Where does a search result begin?
Raw transcripts come out as a stream of short caption lines. Indexing each line makes every result a fragment with no context; indexing whole lessons makes every result a two-hour video with no useful timestamp.
I chunk the transcript into roughly thirty-second passages that keep their start time. That is long enough to read as a thought and short enough that the timestamp is precise. The result is a readable quote that is also a jump target.
