The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 18, 2008
Filed:
Dec. 30, 2003
Wenqing Jiang, San Jose, CA (US);
Jian LU, Sunnyvale, CA (US);
Gregory K. Wallace, Palo Alto, CA (US);
Peter Chou, Mountain View, CA (US);
Wenqing Jiang, San Jose, CA (US);
Jian Lu, Sunnyvale, CA (US);
Gregory K. Wallace, Palo Alto, CA (US);
Peter Chou, Mountain View, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
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.