Method and system for multiple pass video coding
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United States of America Patent
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Nov 30, 2010
Grant Date -
Sep 18, 2008
app pub date -
Jun 2, 2008
filing date -
Sep 17, 2003
priority date (Note) -
Expired
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Abstract
A real-time MPEG video coding system with information look-ahead for constant bit rate (CBR) applications, such as, for example, Video-on-Demand (VoD) over ADSL. This scheme employs two MPEG encoders. The second encoder has a buffer to delay the input by an amount of time relative to the first encoder to create a look-ahead window. In encoding, the first encoder collects the information of statistics and rate-quality characteristics. An on-line information processor then uses the collected information to derive the best coding strategy for the second encoder to encode the incoming frames in the look-ahead window. The second encoder uses the encoding parameters from the processor as the coding guide to execute the coding strategy and generate the final bitstream.
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