The video index information has a tree structure comprising frame information, sound information, segment information, and package information each as a structure element object. The segment information manages package information for managing a plurality of other segment information as a group, and...http://www.google.de/patents/US7277621?utm_source=gb-gplus-sharePatent US7277621 - Recording medium with video index information recorded therein video information management method which uses the video index information, recording medium with audio index information recorded therein, audio information management method which uses the audio index information, video retrieval method which uses video index information, audio retrieval method which uses the audio index information and a video retrieval system
