2.2 Electronic Program Guide Scenarios
Today, millions of
EPGs are usually controlled and prepared by a listing service provider that controls a dedicated EPG virtual channel. Typically, the list of available programs includes only those channels
While there are a wide range of expectations from EPGs, some minimum functionality is expected. An EPG should enable at least a search grid display and detailed information display (see Figure 2.6). The search mode lists the various time slots and places in each slot a few words describing the type of program scheduled for that slot. On selection of this time slot, the viewer is presented with a detailed view of the specific program scheduled for this slot.
Figure 2.6. An example EPG
2.3 Video on Demand Scenarios
Interactivity in video distribution is increasing and new ideas for services are emerging. With VOD services,
With typical selections of hundreds of movies, a key challenge is to allow viewers to navigate and select movies. This challenge is addressed by VOD guides, whose role is similar to the role of EPGs. The movie selection process can often be abstracted into a four step process:
VOD guides could be implemented by either pushing the guide using a broadcast, or pulling the guide from the Internet through an ISP. Although the latter may introduce delayed responses, it can achieve more manageable and
2.3.1 VOD Search Applications
The viewer selects the VOD service and the list of all available movies is presented, each associated with a title, its rating, an icon of the content originator, and some short text describing its content. The Graphical User Interface (GUI) of the application provides a search panel, enabling the viewer to enter keywords. Once the search condition is entered, the list of movies is filtered to contain only those movies that match the key words specified by the viewer. The set of keywords can be iteratively refined until the viewer is happy with the list of remaining movies.
At any time during the search process, the viewer can browse up and down the list. The application should highlight a single movie selection at a time. On selection of the highlighted movie, the search application should automatically tune to the virtual channel carrying the trailer of the selected movie, effectively terminating itself and launching the trailer.
Once a movie is selected from the search results, the receiver automatically launches the trailer of the selected movie. The viewer is presented with a trailer application GUI that is launched automatically upon tuning to a trailer virtual channel. The GUI layout could be divided into three sections: title at the top, trailer to the left, and preview to the right. The title is a horizontal section across the top of the screen. The trailer section is further divided into two horizontal
In its simplest form, the trailer application is resident at the receiver and only the data it uses is broadcast; a more complicated scenario
The VOD concept