Not one image - 5 frames per clip, sent in a single request with a transcript snippet. So the multi-frame + subtitles in one call part is the same as yours.

But yeah, how it picks the frame is the weak-point here. Scene detection would definitely help - this is #1 on the Roadmap.

Could you share how your scene-detection picks the frames?

---

For the vector search, I went for the trade-off of not having it but keeping it simple with plain Markdown files for more portability. The knowledge travels with the files when an SSD moves, no index to keep in sync, and plain text that outlives the tool. But the other path you mentioned is interesting as well to explore.