From A for AGF Videoforschung to Z for zapping, the most important technical terms in video research are explained here.

Length weighting is a method for weighting programmes of different lengths. It is the standard method applied in calculating average performance values across multiple programmes. Each programme weighted by its length is factored into the average value. This ensures that longer programmes have a greater influence on the average value than shorter programmes.

Licensed broadcasters are broadcasters that have signed a data supply contract with AGF. AGF offers two kinds of licenses to licensed broadcasters: “system participation,” which provides access to all data available in the system, and “system-independent data supply,” which entitles the licensed broadcaster to purchase already prepared electronic reports.

Linear television refers to the sequence flow of TV contents set by the provider, such that the viewer can only watch the programmes in the same time sequence.

Linear video ads are a sub-category of in-stream video ads by which advertising messages are placed before, during or after the video content. In this case, the ad is placed linearly, meaning that it never runs concurrently with the video content. This type of video ad is further sub-divided into pre-rolls, mid-rolls and post-rolls, as well as interactive video ads.

Livestreams refer to video streaming offerings that are broadcast over the Internet in real time. Thanks to this direct transmission, users can watch different events such as soccer matches live on the Internet.

LTE is an acronym that stands for Long-Term Evolution. It refers to a transmission technology that allows for extremely fast Internet speeds and the mobile use of VoD services or video telephony. Data transmission via LTE is a widely used standard for 4G mobile networks. Similar data services based on data transmission had previously only been possible via fiber-optic lines.