BlackHole

I'd say that this a missing feature from macOS that windows has had for 30 years already. I believe apple prohibits it for "security" reasons. But there are a number of open source solutions as well, I mainly use BlackHole: https://github.com/ExistentialAudio/BlackHole

Have you tried Blackhole? It’s a loopback device for macOS. https://github.com/ExistentialAudio/BlackHole

This is neat! One note: for loopback on macOS, instead of iShowU Audio Capture Device, one could also use BlackHole, which is open source: https://github.com/ExistentialAudio/BlackHole And can be installed with brew: brew install blackhole-2ch

If you want to record sound generated by the computer itself only (not the microphone), you can use a tool like BlackHole [1]. BlackHole adds a loopback audio device which can be used with the default video capture tool (select the loopback device in the options menu after pressing shift-command-5). To be able to play audio from the speakers while you're recording, you need to add a multi-output audio device in the macOS "Audio MIDI Setup" app. Switch to the multi-output device by option-clicking the audio icon in the top menu bar. Now both the speakers as well as the BlackHole audio device will receive audio. [1]: https://github.com/ExistentialAudio/BlackHole

This (commercial) program[1] does the job for Spotify. I think what it does is just play the given playlist then it sets Spotify's audio output to a virtual audio device similar to BlackHole[2], then reads from it, encodes the audio, fetches the metadata (including album art) and sets it. There are open source[3] alternatives[4] but I haven't tested them. [1] https://www.noteburner.com [2] https://github.com/ExistentialAudio/BlackHole [3] https://github.com/jwallet/spy-spotify [4] https://github.com/richardk80/spotify-ripper

The unsung hero of Blackhole is the ability to easily build a new one, meaning you can have infinite sets of audio devices with custom names. https://github.com/ExistentialAudio/BlackHole/wiki/Build-wit... Just change around some variables: `kDevice_Name`, `Manufacturer_Name`, `kPlugIn_BundleID`, `kBox_UID`, `kDevice_UID`, `kDevice_ModelUID`, and then the Blackhole.driver folder it spits out after build. You can also go up to 16 (or more?) channels instead of the stock 2, which is great for multiple participants in a jacktrip session, among other things. https://github.com/ExistentialAudio/BlackHole/wiki/Change-th... That one is slightly out of date. The new variable name is `kNumber_Of_Channels` for number of channels. You can have a dedicated Blackhole audio device for each thing you want to mix and then stitch them together into an agg

Your question seems to be covered here with some limitations. https://github.com/ExistentialAudio/BlackHole/wiki/Multi-Out...

It's a vanilla loopback Audio Server Plugin implementation, which is a userspace audio driver mechanism on macOS. Soundflower is an actual kernel-space driver using IOKit, which is the older (and deprecated) way of achieving the same thing. The actual work is done in a few dozen lines of code (see BlackHole_DoIOOperation at https://github.com/ExistentialAudio/BlackHole/blob/master/Bl...). The rest is just setting up the object model for the OS to provide metadata about the device.

> Wanna record your desktop audio as part of a screencast? It doesn't have to be a screencast, it's kind of a convoluted process regardless of which operating system you're using [1]. If I'm not mistaken OBS is using the built-in virtual loopback devices available through pulseaudio, but MacOS does not include a virtual loopback device by default, hence requiring a third party one such as Blackhole or loopback. > ...and often involves shady stuff ...what shady stuff are we talking about here? Blackhole [2] is open source software. It's about as shady as any of the (several) linux audio systems. [1] https://en.wikipedia.org/wiki/Loopback [2] https://github.com/ExistentialAudio/BlackHole

You can use [BlackHole](https://github.com/ExistentialAudio/BlackHole) for that, which is open-source, GPL-3. I do, it works, it’s great.

If you want to record your Terminal output, here's a helpful answer: https://unix.stackexchange.com/questions/396123/how-to-recor... This will let you record from your built-in microphone. If you want to record direct output, download Blackhole and route the audio through the virtual device: https://github.com/ExistentialAudio/BlackHole Audio quality will need a bit of tweaking with gain.

Is this hosted anywhere? I created https://omen.tv/ just last weekend. Similar in that it's powered by WebRTC, but it's designed for casting your screen (e.g. Jackbox Games) to other people's TVs. My greatest annoyances with WebRTC were: 1. WebRTC requires a STUN server, and despite the spec initially supporting default ICE servers, it has since been pulled out into an extension because browser vendors don't want to provide servers[1]. There are free STUN servers (Google etc.) but... 2. Double NAT clients. STUN is inevitably going to discover double NAT clients. The only way to connect these clients is through a proxy. Specifically a TURN server. Unlike STUN servers, these are not light-weight, and I can totally understand why browser vendors don't offer them by default. So inevitably any WebRTC use still requires a self-hosted TURN serve