Dual Stream (Duovideotf/H.239) - TANDBERG 770 MXP User Manual

D1335603_T770_880_990_MXP_User_Manual

3.11.5 Dual Stream (DuoVideoTF/H.239)

(Optional feature)
With Dual Stream you have the opportunity to show two different live video streams
simultaneously, main video and one additional source. This is handy when showing a
presentation. You see the live presentation and the live video of the presenter simultaneously.
When you start a presentation, Dual Stream starts automatically if both local and remote system
supports DuoVideo/H.239. If one of the systems does not support DuoVideo/H.239, no second
video stream will be established and your presentation will be shown as your main video.
DuoVideo/H.239 is available on all systems with Natural Presenter Package installed. H.239 is
the new ITU standard defining how to send two video sources simultaneously.
Example:
Start a meeting with main camera as video source. Press the presentation key on the remote
control to start a PC presentation.
PC will appear as DuoVideo in addition to main camera. End the DuoVideo presentation by
pressing presentation key again.
In Presentation Settings (see 4.3 Presentation Settings), you can put DuoVideo to Manual. That
means that DuoVideo will not start automatically.
Example:
Start a meeting with main camera as video source. Press the presentation key on the remote
control to start a PC presentation.
A dialog box appears where you can choose to show PC as DuoVideo or not. This is handy if
you not always want to use DuoVideo.
DuoVideo/H.239 and Bandwidth
Using DuoVideo/H.239, the quality will automatically downspeed to the optimal bandwidth. This
means that you need higher quality to allocate enough bandwidth for the two video streams.
DuoVideo/H.239 borrows bandwidth from main video. When DuoVideo is closed, the bandwidth is
returned to the main video.
Controlling camera, changing video source and camera presets in a DuoVideo call.
When selecting the Document Camera or PC, the system will automatically request floor when
connected to a MCU conference as MultiSite host or connected to an external MCU.
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