Tour a 5-section music montage and find each section start

OrientMusicTool missed

0:40CC0 · B.G. DeSylva Productions Inc

Proof frames

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Tool calls

2 calls · agentic-video 0.3.1

overview_chunksimac · 448 ms

Arguments

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

Result

{
  "ok": true,
  "data": {
    "chunks": [
      {
        "file_path": "/private<cache>/fdbcf4ec7f1d68febef2/contact_sheets/sheet_8samples_4cols_f1fffd.jpg",
        "sample_count": 8,
        "rows": 2,
        "cols": 4,
        "start_sec": 2.4825,
        "end_sec": 37.2375,
        "timestamps": [
          2.4825,
          7.4475,
          12.4125,
          17.377499999999998,
          22.3425,
          27.307499999999997,
          32.2725,
          37.2375
        ],
        "frame_width": 768,
        "frame_height": 432,
        "index": 1,
        "range_start_sec": 0,
        "range_end_sec": 39.72,
        "tool_file": {
          "_tag": "ToolFile",
          "name": "sheet_8samples_4cols_f1fffd.jpg",
          "mimeType": "image/jpeg",
          "encoding": "base64",
          "data": "<502576 base64 chars dropped>",
          "byteLength": 376930
        }
      }
    ],
    "total": 1,
    "start_sec": 0,
    "end_sec": 39.72,
    "chunk_sec": 60
  }
}

detect_cutsimac · 384 ms

Arguments

{
  "source": "$CLIP"
}

Result

{
  "ok": true,
  "data": {
    "cuts": [
      {
        "timestamp_sec": 7.16,
        "score": 0.686258,
        "kind": "cut"
      },
      {
        "timestamp_sec": 15.12,
        "score": 0.766405,
        "kind": "cut"
      },
      {
        "timestamp_sec": 18.95,
        "score": 0.077132,
        "kind": "transition"
      },
      {
        "timestamp_sec": 21.9,
        "score": 0.090878,
        "kind": "transition"
      },
      {
        "timestamp_sec": 24.96,
        "score": 0.801828,
        "kind": "cut"
      },
      {
        "timestamp_sec": 32.88,
        "score": 0.472584,
        "kind": "cut"
      }
    ],
    "total": 6
  }
}

Question and answer

Question: Give me a quick tour of this video. Where do the sections start?
Answer: detect_cuts lists 6 changes, at 7.16, 15.12, 18.95, 21.9, 24.96, 32.88 seconds.

Tool returned: [7.16,15.12,18.95,21.9,24.96,32.88]
Truth: [7.12,15.04,24.84,32.72]

Check failedprecision 0.67 (min 1), recall 1.00 (min 1), tolerance 0.5s

How it was checked

Truth from: constructed
Fixed at: 2026-10-30 19:42

Planted by this recipe before any tool ran: ffmpeg joined 5 sections with hard cuts and no sound, in this order: andy-russell-drum-solo-1945, imanuel-piano, street-musicians-new-arbat, street-drummer-portland, brian-silas-piano-bhopal. The sections start at 67.72 s, 110.48 s, 16.84 s, 29.48 s, 28.52 s in their sources and are 7.12, 7.92, 9.8, 7.88, 7 s long (no scene change above 0.3 inside any section). The truth is the planted join times 7.12 s, 15.04 s, 24.84 s, 32.72 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 5 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: CC0
Author: B.G. DeSylva Productions Inc
Source: commons.wikimedia.org

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

Also uses (insert 1)

Licence: CC-BY-SA-4.0
Author: PoseidonSports
Source: commons.wikimedia.org

This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.

Also uses (insert 2)

Licence: CC-BY-4.0
Author: Predatorsamsung
Source: commons.wikimedia.org

This file is licensed under the Creative Commons Attribution 4.0 International license.

Also uses (insert 3)

Licence: PD
Author: Kingofthedead
Source: commons.wikimedia.org

I, the copyright holder of this work, release this work into the public domain.

Also uses (insert 4)

Licence: CC-BY-SA-4.0
Author: Suyash Dwivedi
Source: commons.wikimedia.org

This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.