{ "events": [ { "event_id": 1, "activity": "Group_Discussion", "start_second": 0, "end_second": 14, "start_timestamp": "00:00", "end_timestamp": "00:14", "duration_seconds": 15, "students_at_start": 5, "minimum_students": 5, "maximum_students": 7, "participation_pattern": "increased", "student_ids": [ "Student_1", "Student_2", "Student_3", "Student_4", "Student_5", "Student_6", "Student_7" ], "confidence": "high", "evidence": "A group of students is gathered around a table; one student is standing and speaking to the group while the others listen and react. Two more students join the table.", "event_limitations": "" }, { "event_id": 2, "activity": "Standing", "start_second": 0, "end_second": 14, "start_timestamp": "00:00", "end_timestamp": "00:14", "duration_seconds": 15, "students_at_start": 2, "minimum_students": 1, "maximum_students": 3, "participation_pattern": "varied", "student_ids": [ "Student_1", "Student_6", "Student_7", "Student_8" ], "confidence": "high", "evidence": "One student stands continuously while addressing the group. Other students stand briefly while passing by or arriving at their seats.", "event_limitations": "" }, { "event_id": 3, "activity": "Using_Phone", "start_second": 0, "end_second": 11, "start_timestamp": "00:00", "end_timestamp": "00:11", "duration_seconds": 12, "students_at_start": 1, "minimum_students": 1, "maximum_students": 1, "participation_pattern": "stable", "student_ids": [ "Student_4" ], "confidence": "high", "evidence": "A student seated at the table is looking down and visibly interacting with a smartphone.", "event_limitations": "" }, { "event_id": 4, "activity": "Away_From_Desk", "start_second": 0, "end_second": 2, "start_timestamp": "00:00", "end_timestamp": "00:02", "duration_seconds": 3, "students_at_start": 1, "minimum_students": 1, "maximum_students": 1, "participation_pattern": "stable", "student_ids": [ "Student_8" ], "confidence": "high", "evidence": "A student walks past the group discussion in the background.", "event_limitations": "" }, { "event_id": 5, "activity": "Smiling", "start_second": 0, "end_second": 5, "start_timestamp": "00:00", "end_timestamp": "00:05", "duration_seconds": 6, "students_at_start": 3, "minimum_students": 1, "maximum_students": 3, "participation_pattern": "varied", "student_ids": [ "Student_1", "Student_2", "Student_3", "Student_5" ], "confidence": "high", "evidence": "Multiple students in the group smile and laugh during the first part of the discussion.", "event_limitations": "" }, { "event_id": 6, "activity": "Handling_Materials", "start_second": 2, "end_second": 4, "start_timestamp": "00:02", "end_timestamp": "00:04", "duration_seconds": 3, "students_at_start": 1, "minimum_students": 1, "maximum_students": 1, "participation_pattern": "stable", "student_ids": [ "Student_3" ], "confidence": "high", "evidence": "A seated student handles a pen and paper on the desk.", "event_limitations": "" }, { "event_id": 7, "activity": "Away_From_Desk", "start_second": 6, "end_second": 14, "start_timestamp": "00:06", "end_timestamp": "00:14", "duration_seconds": 9, "students_at_start": 1, "minimum_students": 1, "maximum_students": 2, "participation_pattern": "varied", "student_ids": [ "Student_6", "Student_7" ], "confidence": "high", "evidence": "Two students sequentially walk into the frame and move towards their seats at the table.", "event_limitations": "" }, { "event_id": 8, "activity": "Handling_Materials", "start_second": 9, "end_second": 11, "start_timestamp": "00:09", "end_timestamp": "00:11", "duration_seconds": 3, "students_at_start": 1, "minimum_students": 1, "maximum_students": 1, "participation_pattern": "stable", "student_ids": [ "Student_6" ], "confidence": "high", "evidence": "An arriving student pulls a chair out from the table in order to sit down.", "event_limitations": "" }, { "event_id": 9, "activity": "Smiling", "start_second": 10, "end_second": 14, "start_timestamp": "00:10", "end_timestamp": "00:14", "duration_seconds": 5, "students_at_start": 1, "minimum_students": 