Video Features
Polycom, Inc. 45
Forward Error Correction
The Polycom Trio system supports Forward Error Correction (FEC) DV0 and DV1 with Skype for Business
Server 2015, Skype for Business 2015 client, and Lync 2013 environments for H.264 SVC. The scheme
introduces recovery packets on the transmitter which recover lost video packets on the receiver.
FEC performance and quality improvements with this release may vary depending on network conditions.
Use the parameter
video.codecPref.XUlpFecUC
to set the forward error correction codec priority.
Video Simulcast
Polycom Trio systems registered Skype for Business can simultaneously send a low resolution video stream
and a second higher-resolution video stream to conference participants in a Skype for Business AVMCU
meeting. Simulcast is enabled by default.
Skype for Business AVMCU-based video meetings are driven by endpoint requests to receive video called
a video source request (VSR). The VSR specifies the resolution (among other constraints) and the
participant(s) whose video the endpoint would like to display. The requested resolution in Skype for
video.conf.displayLayout.PIP.peopleMode
video.cfg
Choose what the PIP screen displays.
selfView (default) - Display your own video.
recentTalker - Display video from the current or
most recent talker.
video.conf.galleryView.overlayTimeout
video.cfg
Set the timer for the participant name overlay on
the Visual+ monitor when using the Gallery View.
0 (default) - The overlay does not time out.
0 - 60000 ms
video.conf.displayLayout.autoPreference
video.cfg
The system automatically chooses the best layout
mode for video call
Gallery (default)
PIP
FullScreen
Forward Error Correction Parameters
Temp l at e Parameter Permitted Values Change Causes Restart or
Reboot
video.cfg video.codecPref.XUlpFecUC
Set the forward error correction
(FEC) codec priority.
8 (default)
0 - 8
No
Video Layout Parameters
Parameter
Temp l at e
Permitted Values
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