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Abstract

Method and apparatus for encoding instantaneous decoder refresh (IDR) units are disclosed. The method includes partially encoding an IDR block as a non-IDR block, decoding the partially encoded IDF block to generate a reconstructed IDR block and fully encoding the reconstructed IDF block as an IDR block. In a first pass, an IDR unit is partially encoded (no entropy encoding) using regular encoding parameters of a non-IDR unit in the same picture. The partially-encoded IDR unit is then inverse quantized and inverse transformed to generate a reconstructed video data of the IDR unit. In the second pass, the reconstructed video data of the IDR unit is passed as an input to the prediction module and fully encoded using the IDR settings. The reconstructed IDR unit may be encoded with very high fidelity.

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First Claim