A New Merit Version for Mpeg-2 Encoded Files a New Merit Version for Mpeg-2 Encoded Files a New Merit Version for Mpeg-2 Encoded Files 2 Merit 3.3 2.1 System Overview 2.3.1 Mpeg Bit Stream Parsing 2.3.2 Storing Mpeg Information

The MPEG Encoded Retrieval and Indexation Toolkit (MERIT) performs video segmen-tation of MPEG les in the compressed domain, using an algorithm based on macroblock type statistics. It was written in C by V. Kobla in 1995 for his doctoral work at the University of Maryland. Kobla's code dealt with MPEG-1 les only. In this report we update MERIT to analyze MPEG-2 les as well. We modify the le parsing process to account for the MPEG-2 speciications. We account for the new motion compensation modes introduced by MPEG-2 in preliminary computations, generating data structures that allow the original MERIT segmentation algorithm to work properly. A series of tests connrmed the validity of our solutions. The new version 4.0 of MERIT is a superset of MERIT 3.3, insofar as it gives the same results for MPEG-1 les, and is able to analyze MPEG-2 les using almost all the available options. Further improvements could be made to address key-frame storage and higher chrominance formats. Abstract The MPEG Encoded Retrieval and Indexation Toolkit (MERIT) performs video segmen-tation of MPEG les in the compressed domain, using an algorithm based on macroblock type statistics. It was written in C by V. Kobla in 1995 for his doctoral work at the University of Maryland. Kobla's code dealt with MPEG-1 les only. In this report we update MERIT to analyze MPEG-2 les as well. We modify the le parsing process to account for the MPEG-2 speciications. We account for the new motion compensation modes introduced by MPEG-2 in preliminary computations, generating data structures that allow the original MERIT segmentation algorithm to work properly. A series of tests connrmed the validity of our solutions. The new version 4.0 of MERIT is a superset of MERIT 3.3, insofar as it gives the same results for MPEG-1 les, and is able to analyze MPEG-2 les using almost all the available options. Further improvements could be made to address key-frame storage and higher chrominance formats. 1 Overview MERIT (MPEG Encoded Retrieval and Indexing Toolkit 2, 11]) is a package that performs various MPEG-based analyses, such as video segmentation 5, 10], motion analysis, extraction of estimated DC coeecients or of ow vector information. It was written in C by V. Kobla for his doctoral work at the University of Maryland. Video segmentation consists of identifying breaks or cuts in an MPEG-encoded video clip, thus dividing the video into shots. A shot can be …