Method and system for providing instant reverse play
US7471875B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 2005 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Aug 7, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/783
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for displaying video data instantly in reverse order is disclosed. According to the method, a compressed audio and video (A/V) stream is received from a source. The compressed A/V stream is demultiplexed into an audio stream and a video stream. The video stream has a number of compressed video frames which include a number of key frames. Each key frame is followed by one or more associated frames. Each of the compressed video frames is tagged with a tag. The tag associated with each key frame and file position of each key frame is stored in a table. The compressed video frames are decoded to generate a number of decoded video frames while maintaining their corresponding tags. During normal play, the decoded video frames are stored in a forward queue, and the decoded video frames in the forward queue are then outputted in a FIFO (first-in-first-out) order to a reverse queue and a display device for display. The reverse queue operates in a FIFO manner by discarding the oldest decoded video frame stored in the reverse queue when the reverse queue is full. During reverse play, the tag of the oldest decoded video frame in the reverse queue is recorded when a reverse play comman…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.