Method and apparatus for seeking within audiovisual files
US6157771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1997 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Oct 9, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/8042
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed are methods and apparatuses for seeking within audiovisual files. A seeking engine is implemented to efficiently locate target video frames without having to laboriously decode and index each and every video frame in an audiovisual file. Further, a seeking engine is capable of frame accurately determining the number of frames in a video file by identifying the last GOP header in the video file, and then identifying a last video frame in the file. The last video frame in the file is identified by reading each video frame's picture header (i.e., within the last GOP) and determining which picture header produces a larger temporal reference number. The video frame having the largest temporal number is therefore the last video frame in the video file. In addition, the seeking engine is capable of associating an identified video frame with a closest audio frame to complete an audio-to-video seek.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.