As you already know, we of Immotionar re organizing a small event here in Turin about VR & AR, called Disruptive Technologies Conference. Since we’re sold out, we’re planning to create a live stream of the event, to show our fantastic talks to people that can’t attend it. This means that we’ve also to stream our virtual reality demo game, with its audio and video on the same PC where we stream the seminar slides and the speaker talking… but, how to stream all this correctly?
After some tries, we got this solution. First of all, you have to create a Youtube live event or live streaming, as described in this guide. It’s not that hard, you just tell Youtube you want to start a live stream, then select when to start the event, if you want it to be public or not (if you just want to make a try, please set is as Private) and customize all stream features. Notice that to start a live stream you should have a Youtube verified account (so you have to provide Google your phone number or use some dirty hacks). Once the live stream has started, you will notice that Youtube says that it is still offline. The reason is that your stream is technically on, but there is actually nothing sending data to Youtube.
To start the stream, you’ll have to use some recording/streaming software, among which I use OBS (Open Broadcaster Software), because it’s good and it’s free (and open source). OBS interface is pretty simple: in its GUI you can see a great panel with the preview of what will be sent to the stream (the big panel), with under that the controls to set what to stream.
Right click the “Scene” panel and add a new scene. Then select the scene, go to the “Sources” panel and select “Monitor Capture”. Right click the newly created capture and select “Properties” and choose the main monitor from which you want to stream. Here the concept is pretty simple: we’ll launch an Oculus game, which will mirror on the main screen of my PC. OBS will take this mirror and will stream it to your Youtube live broadcast. If you made everything the right way, you should see the preview of OBS showing the actual content of your screen (if it is the same screen of OBS, you should see that strange endless loop image as above). If you want, OBS is customizable enough to compose different video sources in a single stream: we use it to stream the video composed of the player moving in front of the Kinect (of our ImmotionRoom system) and the visuals of the game.
To make this, just add more “Sources” to the same scene and select the portion of the image area that each source should occupy in the output stream, modifying the red handles of the source in the preview window that appear when you select that particular source.
Ok, enough for the visual part. Let’s switch to the audio now. Take a look at the lower Mixer panel and configure which audio has to be streamed. Take care to go to the settings of the Desktop Audio section and select which output device audio has to be included in the stream. If you just want to play the audio of the Rift game, selecting Rift Headphones should be enough, but if in your live stream you want also to show other stuff (e.g. a video played with VLC), it’s better that you re-direct your Rift audio to the windows main playback device (as we have seen yesterday) and then select this device as the audio source for OBS. If you want, you can also modify Mic settings to the stream, so that you can also voice over while you play!
If you are here, you have all your stream correctly set. You have only to say to OBS to stream to Youtube. So, click on the main Settings button and select the “Stream” tab. Say to OBS that you want to customize your streaming server and copy as settings the ones that you find in your offline live streaming page on Youtube.
Confirm everything and then start the streaming in OBS! At this point, after some seconds, you Youtube stream should figure as “online”: minimize OBS window (or move it away from the screen being captured) and start making your live stream: start some VR games and play them, with your public seeing everything you’re doing. You can also talk, play music and video… and everything will work like a charm!
The stream should have circa 10 seconds of delay from your live performance but it should be all right. And that’s all… hope you liked this short tutorial…if it is so, please like and share this article!
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