TABLE OF CONTENTS This chapter provides a brief overview of several families of video standards. Then it goes into some detail about ITU-T Recommendation H.261, an established teleconferencing video standard, and Draft ITU-T Recommendation H.263, a new teleconferencing video standard. A brief overview of MPEG-4 is found in Section 2.5.
Table 19.1 presents an overview of several families of digital video standards. The umbrella name is listed in the left column. Some of the standards in the family are listed by number in the center column and the purpose of each standard is shown in the comments column. This table illustrates how multiple standards are needed to create a complete video application.
| Umbrella name | Related standards | Comments |
|---|---|---|
| px64 | H.261 | Video |
| H.221 | Communications | |
| H.230 | Initial handshake | |
| H.320 | Terminal systems | |
| H.242:1993 | Control protocol | |
| G.711 | Companded audio (64 kbits/s) | |
| G.722 | High quality audio (64 kbits/s) | |
| G.728 | Speech (LD-CELP @ 16 kbits/s) | |
| LBC | H.263 | Video |
| H.324 | Terminal systems | |
| H.245 | Control protocol | |
| H.223 | Multiplexing protocol | |
| G.723:1995 | Speech (5.3 & 6.3 kbits/s) | |
| American TV | A/52 | Audio (up to 448 kbits/s) |
| A/53 | HDTV terrestrial transmission | |
| A/54 | HDTV receivers | |
| A/55 | Program guide | |
| A/56 | HDTV transport layer | |
| IEEE 802 | Cable TV | |
| CableLabs WG | Satellite & Cable transmission | |
| European DVB | ETR 154 | Video (MPEG-2) |
| DVB-SI | Transport | |
| DVB-C | Cable transmission | |
| DVB-S | Satellite transmission | |
| DVB-CS | SMATV distribution system | |
| DVB-T | Terrestrial transmission | |
| DVB-TXT | Teletext in DVB bitstreams | |
| DVB-CI | Common Interface | |
| DVC | ISO | Digital video cassette (6 mm) |
| MJPEG | JPEG | Still image compression |
| ODC | Wrapper |
