Method and apparatus for encoding digital video bit streams with seamless splice points and method and apparatus for splicing such digital video bit streams
US6049569A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1997 |
| Grant date | Apr 11, 2000 |
| Priority date | — |
| Expiry date | Dec 9, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/23424
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of encoding a digital video bit stream which includes a plurality of successively-encoded pictures. The method includes the steps of constructing a seamless In Point in accordance with a constraint expressed by the following equation (1): EQU dd.sub.f.sbsb.--.sub.ip .ltoreq.minimum {DD.sub.thr.sbsb.--.sub.ip, (B.sub.d /r.sub.n.sbsb.--.sub.ip)}, (1) where dd.sub.f.sbsb.--.sub.ip represents an amount of time by which a first byte of the digital video bit stream after the seamless In Point must stay in a decoder buffer before it is decoded; B.sub.d is a size of the decoder buffer; r.sub.n.sbsb.--.sub.ip is a bit rate at which the digital video bit stream is normally encoded at the seamless In Point; and, DD.sub.thr.sbsb.--.sub.ip represents a prescribed minimum decoding delay threshold for seamless In Points, where DD.sub.thr.sbsb.--.sub.ip is defined by the following equation (2): EQU DD.sub.thr.sbsb.--.sub.ip =((MSR/r.sub.n.sbsb.--.sub.ip)*SDD)+T.sub.p.sbsb.--.sub.i *(1-(MSR/r.sub.n.sbsb.--.sub.ip), (2) where T.sub.p.sbsb.--.sub.i is a time needed for displaying a picture which starts being displayed at a time of decoding of a last picture prior to the seamless In Point; SD…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.