Method and system for rate control during video transcoding
First Claim
Patent Images
1. A method comprising:
- receiving, at a video transcoder, a first quantization value for a first macroblock;
determining, at the video transcoder, a second quantization value for the first macroblock based on the first quantization value, an expected amount of video data in a video buffer, and a product value of a X scaling value and a Y scaling value, wherein the product value is raised to a power of Z where Z is less than one.
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Abstract
A local system encodes previously decoded video data using a transcoding quantization value based on a source quantization value provided by a previous encoder as part of the retrieved video data. The transcoding quantization value can be determined additionally based the fullness of the video buffer of a target system, where a measure of the fullness can be obtained directly from the target system or modeled by the local system. The video data is encoded by the local system and then provided to a target system for decoding and subsequent display and/or storage.
113 Citations
18 Claims
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1. A method comprising:
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receiving, at a video transcoder, a first quantization value for a first macroblock; determining, at the video transcoder, a second quantization value for the first macroblock based on the first quantization value, an expected amount of video data in a video buffer, and a product value of a X scaling value and a Y scaling value, wherein the product value is raised to a power of Z where Z is less than one. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification