US Patent 7346106 Robust multi-pass variable bit rate encoding
Patent 7346106 was granted and assigned to Apple (company) on March, 2008 by the United States Patent and Trademark Office.
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An encoding manager performs a first-pass encoding of a video sequence, collecting modeling data concerning the sequence in the process. The encoding manager utilizes collected data to construct a model concerning the sequence, the model including bit overhead for each frame and data concerning transitions that occur during the sequence. The encoding manager uses the data model to generate a rate profile for the video sequence, avoiding buffer underflow by allocating bits from hard to easy segments as needed. The encoding manager utilizes the rate profile to perform a second-pass encoding of the video sequence, adjusting quantization and bit rate for frames as necessary to avoid underflow and conform to the bit budget for the video sequence.
US Patent 07346106 Robust multi-pass variable bit rate encoding US Patent 7346106 Robust multi-pass variable bit rate encoding
US Patent 07346106 Robust multi-pass variable bit rate encoding
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