Multiple speed fast forward/rewind compressed video delivery system
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United States of America Patent
Stats
-
Dec 4, 2001
Grant Date -
N/A
app pub date -
Mar 10, 1998
filing date -
Mar 10, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention supports visual fast-forward play and rewind at multiple speeds using a single ancillary data stream. The storage required by this data stream is approximately the same as the storage required by a single ancillary data stream used in conventional single speed fast-forward and rewind schemes. The method of the invention includes the following steps. A bitstream of the original sequence of MPEG compressed pictures is stored for normal play. Then a sub-sequence of the original sequence, consisting of every n-th picture, is compressed as I-pictures, while ensuring that all pictures in the compressed stream have equal numbers of bits. This is the ancillary stream. A client request for fast-forward play is responded to by transmitting a subset of I-pictures from the ancillary stream. A fast-reverse play request is satisfied in the same manner except that the I-frames are transmitted in the reverse order.
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Cited Art Landscape
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