Cant record audio with screen recording in Quicktime

I suspect you have the Quicktime Capture set to "Capture Selection Portion" and not to "Screen Record". I came across the same thing even though I used the Screen Record Hotkeys (Cmd+Shft+5). just set it to "Record Selected Portion" & it should be fine.

I'll also post a neat little setup to get it to record Quicktime Movies from the screen with audio.

since you already have blackhole installed, you can try this:

to record the mac's internal sound with quicktime (or also “shift-command-5”) you need additional software. i use the free BlackHole Virtual Audio Driver. then you can choose "BlackHole 2ch" in the recording options instead of "Built-in Microphone."

you will also need to set up a multi-output device in your audio MIDI setup utility to be able to both hear and record the internal audio at the same time.

to set up a multi-output device:

Open Audio MIDI Setup: (found in /Applications/Utilities)

hit the '+' button in the bottom left corner and select "Create Multi Output Device"

then in the panel that appears on the right, in the Multi-Output Device tab, select "Built-in Output" AND "BlackHole 2ch". (and, if you want, any of your other connected devices.)

once you do that, (and BEFORE recording) you can choose "BlackHole 2ch" or "Multi-Output Device" in your menubar "sound options". 

to both hear the speakers and record the audio at the same time, choose "Multi-Output Device". before choosing multi-out, set the internal speakers' volume to a comfortable level first. you cannot control the volume once you are in multi-out mode.

This only works on an Apple Silicon computer (not Intel) 

You need Homebrew installed. I don’t know the link via “pip”to install, but i’ll assume it’s out there. 

1 ) download & install the Blackhole 2ch. just google it for a link

2) Open “Audio MIDI Setup app”

3) hit the “+”in the bottom left & create 2 setups. name them exactly like this: 

QT_INPUT =  ✅ BlackHole 2ch

QT_OUTPUT =  ✅  BlackHole 2ch

✅  Studio Display Speakers (whatever speakers your computer has)

4) in a Terminal shell. type this command (after the “>”is the command). it installs the switcher.   

>  brew install switchaudio-osx

5) in same Terminal shell. this prints the install location

>  which SwitchAudioSource

6) “/opt/homebrew/bin/SwitchAudioSource” . On some machines it may install in a different location.  

so now add “-a” to the end of the path to list the audio sources:

>  /opt/homebrew/bin/SwitchAudioSource -a

7) you should see all the Audio setups on your computer including the 2 you just made

iPhone Microphone

BlackHole 2ch

MacBook Pro Microphone

MacBook Pro Speakers

QT_INPUT

QT_OUTPUT

8) So now when you want to Record a Quicktime with Audio from a Screen capture, go into Settings/Sound

INPUT = QT_INPUT

OUTPUT = QT_OUTPUT

9) In Quicktime when you’re in Screencapture, under Microphone = QT_INPUT

10) this will only capture the audio from the movie that is playing on your screen. If you want to capture your voice & ambient noise too, then add the computer Microphone to the QT_INPUT selection in Step 3 above.  better solution would be to make a separate INPUT setting for this like for Zoom calls. 

11) When you’re done recording you need to set it back to default. otherwise you can't control the volume.

Settings/Sound & select the INPUT =Microphone & OUTPUT= Speaker on your computer.

XX) the reason we installed the SwitchAudio in step4 is so that you can switch the setup On & Off using a simple Apple Script. I’ll post the script later if this topic gets any traction.