Video/graphics integration
Many DTV receivers have a limited range of capabilities when it comes to supporting video and graphics. The HAVi UI model, with its separate devices for video, background and graphics, reflects these capabilities to some extent, but there are elements that digital TV developers need to be aware of. If you're not an experienced developer of STB software, these limitations may not be obvious at first.
A set-top box is not a PC
In a typical PC platform, video and graphics are all rendered in software (even if the video is decoded in hardware, the rendering is usually handled by software). This makes life easy when it comes to scaling and positioning video - since everything is done in software, the video is just like any other content that can be scaled, clipped and repositioned. Since it's just another piece of data to be rendered, it's easily integrated into the windowing system and coexists easily with the graphics as long as the host CPU is fast enough.
InteractiveTvWeb.Org
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