La synchronisation d’écrans intervient dans un contexte de diffusion de contenus multimédias sur des écrans via un logiciel. Elle s’applique notamment lors d'installations d'écrans d’affichage dynamique et c’est ce qui fera l’objet de ce post. Si vous ne maîtrisez pas la notion d’affichage dynamique, consultez notre article bien comprendre l’affichage dynamique.
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Bien qu’il comporte plusieurs significations (chaque prestataire s’approprie le terme de “synchronisation”), le terme "synchronisation d’écrans" se réfère en règle générale à la possibilité de diffuser un contenu sur plusieurs écrans qui partagent une échelle temporelle commune. Le contenu peut être identique ou différent selon les besoins. Les contenus sont alors diffusés en même temps grâce à un logiciel d'affichage dynamique intelligent. (dans le cadre de scénarios visuels plus élaborés, les déclenchements des diffusions peuvent différer). C’est cette définition qui sera considérée dans le reste de l’article.
Synchronous content can be broadcast using a variety of systems. However, not all of them are suitable for all types of screen synchronization: the technical choice must therefore be made in accordance with the desired rendering objectives. The main types of synchronization are listed below, and detailed in the rest of the article, after a reminder of commonly installed devices.
- Different installation techniques
- Identical" synchronization
- Extended" synchronization
- Hybrid" synchronization
- Synchronisation “interactive” - la technologie Cenareo
Different screen installation techniques
Most of the installations used can be summed up in the 4 cases illustrated below.
Tous les écrans sont directement connectés sur le player. Bien que cette solution soit simple à installer et ne nécessite qu'un player, la plupart des players ont un nombre limité de sorties vidéos. Ils sont également coûteux.
All screens are connected to a "splitter", which in turn is connected to the player. The splitter duplicates the player's content via numerous video outputs, and has the advantage of being able to be chained. They are also relatively inexpensive.
All screens are chained together, and the first is connected to the player. The screens must be identical and offer this functionality. The screens must also be close enough together to avoid excessive cable length, which could reduce image quality.
Chaque écran est connecté à un player différent. Ce sont les players, en communiquant entre eux, qui synchronisent les contenus sur les écrans. Cette solution implique d'avoir autant de players que d'écrans, ce qui peut être coûteux, suivant les players utilisés.
→ Read the example of VandB synchronizing 110 screens for the surprise announcement of its Music Festival!
Identical synchronization (cloned, replicated, duplicated, etc.)
In this installation, the same content is replicated as many times as there are screens equipped. Each piece of content is shown simultaneously on the equipped screens.
In the same way that a laptop can replicate its content identically on an additional screen, it is possible to replicate the same content on several screens located nearby. The screens thus configured display exactly the same content at exactly the same time.
For optimum image quality, the resolution of the original content must be equal to that of the screen offering the best resolution.
This configuration offers little interest when used on a wall of screens, since the content is repeated as many times as there are screens. On the other hand, it is frequently used in stations and shopping malls, where multi-sided totems are commonplace.
The faces of the totems, or even all the screens in a zone, are synchronized identically, displaying the same content at the same time (for example, checkout lines in a supermarket). This configuration offers the advantage of being able to share the broadcast player between several screens, thus increasing the surface area without increasing the number of display players required.
The most common installations for this type of synchronization are :
- A player with numerous video outputs
- A splitter that duplicates the signal
- A chain of screens
- A player behind every screen
Extended synchronization
In this installation, content is fragmented into as many parts as there are screens equipped. Each fragment of content is broadcast simultaneously on the screens. Together, the screens reform the initial content. The layout of the screens therefore plays an important role.
In the same way that a laptop can extend its content onto an additional screen, it is possible to fragment content onto several adjacent screens. The screens thus configured display part of the same content at exactly the same time.
For optimum image quality, the resolution of the original content must be such that it is possible to "pick out" distinct parts with a resolution at least equal to that of the screen displaying the content fragment. (For 4 1080p screens, original content in 4K is recommended.) What's more, screens need to be close to each other, and thespace between screens needs to be tight for the rendering to be ideal.
This configuration is widely used for screen walls. The content is then broadcast over a large surface, increasing its visibility. The screens can be played with to match the decor, or to make the most of the video's features. This installation is often acclaimed for the gigantic scale of the images broadcast, the resulting animation of the site and the crowds it attracts.
The most common installations for this type of synchronization are :
- A player with numerous video outputs
- A chain of screens
- A player behind every screen
Hybrid synchronization (multi-channel)
In this installation, several different pieces of content, generally of the same duration, are shown simultaneously on the equipped screens. This may be radically different content, content relating to the same theme, or parts of the same original content.
This configuration can be used to attract attention, with giant content displayed on all screens, followed by multiple contents, each displayed on a screen and broadcasting other information. Used in stations, this system can be used to display promotional or informational content on all screens (giant content), followed by the departure, arrival or delays of the next trains.
The most common installations for this type of synchronization are :
- a player with numerous video outputs
- screen chaining
- a player behind every screen
Interactive synchronization
In this installation, screens broadcast content, synchronized or not, of the same duration or not. And on request (connected button, smartphone, url call, API...), content (replicated or fragmented) is broadcast on all or some of the equipped screens.
Perfect for attracting attention thanks to the possibility of equipping walls with screens, this installation also makes it possible to involve an audience who, as actors in triggering the broadcast, will be more receptive to the messages displayed. This installation enables triggers (connected buttons, user smartphones via QR Code, for example) to be used as remote controls. This remote control makes it possible to control the display of content on multiple screens, and thus to synchronize screens on demand. In addition to the advantages of screen walls, this device adds the benefits ofinteractivity.
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Découvrez le logiciel Cenareo pour vos contenus multi-écrans
Notre logiciel d'affichage dynamique offre une solution Saas intuitive, évolutive et parfaitement adaptée aux besoins des professionnels de la communication de tous secteurs d'activité : Points de vente, Communication interne, Hôtellerie et Restauration mais aussi DOOH.
Son Player pour affichage dynamique Plug & Play permet de connecter n’importe quel écran en quelques secondes, et le reste se passe en ligne. Depuis une interface web, il est possible d’ajouter images, vidéos ou documents depuis son ordinateur, en créer via un outil de création de contenu développé pour le système d'affichage dynamique. Il est également possible d'intégrer des applications tierces pour diffuser des contenus externes en temps réel ou non.
La technologie de synchronisation interactive développée par Cenareo permet de déclencher, instantanément et sur demande, du contenu synchronisé sur un mur d’écrans. Un capteur de température, un bouton connecté, ou un scan de QR Code peuvent déclencher la diffusion de contenu sur un parc d'écrans, en moins de quelques secondes…
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