Method and apparatus for seeking within audiovisual files

Details Method and apparatus for seeking within audiovisual files Method and apparatus for seeking within audiovisual files

1997-10-09

2000-12-05

Tran, Thai

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

386 70, 386111, H04N 576

Patent

active

061577715

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.

REFERENCES:
patent: 4723235 (1988-02-01), Yasuda et al.
patent: 5809201 (1998-09-01), Nagasawa
patent: 5838872 (1998-11-01), Kawara
patent: 5999694 (1999-12-01), Yasuda et al.
patent: 6009229 (1999-12-01), Kawamura
patent: 6035092 (2000-03-01), Fujinami
patent: 6058241 (2000-05-01), Kawamura et al.

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