Technical Description of TANDBERG Gateway with software version G2
4.4 Video Features
The TANDBERG Gateway supports the ITU video standards H.261, H.263, H.263+ and H.264.
4.4.1Optimised Video Compression
The ITU standard H.264 provides:
•Optimised compression and decompression of video at lower bandwidths.
•A sharper picture than provided by H.261 and H.263.
•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 and H.263 movement.
4.4.2Video Formats
The TANDBERG Gateway supports the following video formats:
Native NTSC: |
| |
• SIF, Source Input Format | (352 x 240 pixels) | |
• | 4SIF | (704 x 480 pixels) |
Native PAL: |
| |
• CIF, Common Intermediate Format | (352 x 288 pixels) | |
• | 4CIF | (704 x 576 pixels) |
• | QCIF, Quarter CIF | (176 x 144 pixels) |
Native PC: |
| |
• VGA, Video Graphics Array | (640 x 480 pixels) | |
• | SVGA, Super VGA | (800 x 600 pixels) |
• | XGA, eXtended VGA | (1024 x 768 pixels) |
4.4.3Asymmetric Video Formats
The TANDBERG Gateway can send and receive asymmetric video formats. This means any combination of the supported custom video formats may be sent/received to/from the TANDBERG Gateway.
Changes in the video formats during the conference are done automatically either when one of the sites changes its transmitting video format or if these formats are changed from the TANDBERG Gateway itself.
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