Generation of MPEG slow motion playout

Details Generation of MPEG slow motion playout Generation of MPEG slow motion playout

2005-12-27

2005-12-27

Philippe, Gims (Department: 2613)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C386S349000

Reexamination Certificate

active

06980594

ABSTRACT:
MPEG coded video data includes groups of pictures (GOPs). Each group of pictures includes one or more I-frames and a plurality of B- or P-frames. To produce an MPEG slow-forward coded video stream, the coding type of each frame in the MPEG coded video data is identified, and freeze frames are inserted as a predefined function of the identified coding type and as a predefined function of a desired slow down factor. In a preferred implementation, for a slow-down factor of n, for each original I- or P-frame, (n−1) backward-predicted freeze frames are inserted, and for each original B-frame, (n−1) copies of the original B-frames are added, and a selected amount of padding is added to each copy of each original B-frame in order to obtain a normal play bit rate and avoid video buffer overflow or underflow.

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