Skip to main content

Audiovisual performing with Ableton Live, Videosync and OBS on online streaming platforms

· 7 min read
Jean-Paul Grobben
Jean-Paul Grobben

In the past 10 years online streaming platforms have become increasingly popular, and as most nightclubs around the world are still closed, we are forced to find other ways to express our music to new audiences. With this first article and future articles on our blog we hope to inspire you with new possibilities and workflows that weren't possible before.

This first article will focus on the tools you can use to do an online audiovisual performance using Ableton Live, Videosync, OBS and Twitch. The online stage is still relatively new territory for musical performers, so I'm excited to share these new possibilities with you so you could do your own audiovisual performance, or simply use Ableton Live and Videosync as an the audiovisual engine for whatever you want to present online.

What you need for this tutorial:

The streaming platform

In this article we use Twitch, but Twitch is not the only available streaming platform out there. Some of the others are Facebook, YouTube and Restream. The latter can be used to stream to multiple platforms all at once.

If you don’t have an account with Twitch yet, it’s free and very easy to make one. The only thing you really need to connect OBS to Twitch is your personal Stream Key. Once you have created your account, you can find your Stream Key in the Preferences/Channel tab on the Twitch’s Creator Dashboard. Copy your Stream Key to the clipboard or a text document for later use.

Streaming key

The Twitch Creator Dashboard where you can find your Stream Key.

Live + Videosync

If you have already installed Live and Videosync, the next step will be to send Videosync's output to OBS. While setting things up as we go, it's a good idea to have a video play in Live's Session View so that we don't just see a black screen the entire time.

After having a video play in Live, open Videosync’s Preferences, go to the IO tab, and enable the Master Syphon Out option.

IO Settings

IO tab of Videosync's Preferences to enable Syphon Out.

Where Rewire allows for sending audio from one application to another, Syphon does the same for video. Once the Master Syphon Out of Videosync has been enabled, we’ll have to enable an input for it in OBS.


OBS at first startup

OBS at first startup.

When launching OBS for the first time, a blank window will appear with a number of sections with options underneath it. The first section in the bottom left is Scenes. A scene is a composition of one or multiple video Sources. When selecting a source in Sources section, handles will appear in the output screen that will allow us to reposition and resize the image.

To check if OBS receives the Syphon output of Videosync, we first have to specify a source. In the Sources tab, click on the plus icon to add a new source. About 15 options will appear; pick Syphon Client.

Syphon Client source

Add a Syphon Client source to receive video from Videosync.

A small window will popup, asking if we’ll want to add this as a New or add an existing source the selected Scene.

New source

Create as new source, or add an existing source to the selected Scene.

Once we click OK, another window Properties will open. Here we can select the actual Syphon source, and if everything went well we should see Videosync’s output as an available option.

Select Videosync

Select Videosync from the available Syphon sources.

Hit okay when you're done, and see if the video playing in Live is showing in OBS's main window:

OBS shows output

OBS now showing Videosync's output on screen.

OBS settings

Now that we have Videosync’s output coming into OBS, the next step is preparing our connection to Twitch. Go to OBS’s Settings (bottom right corner of the screen, or CMD + ,), then go to the Stream tab, select your streaming service, and paste your Stream Key.

Stream tab

Stream tab of OBS's Preferences, showing where to paste your Stream Key.

Setting up audio

By default it is not possible to output sound from Live to another application on your Mac. We can recommend Soundflower* [free] and the more advanced Loopback [free trial] for this, but in this example we will use Soundflower.

*At the Github page, scroll down until you see "JUST LOOKING FOR THE (SIGNED) SOUNDFLOWER INSTALLER?" and click the link below it. On the new page, scroll down again until you see a direct link to the latest installer file.

After setting up Soundflower, we can select it as an output device in Live's Preferences, and subsequently select that output as an input in OBS's Audio Preferences.

Audio tab

Audio tab of Live's Preferences, showing Soundflower as the output device.

Audio tab

Audio tab of OBS's preferences, showing Soundlower as input to receive audio from Live.

Ready to stream and record

Now everything has been set up, feel free to explore OBS's other Preferences tabs. It's a good idea to test out different settings for streaming or recording. Once you're ready to go on the air, hit the Start Streaming button in the main window and check Twitch if the result is the same as what is on display in OBS.

Using multiple Syphon outputs

Syphon source

When adding a new Syphon Source in OBS, Return channels of Live can now be selected as a source.

With Videosync, as of version 0.9.8, it is now possible to output multiple video signals from Live by using its Return channels. When you have this feature enabled in Videosync's Preferences IO tab, every Return channel becomes a Syphon output, and you can route video signals to these Return channels by using the corresponding Send knobs.

IO Settings

IO tab of Videosync's Preferences with Return Track Syphon out enabled.

By using multiple outputs you have the possibility to set different positions and sizes for different inputs, and increase your flexibility when it comes to combining video outputs from Live with other Sources and Scenes in OBS.

To read more about using multiple Syphon outputs, head over to the online Videosync manual.


Two separate outputs are in use in the image above. Channel 1 is beng sent to Return A. Channel 2 is being sent to Return B. Two Syphon inputs are used in OBS to receive the video signals from Live/Videosync.

Offloading video processing to another computer

It is not uncommon for streamers to use an additional computer system solely for encoding and streaming video to the internet, while using another computer system for their main activity (e.g. gaming). Similarly, if you're running a Live Set that is already heavy on the audio side, it could be a good idea to offload video processing to a secondary system. This can be done by running Videosync on one Mac while Live runs on another Mac (or PC). To read more about how to do this, head over to the online Videosync manual.


For many years artists have relied on Ableton Live's stability, workflow and ease of use for performances in front of audiences around the world, and adding video functionality to this very same workflow and even connecting it to the online stage will create more options and benefits to artists.

I hope this article could inspire you and incite some new ideas. Feel free to let us know what you think about our blog, and if there are any subjects you'd like us to cover that correlate with our field of work.