1, "maximum_students": 6, "participation_pattern": "increased", "student_ids": [ "Student_1", "Student_2", "Student_3", "Student_5", "Student_6", "Student_7" ], "confidence": "high", "evidence": "Most of the group breaks into a collective smile and laugh simultaneously.", "event_limitations": "" }, { "event_id": 10, "activity": "Other", "start_second": 11, "end_second": 13, "start_timestamp": "00:11", "end_timestamp": "00:13", "duration_seconds": 3, "students_at_start": 5, "minimum_students": 5, "maximum_students": 5, "participation_pattern": "stable", "student_ids": [ "Student_1", "Student_2", "Student_3", "Student_4", "Student_5" ], "confidence": "high", "evidence": "Multiple students clap their hands together.", "event_limitations": "" }, { "event_id": 11, "activity": "Handling_Materials", "start_second": 12, "end_second": 14, "start_timestamp": "00:12", "end_timestamp": "00:14", "duration_seconds": 3, "students_at_start": 1, "minimum_students": 1, "maximum_students": 1, "participation_pattern": "stable", "student_ids": [ "Student_7" ], "confidence": "high", "evidence": "A second arriving student pulls a chair out from the table to take a seat.", "event_limitations": "" } ], "activity_summaries": [ { "activity": "Listening_to_Lecture", "event_count": 0, "total_duration_seconds": 0, "average_event_duration_seconds": 0, "minimum_event_duration_seconds": 0, "maximum_event_duration_seconds": 0, "largest_student_count": 0, "total_student_event_participations": 0 }, { "activity": "Note_Taking", "event_count": 0, "total_duration_seconds": 0, "average_event_duration_seconds": 0, "minimum_event_duration_seconds": 0, "maximum_event_duration_seconds": 0, "largest_student_count": 0, "total_student_event_participations": 0 }, { "activity": "One_to_One_Discussion", "event_count": 0, "total_duration_seconds": 0, "average_event_duration_seconds": 0, "minimum_event_duration_seconds": 0, "maximum_event_duration_seconds": 0, "largest_student_count": 0, "total_student_event_participations": 0 }, { "activity": "Group_Discussion", "event_count": 1, "total_duration_seconds": 15, "average_event_duration_seconds": 15.0, "minimum_event_duration_seconds": 15, "maximum_event_duration_seconds": 15, "largest_student_count": 7, "total_student_event_participations": 7 }, { "activity": "Using_Phone", "event_count": 1, "total_duration_seconds": 12, "average_event_duration_seconds": 12.0, "minimum_event_duration_seconds": 12, "maximum_event_duration_seconds": 12, "largest_student_count": 1, "total_student_event_participations": 1 }, { "activity": "Looking_Away", "event_count": 0, "total_duration_seconds": 0, "average_event_duration_seconds": 0, "minimum_event_duration_seconds": 0, "maximum_event_duration_seconds": 0, "largest_student_count": 0, "total_student_event_participations": 0 }, { "activity": "Handling_Materials", "event_count": 3, "total_duration_seconds": 9, "average_event_duration_seconds": 3.0, "minimum_event_duration_seconds": 3, "maximum_event_duration_seconds": 3, "largest_student_count": 1, "total_student_event_participations": 3 }, { "activity": "Hand_Raised", "event_count": 0, "total_duration_seconds": 0, "average_event_duration_seconds": 0, "minimum_event_duration_seconds": 0, "maximum_event_duration_seconds": 0, "largest_student_count": 0, "total_student_event_participations": 0 }, { "activity": "Answering_Question", "event_count": 0, "total_duration_seconds": 0, "average_event_duration_seconds": 0, "minimum_event_duration_seconds": 0, "maximum_event_duration_seconds": 0, "largest_student_count": 0, "total_student_event_participations": 0 }, { "activity": "Standing", "event_count": 1, "total_duration_seconds": 15, "average_event_duration_seconds": 15.0, "minimum_event_duration_seconds": 15, "maximum_event_duration_seconds": 15, "largest_student_count": 3, "total_student_event_participations": 3 }, { "activity": "Away_From_Desk", "event_count": 2, "total_duration_seconds": 12, "average_event_duration_seconds": 6.0, "minimum_event_duration_seconds": 