Quarter CIF QCIF <communications, standard> (QCIF), a {video} format standard used in videoconferencing, that transfers one fourth as much data as {Common Intermediate Format} (CIF). QCIF is defined in ITU H.261 as having 144 lines and 176 pixels per line, with half as many {chrominance} pixels in each direction. QCIF is suitable for {videoconferencing} systems that use telephone lines. The {codec} standard specifies that QCIF compatibility is mandatory, and CIF compatibility is optional. (1999-04-22)