Technical Description of TANDBERG 8000 with software version E3/B8
D12008 Rev. 11
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4.4.6
Optimized Video Compression
The ITU standard H.263 provides:
•
Optimized compression and decompression of video at lower bandwidths.
•
A sharper picture than provided by H.261.
•
Improved contrast and enhanced clarity of the finer details within an image.
•
Improved motion handling that removes the characteristic blocking that tends to occur during
normal H.261 movement.
•
Near broadcast quality motion handling (iCIF/iSIF) is achieved with the implementation of
certain H.263 annexes, commonly referred to as H.263+ (annex N) and H.263++ (annex W).
•
4xCIF/4xSIF live video
The ITU standard H.264 provides considerably better video quality at lower bandwidths. It has
been developed with strong TANDBERG participation in joint workgroups of ITU-T and ISO.
H.264 is based on the ISO standard MPEG-4.
The TANDBERG 8000 system supports H.264 video compression in both CIF and SIF
resolutions
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. An encoding and decoding rate of a high-quality 30fps is achieved. H.264 may be
used on the TANDBERG 8000 system for bandwidths of up to 768 kbps.
Under the preconditions named above and depending on the far end’s H.264 support, the
TANDBERG system will select H.264 as video compression standard if H.264 has been
activated in the menu.
In case H.264 is unavailable at the far end or if the above preconditions are not fulfilled, the
TANDBERG system will preferably select H.263.
The TANDBERG system will select H.261 only in case the far end system supports no better
video compression algorithm.
4.4.7
Intelligent Video Management (IVM)
It is possible to configure the picture sent from the system depending upon specific requirements
and applications adding an additional level of flexibility and adaptability:
Generally, the IVM will always try to transmit the format closest to the video input format.
Motion:
When there is a need for higher frame rates, typically when a large number of
participants are present or when there is a lot of motion in the picture.
At low bit rate:
•
CIF will be used from a PAL video input
•
SIF from NTSC
•
VGA/SVGA/XGA from PC,
Digital Clarity
At high bit rate:
•
iCIF will be used from a PAL video input,
Natural Video
•
iSIF from NTSC,
Natural Video
•
VGA/SVGA/XGA from PC,
Digital Clarity
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H.264 only supported from software E2 onwards
