L'analyse de votre flux vidéo avec PlutoDVB
We need to send a video stream to the PlutoDVB integrated server. It is possible, for example, to stream an image directly from a smartphone with the Larix Broadcaster software. I don’t develop this support, but if you are interested, you can find an example of configuration on the PlutoDVB integrated help page (in the Phone section). It seems much more interesting to me to present the software I prefer to use to transmit my DATV images: OBS Studio.
OBS Studio (Open Broadcaster Software) is a free open source software that allows to compose video images, and to broadcast them to internet platforms like Youtube or twitch for example. It is often used by gamers who broadcast their game live.
This software is really flexible with an intuitive interface and allows you to compose your images, with multiple video sources (webcam, internet), audio, still images, scrolling texts… filters allow you to process, modify the video and audio, transitions allow you to switch from one composition (scenes such as the software calls them) to another. Plugins allow to add interesting functions. The only limit I see will be your inspiration.
Our first test pattern in OBS Studio
To familiarize ourselves with the software, and after having installed OBS Studio, we will build our first Scene, to broadcast a customized TV test pattern. Let’s see it step by step.
- Download and install OBS Studio
- Launch the software for the first time. Answer No to the Auto-configuration question. Your installation is initialized with a default profile, in which an empty scene is placed.
- The first thing to do is to adjust the definition of your broadcast screen. Click on the File / Settings menu. Go to the Video screen, and set your basic resolution, and output resolution (the same as above). Broadcasts and screens are now largely in 16:9 format. Validate by OK
- We’re going to rename the first Scene to “Mire” (french for TV-Pattern) so that we’ll be able to find our way around when we have more Scenes added. Right click on the scene, choose Rename. I’m entering “Mire” (Pattern).
- Now let’s add an image to the Scene, by clicking on the plus sign and choosing the Image source.
- Name your image “Mire TV”. Click OK
Select your image. You can download the file Mire-TV.jpg. Click OK.
- Using the red handles, resize the image to the width of the scene. When the final position is found, lock its position by clicking on the padlock of the TV test pattern source. This will avoid moving the image inadvertently afterwards.
- We’re now going to add your call sign to the pattern. With a click on the plus, add a Text(GDI+) source. Proceed as in the first case, to name the source. In the properties window, you can define a font, the color of your choice. Enter your callsign in the Text field. Click OK. The text is added to your scene.
- Take care that in the list of sources, your text is well listed above the background image. Indeed, the order of the sources defines the overlay layers in the scene. Resize your text.
- We still have to add sound to the pattern. You will now choose a Media source, and name it Background Music for example. Accepted audio formats are mp3, acc, ogg and wav. In the properties of the source, remember to check Loop so that the music keeps restarting. I invite you to check the license conditions of your audio sources before integrating them into your broadcasts. Here are a few platforms that you can use to find your music.
- Your first static TV pattern scene is complete. You will quickly understand that you can add other scenes with sources that can be a USB camera, or a network camera. The sources to use are ‘Video capture device’. You will also be able to make captures of your applications, or of your desktop directly thanks to the source ‘Window Capture’ or the source ‘Screen Capture’. For audio, to add a microphone, you will use the ‘Audio Capture (input)’ source.
- Following the same principle, you add another composition, another scene, for example to integrate a webcam connected to your PC :
- Click on the + at the bottom of the Scenes column. Give a name to the new Scene
- Click on the + at the bottom of the Sources column. Choose “Video capture device”, then choose your connected video source
- You can also integrate in the scene a network image source (Media Source), for example the one of the broadcast made by your DATV reception (Minitiouner for example). Uncheck Local file, and enter the source IP address for example udp://@188.8.131.52:10001. You can also use a smartphone equipped with a camera to stream your video. Under Android, I use the software Droidcam or IP Webcam.
- I invite you to switch to the “Studio Mode” view (via the bottom right control button).On the right is displayed the image sent (streamed), and on the left, the scene you are ready to send.
- To switch from one scene to another, select the scene to be transmitted, then click on one of the “Transition” buttons positioned between the two images. You will choose one of the available transitions (Cut, fade, scan …). The transitions are configurable in duration and rendering with the Scene Transitions / Priorities panel, or by adding a transition with the + button.