Find the edits in a 4-shot screen recording clip

Cuts and editsScreen recordingTool missed

0:13CC-BY-SA-4.0 · NairobiPapel

Proof frames

Click a frame to seek

Tool calls

2 calls · agentic-video 0.3.1

detect_cutsimac · 236 ms

Arguments

{
  "source": "$CLIP"
}

Result

{
  "ok": true,
  "data": {
    "cuts": [
      {
        "timestamp_sec": 5.85,
        "score": 0.809778,
        "kind": "transition"
      },
      {
        "timestamp_sec": 9.04,
        "score": 0.189173,
        "kind": "cut"
      }
    ],
    "total": 2
  }
}

frame_atimac · 183 ms

Arguments

{
  "source": "$CLIP",
  "time_sec": 3.65
}

Result

{
  "ok": true,
  "data": {
    "frame_time_sec": 3.64,
    "width": 640,
    "height": 360,
    "source_width": 640,
    "source_height": 360,
    "crop": null,
    "scale": 1,
    "file_path": "<cache>/cf56f5311d412dfc3928/frame_at/frame_at_dc30b88b22dbe3e7.png",
    "tool_file": {
      "_tag": "ToolFile",
      "name": "frame_at_dc30b88b22dbe3e7.png",
      "mimeType": "image/png",
      "encoding": "base64",
      "data": "<13544 base64 chars dropped>",
      "byteLength": 10158
    }
  }
}

Question and answer

Question: Where are the edits in this video? Which are hard cuts and which are fades?
Answer: detect_cuts lists 2 edits: 5.85 s is a fade, 9.04 s is a hard cut.

Tool returned: [5.85,9.04]
Truth: [3.64,5.9,9]

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

How it was checked

Truth from: constructed
Fixed at: 2026-10-30 19:36

Planted by this recipe before any tool ran: ffmpeg cut 4 single-shot pieces from the source (no shot change by ffmpeg scene score above 0.2 within 0.5 s of a piece's edges; piece starts in the source 4.48, 14.44, 55.4, 46.88 s, piece lengths 3.64, 2.76, 3.6, 3.8 s, starts at least 8 s apart) and joined them in order with hard cuts and one 1 s cross-fade (xfade) after piece 2. The truth is the planted edit times 3.64 s (hard cut), 5.9 s (fade), 9 s (hard cut): each hard cut at its join, and the fade's middle. The calls are detect_cuts with its default threshold, then frame_at a quarter frame after the first planted edit (a fixed rule).

A script joined 4 pieces of one public screen recording clip with hard cuts and one 1 s fade, so this tests detection on a known constructed edit, not on a professionally cut film, and the audio was removed.

Try it yourself

Using agentic-video, find the edits in my video (the file I attach or name). Use detect_cuts to list every cut time, then check the first edit with frame_at. Tell me which edits are hard cuts and which are fades, with the times.

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

Clip and licence

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

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