How does Apple mobile phone extract music from video to make ringtones?

The specific operation of Apple mobile phone to extract music from video as ringtone is as follows:

Tools/materials: iPhone 12, iOS 16.0, cool dog ringtone 6.6.0.

1. Turn on "Cool Dog Ringtone" in your phone.

2. Click "My" in the lower right corner of the interface.

3. Select the "Local" option in the interface.

4. Click "Video" in this interface.

5. Find the video to be converted into audio, and click "Extract Audio" in the lower left corner to successfully convert it into audio.

6. Click "Set ringtone" at the bottom of the interface to use audio as ringtone.