Unclear label annotations

[William-HYWu]

Dear Authors,

Thank you for your excellent work and for releasing this dataset. I had a couple of questions regarding the JSON label files:

1. In BBP01.mp4.json, the annotations appear to start at frame 13301 rather than 0. Does this mean that frames 0–13300 have no labels? Also, is frame 13301 indexed under the original 25 fps?

2. I noticed some additional labels (e.g., out-of-body). Could you clarify how these labels are defined and intended to be used?

Thank you very much for your time and clarification.

Best regards,
William