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Definition of "P × 64" |
Video Standard: H.261, also known as the ITU Px64, which provides the specification for compressing real-time video at rates varying from 56/64 Kbps to 1.92 Mbps. H.261 covers both P x 56/64 Kbps (P = 1,2, ... 6) and M x 384 Kbps (M= 1,2,...5). The compressed video comes in two video quality modes (display formats), Common Intermediate Format (CIF) and Quarter-CIF (QCIF). The CIF provides for a 288 lines by 352 pixel picture, and the QCIF a 144 line by 176 pixel picture. Theoretically, a CIF and a QCIF can transmit video at 30 frames per second (fps) and 5 fps, respectively. But except for dedicated wire systems, as of today, no DVC system transfers video close to 30fps over ISDN. The use of an ITU P x 64 standard-based desktop video-conferencing provides ,interoperable DVC system, multiple procurement sources facilitating competitive pricing, increase product life cycle, economical long term investment. |
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