Video conferencing images are made from dynamic macroblocks
720p HD is defined as:
1280 horizontal pixels
720 vertical pixels
Video conferencing should support 30fps for business quality motion handling
16 pixels 16 pixels Macroblock
Dynamic Macroblocks Needed for 720p, 30fps?
How many dynamic macroblocks per second does an HD video conferencing system need to en co de and dec ode?
1280h x 720v = 921,600 pixels per frame 921,600 ÷ 16h ÷ 16v = 3,600 macroblocks per frame 3,600 x 30 = 108,000 macroblocks per second 108,000 macroblocks/second
What Does TANDBERG Provide?
TANDBERG cannot co de and dec ode full HD video due to limited dynamic macroblock (video building blocks) capability
400p 720p HD Standard Non-Standard 448p
Limited macroblock capability forced TANDBERG to non-standard (lower resolution, non-HD) formats where they could dynamically co de and dec ode at 30fps
Fully Dynamic Video at 30fps Maximum Dynamic Macroblocks
Video Formats and Dynamic Macroblock Requirements
Static Macroblock technology was developed by Polycom
This technology was designed to improve frame rates for content sharing, where images had small changes
Reducing the dynamic macroblocks reduces the workload placed on the codec.
If you are struggling to achieve higher frame rates, this is one way to push up that number.
However, this comes at a price. When you rely on static macroblocks and real motion takes place, the video quality suffers with video blurring, blocking and unnatural motion caused by drops in frame rate
TANDBERG and Static Macroblocks
Makes their frame rate statistics look higher when there is very little motion
Environments with motion suffer as frame rates drop:
People moving in the video image
Camera movements (panning, tilting, zooming)
Switching to alternate video sources (DVD, VCR, 2 nd camera)
TANDBERG systems will not negotiate with other vendors that support full dynamic macroblocks
Why? Codec is underpowered to deliver true HD (108,000 macroblocks per second) and can not fully co de and dec ode
Will force real, dynamic HD systems to drop down to 4CIF or lower where they can handle dynamic decode
High definition video conferencing is a very specific science and well-defined
TANDBERG does not meet this definition
In order to compensate for not delivering true, dynamic HD, TANDBERG uses Static Macroblocks to reduce workload on its video conferencing codecs and claim higher frame rates
Polycom HDX 9000 solutions deliver true HD at 30fps, even in highly dynamic environments