| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-fidelity transcoding technique. SOLUTION: A video transcoder obtains re-coding data set elements for source format compressed video and uses the elements for coding decisions and/or equivalent parameters, when video is compressed into in a target format. This allows syntax elements and coding decisions to be maintained across the two formats, including the picture types, intra/inter macroblock coding types, field/frame coding decisions, and/or quantization levels. This helps the transcoder match the quality in the compressed video between the source and target formats, reducing transcoding losses. At the same time, the transcoder can add compression to reduce the overall bitrate. The transcoder may apply proportional rate control so as to produce an output at a constant or relatively constant bitrate. COPYRIGHT: (C)2006,JPO&NCIPI |