3, "maximum_event_duration_seconds": 9, "largest_student_count": 2, "total_student_event_participations": 3 }, { "activity": "Smiling", "event_count": 2, "total_duration_seconds": 11, "average_event_duration_seconds": 5.5, "minimum_event_duration_seconds": 5, "maximum_event_duration_seconds": 6, "largest_student_count": 6, "total_student_event_participations": 9 }, { "activity": "Other", "event_count": 1, "total_duration_seconds": 3, "average_event_duration_seconds": 3.0, "minimum_event_duration_seconds": 3, "maximum_event_duration_seconds": 3, "largest_student_count": 5, "total_student_event_participations": 5 }, { "activity": "Unknown", "event_count": 0, "total_duration_seconds": 0, "average_event_duration_seconds": 0, "minimum_event_duration_seconds": 0, "maximum_event_duration_seconds": 0, "largest_student_count": 0, "total_student_event_participations": 0 } ], "student_summaries": [ { "id": "Student_1", "activities": [ { "activity": "Group_Discussion", "event_count": 1, "total_event_duration_seconds": 15 }, { "activity": "Standing", "event_count": 1, "total_event_duration_seconds": 15 }, { "activity": "Smiling", "event_count": 2, "total_event_duration_seconds": 11 }, { "activity": "Other", "event_count": 1, "total_event_duration_seconds": 3 } ] }, { "id": "Student_2", "activities": [ { "activity": "Group_Discussion", "event_count": 1, "total_event_duration_seconds": 15 }, { "activity": "Smiling", "event_count": 2, "total_event_duration_seconds": 11 }, { "activity": "Other", "event_count": 1, "total_event_duration_seconds": 3 } ] }, { "id": "Student_3", "activities": [ { "activity": "Group_Discussion", "event_count": 1, "total_event_duration_seconds": 15 }, { "activity": "Handling_Materials", "event_count": 1, "total_event_duration_seconds": 3 }, { "activity": "Smiling", "event_count": 2, "total_event_duration_seconds": 11 }, { "activity": "Other", "event_count": 1, "total_event_duration_seconds": 3 } ] }, { "id": "Student_4", "activities": [ { "activity": "Group_Discussion", "event_count": 1, "total_event_duration_seconds": 15 }, { "activity": "Using_Phone", "event_count": 1, "total_event_duration_seconds": 12 }, { "activity": "Other", "event_count": 1, "total_event_duration_seconds": 3 } ] }, { "id": "Student_5", "activities": [ { "activity": "Group_Discussion", "event_count": 1, "total_event_duration_seconds": 15 }, { "activity": "Smiling", "event_count": 2, "total_event_duration_seconds": 11 }, { "activity": "Other", "event_count": 1, "total_event_duration_seconds": 3 } ] }, { "id": "Student_6", "activities": [ { "activity": "Group_Discussion", "event_count": 1, "total_event_duration_seconds": 15 }, { "activity": "Standing", "event_count": 1, "total_event_duration_seconds": 15 }, { "activity": "Away_From_Desk", "event_count": 1, "total_event_duration_seconds": 9 }, { "activity": "Handling_Materials", "event_count": 1, "total_event_duration_seconds": 3 }, { "activity": "Smiling", "event_count": 1, "total_event_duration_seconds": 5 } ] }, { "id": "Student_7", "activities": [ { "activity": "Group_Discussion", "event_count": 1, "total_event_duration_seconds": 15 }, { "activity": "Standing", "event_count": 1, "total_event_duration_seconds": 15 }, { "activity": "Away_From_Desk", "event_count": 1, "total_event_duration_seconds": 9 }, { "activity": "Handling_Materials", "event_count": 1, "total_event_duration_seconds": 3 }, { "activity": "Smiling", "event_count": 1, "total_event_duration_seconds": 5 } ] }, { "id": "Student_8", "activities": [ { "activity": "Standing", "event_count": 1, "total_event_duration_seconds": 15 }, { "activity": "Away_From_Desk", "event_count": 1, "total_event_duration_seconds": 3 } ] } ], "metadata": { "video_duration_seconds": 15, "average_students_visible": 6.2, "maximum_students_visible": 7, "reliable_tracking": true, "tracking_notes": "Students are largely stationary around a central table or arrive clearly into the frame, allowing consistent identification throughout.", "event_gap_rule_seconds": 1, "limitations": [] } }