ATLAS.ti! is a “Knowledge Workbench” for the qualitative analysis of texts, images, audio and video. It looks like a PC program that lets you annotate large quantities of materials for interpretation, coding, and clustering.
I saw this years ago, but it has matured and now handles multimedia. I should add that it is for sale, not free, though they have a trial version.
From their web site:
ATLAS.ti is a powerful workbench for the qualitative analysis of large bodies of textual, graphical, audio and video data. It offers a variety of tools for accomplishing the tasks associated with any systematic approach to “soft” data–i.e., material which cannot be analyzed by formal, statistical approaches in meaningful ways.