Transana is an Open
Source package to facilitate analyzing audio and video data. Here's
what they say about it:
Transana is software for professional researchers who want to analyze
digital video or audio data. Transana lets you analyze and manage your
data in very sophisticated ways. Transcribe it, identify analytically
interesting clips, assign keywords to clips, arrange and rearrange
clips, create complex collections of interrelated clips, explore
relationships between applied keywords, and share your analysis with
colleagues. The result is a new way to focus on your data, and a new
way to manage large collections of video and audio files and clips.
I haven't used it. The favored platform is Windows. It could be
worth a look, though. Thanks to Charlie Gee for pointing this out.