A metadata editor processes the metadata track of a multimedia composition to synchronize the metadata track with a video track and identify any errors in the metadata track internally or relative to the video track. The metadata editor effectively divides the metadata track into segments, displays breaks on the video and metadata tracks to show the metadata segments relative to the video track, characterizes each segment as being either erroneous (e.g., warranting attention by the user) or consistent (e.g., not warranting attention by the user), and highlights erroneous metadata segments, e.g., by displaying erroneous metadata segments using a different color, pattern, or other visual indicator than consistent metadata segments. The metadata editor provides various mechanisms to allow the user to manipulate the metadata track in order to correct erroneous metadata segments.