the plus sign in the lower left corner and select create Aggregation Device

You can customize a name, such as “My QuickTime entry”

Then just check “BlackHole 16CH”, as shown in the figure

Principle: This device is a virtual microphone input device, it will BlackHole 16CH device voice as the microphone input

3 Create multiple output devices

Click the plus sign in the lower left corner and select “Create Multiple Output Device”

You can customize a name, such as “My virtual speaker”

Check your audio speakers (such as Macbook Pro speakers) and “BlackHole 16CH” in order to make sure the default speaker is placed above the BlackHole 16CH.

How it works: This device outputs sounds played by computer software to two selected devices: Macbook Pro speakers and BlackHole 16CH

Using the authentication

1 Modify output devices

Click on the top sound position to change the output device to the multi-output device “My Virtual Speaker” set earlier.

2 Start Recording

2.1 Creating a Recording

Open QuickTime Player and select New Audio or New Screen Recording

2.2 Selecting audio Sources

As shown in the picture, select the “My QuickTime Record Input” set earlier

Principle that

As shown in figure

  1. We first installed an audio device called Blackhole 16CH using Blackhole software

  2. Then, using the system’s built-in MIDI software, I created a virtual speaker, “My Virtual Speaker,” that output sound to both a physical speaker (such as a Macbook Pro speaker) and a BlackHole 16CH

  3. Also create a “virtual microphone” for my QuickTime input to receive BlackHole 16CH sounds

Blackhole is a blackhole that transmits the sound inside the software to quicktime

Q&A

  1. If it does not work after a long time, you can reinstall blackhole
  2. The volume of the virtual speaker cannot be adjusted. You can adjust the audio speaker (such as the Macbook Pro speaker) before switching to the virtual speaker