Intelligent packet loss recovery, Inband changing of video and audio algorithms, Transcoding and ratematching – TANDBERG Media Processing System MPS 200 User Manual
Page 160: Intelligent packet loss recovery (iplrtf), Other features (2:2)
D 13373.08
NOVEMBER 2007
MPS
TANDBERG
MPS
ADMINISTRATOR GUIDE
Intelligent Packet Loss Recovery (IPLR
TF
)
IPLR is an ITU standard based packet loss compensation for
H.323 that improves received video into the TANDBERG MPS.
IPLR supports all video protocols and resolutions that TAND-
BERG MPS already has implemented and is compatible with all
terminals and Gateways. This method works with other vendors’
endpoints as well as MCUs. Video quality is improved on the
transmitted and received video streams.
IPLR is a special algorithm developed at TANDBERG that will
make efforts to reconstruct the lost packets and reduce the
visual effects caused by packet losses.
If the TANDBERG MPS experiences packet loss from an
endpoint, it will ask the endpoint to handle packet loss. This
requires Intelligent Packet Loss Recovery functionality on the
endpoint.
Please see Whitepaper TANDBERG and Packet Loss on
for details on the IPLR
TF
feature.
Intelligent Packet Loss Recovery
Inband Changing of Video and Audio Algorithms
TANDBERG MPS is able to change its video and audio algo-
rithms ‘on the fly’ during a conference. This is valuable when
switching between the live user image (CIF) and the live PC
(XGA, SVGA, VGA).
Transcoding and Ratematching
Audio:
Transcoding: Each of the sites is negotiating the audio algorithm
individually. So in a Multipoint call we support any combination of
all the supported audio codecs (G.711, G.722, G.722.1, G.728,
MPEG-4 AAC-LD). The same goes for ratematching, any combina-
tion is supported.
Video:
All sites are divided into groups of similar coding (H.261, H.263
and H.264) and rate capabilities. The number of groups and their
properties depends on the sites connected to the conference.
During a conference call, group properties might change, and
also sites might move between groups.
Transcoding and Ratematching
Inband Changing of Video and Audio Algorithms
Other Features (2:2)
Features
160
Introduction
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