Method and system for transcoding video data
First Claim
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1. A method comprising:
- receiving a first video data of a first type, wherein the first video data comprises compressed data that has been quantized;
determining whether a DC quantization scalar of the first video data is a predetermined DC quantization scalar; and
when the DC quantization scalar of the first video data is the predetermined DC scalar, scaling the compressed data to generate a scaled data and encoding the scaled data to generate a second video data.
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Abstract
A first method of transcoding video data is disclosed that generates a motion vector for a macroblock encoded as a dual prime macro block that has a direct motion vector, and differential motion vector for its two fields respectively. Another method of transcoding includes replacing a skipped P-macroblock that has been used to backward predict a B-Frame with a P-macroblock having a motion vector of zero. Another method of transcoding includes replacing a skipped B-Macroblock with a macroblock having a motion vector from a macroblock of the same frame of the skipped B-Macroblock that is not co-located.
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Citations
20 Claims
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1. A method comprising:
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receiving a first video data of a first type, wherein the first video data comprises compressed data that has been quantized; determining whether a DC quantization scalar of the first video data is a predetermined DC quantization scalar; and when the DC quantization scalar of the first video data is the predetermined DC scalar, scaling the compressed data to generate a scaled data and encoding the scaled data to generate a second video data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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determining an AC quantization factor for a first video data comprising compressed data that has been quantized; determining an AC quantization factor for a second video data, wherein the AC quantization factor for the first video data divided by the AC quantization factor for the second video data is an integer less than or equal to 4; scaling the compressed data by the integer to obtain a scaled compressed data; and encoding the scaled compressed data based upon the AC quantization factor for the second video data.
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18. A system comprising:
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an input to receive a first video data of a first type, wherein the first video data comprises compressed data that has been quantized; a transcoder coupled to the input, the transcoder configured to scale the compressed data to generate a scaled data and encode the scaled data to generate a second video data when a DC quantization scalar of the first video data is a predetermined DC quantization scalar; and an output to provide the second video data. - View Dependent Claims (19, 20)
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Specification