Tour a 3-section lecture montage and find each section start

OrientLectureVerified

0:28CC-BY-3.0 · Susan Dean, Barbara Illowsky

Proof frames

Click a frame to seek

Tool calls

2 calls · agentic-video 0.3.1

overview_chunksimac · 786 ms

Arguments

{
  "source": "$CLIP",
  "chunk_sec": 60,
  "samples_per_chunk": 8
}

Result

{
  "ok": true,
  "data": {
    "chunks": [
      {
        "file_path": "/private<cache>/aa44becc252fbd2d4a5a/contact_sheets/sheet_8samples_4cols_b6c898.jpg",
        "sample_count": 8,
        "rows": 2,
        "cols": 4,
        "start_sec": 1.73,
        "end_sec": 25.95,
        "timestamps": [
          1.73,
          5.1899999999999995,
          8.65,
          12.11,
          15.57,
          19.03,
          22.49,
          25.95
        ],
        "frame_width": 768,
        "frame_height": 432,
        "index": 1,
        "range_start_sec": 0,
        "range_end_sec": 27.68,
        "tool_file": {
          "_tag": "ToolFile",
          "name": "sheet_8samples_4cols_b6c898.jpg",
          "mimeType": "image/jpeg",
          "encoding": "base64",
          "data": "<351292 base64 chars dropped>",
          "byteLength": 263467
        }
      }
    ],
    "total": 1,
    "start_sec": 0,
    "end_sec": 27.68,
    "chunk_sec": 60
  }
}

detect_cutsimac · 479 ms

Arguments

{
  "source": "$CLIP"
}

Result

{
  "ok": true,
  "data": {
    "cuts": [
      {
        "timestamp_sec": 8.24,
        "score": 1,
        "kind": "cut"
      },
      {
        "timestamp_sec": 17.84,
        "score": 1,
        "kind": "cut"
      }
    ],
    "total": 2
  }
}

Question and answer

Question: Give me a quick tour of this video. Where do the sections start?
Answer: detect_cuts lists 2 changes, at 8.24, 17.84 seconds.

Check passedprecision 1.00 (min 1), recall 1.00 (min 1), tolerance 0.5s

How it was checked

Truth from: constructed
Fixed at: 2026-10-30 20:25

Planted by this recipe before any tool ran: ffmpeg joined 3 sections with hard cuts and no sound, in this order: elementary-stats-probability, copyrightx-2-1-introduction, kirillov-evolutionary-economics. The sections start at 46.4 s, 78.44 s, 38.12 s in their sources and are 8.24, 9.56, 9.88 s long (no scene change above 0.1 inside any section; sources skipped for having no such section: none). The truth is the planted join times 8.24 s, 17.8 s, the start of each section after the first, with tolerance 0.5 s. The calls are overview_chunks over the whole montage as one sheet, then detect_cuts with its default threshold, both fixed before the run.

A script joined 3 sections, each from a different clip of the same kind, with hard cuts and no sound, so the answer is the planted joins and not a real film's structure. The first section's start (0 s) is not counted.

Try it yourself

Using agentic-video, give me a quick tour of my video. Run overview_chunks on the whole video to see its sections, then run detect_cuts on the whole video and tell me the time of each section start, in seconds. Use my own file.

Get the .mcpb file and open it in Claude Desktop.
Or: pip install agentic-video

Clip and licence

Licence: CC-BY-3.0
Author: Susan Dean, Barbara Illowsky
Source: commons.wikimedia.org

This file is licensed under the Creative Commons Attribution 3.0 Unported license.

Also uses (insert 1)

Licence: CC-BY-3.0
Author: Berkman Center (presenter: William Fisher)
Source: commons.wikimedia.org

This file is licensed under the Creative Commons Attribution 3.0 Unported license.

Also uses (insert 2)

Licence: CC0
Author: Andrew Krizhanovsky (Alexander Kirillov, lecturer)
Source: commons.wikimedia.org

This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.