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OSD with DVR RDK

ranchu
Guru 20755 points

Hello,

In dvr rdk "DM81xx_DVR_RDK_Software_OSD_Text_Render_Notes.pdf" it is said "Blending would not be supported. Only transparency is available". What's the difference between Blending and transparency  ? Why is it said that blenidng is not supported , it is yet included in ineterface (globalAlpha) ?
Anothing thing, it is said "Presently OSD code supports drawing up to 4 windows per stream."
What does it mean that OSD windows are drawed on stream, isn't is drawed on certain channel ?
There is also ALG_LINK_OSD_MAX_WINDOWS  which is maximum number of OSD windows per frame ? so are maximum OSD windows are per stream or per frame ?

Thanks,

Ran