Progressive video refresh slice detection
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United States of America Patent
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Nov 6, 2007
Grant Date -
Aug 21, 2003
app pub date -
Nov 25, 2002
filing date -
Jan 2, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A selective encryption encoder and method of dual selective encryption and detection of intra-coded slices in video content. The selective encryption encoder has a packet identifier that identifies packets of at least one specified packet type, the at least one specified packet type being packets in a set of N consecutive slices in a frame wherein the a second byte after a slice start code is identical in all N consecutive slices. A packet duplicator duplicates the identified packets to produce first and second sets of the identified packets. The packets are sent to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method. A secondary encrypter encrypts the second set of identified packets under a second encryption method.
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