Create/manage m3u playlists of tracks ("clips"), with each clip assigned a title, start/stop times, group, etc.

Clips are "virtual" in that they are just metadata about a section of interest in longer media, and different clips can refer to different sections of the same media.

Use virtual clips to identify, organize, and play/repeat sections of instructional videos, scenes from movies, snatches of songs, etc.

(NB: playlists created can be used with any player that works with m3u files, not just VLC.)