| 摘要 |
Disclosed herein are representative embodiments of methods, apparatus, and systems for manipulating bitstreams of digital media data compressed according to a compression standard. Also disclosed are representative embodiments of methods, apparatus, and systems for evaluating compliance of an encoded bitstream of digital media data with a compression standard. In one exemplary embodiment, a conforming bitstream of compressed digital media data is input. One or more of the parameters in the bitstream are selectively altered into parameters that do not conform to the video compression standard. The selective alteration can be performed such that parameters that would make the bitstream non-decodable if altered are bypassed and left unaltered. A non-conforming bitstream that includes the one or more selectively altered parameters is output.
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