Count how many times one short motion repeats

CountScreen recordingTool missed

0:08PD · Fl.schmitt

Proof frames

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Tool calls

2 calls · agentic-video 0.3.1

count_repetitionsimac · 3 ms

Arguments

{
  "source": "$CLIP",
  "start_sec": 0.5,
  "end_sec": 7.5,
  "fps": 10,
  "max_period_sec": 3.5
}

Result

{
  "ok": true,
  "data": {
    "status": "in_progress",
    "retry_after_seconds": 2,
    "verify": "Rough count. Before answering, count cycles by eye with inspect_window or contact_sheet over this window; if your count differs, trust your own."
  }
}

count_repetitionsimac · 1 ms

Arguments

{
  "source": "$CLIP",
  "start_sec": 0.5,
  "end_sec": 7.5,
  "fps": 10,
  "max_period_sec": 3.5
}

Result

{
  "ok": true,
  "data": {
    "status": "complete",
    "count": 2,
    "cycles": [
      {
        "index": 1,
        "start_sec": 1.267,
        "end_sec": 4.267,
        "peak_sec": 2.767,
        "frame_badge": "#1"
      },
      {
        "index": 2,
        "start_sec": 3.933,
        "end_sec": 6.933,
        "peak_sec": 5.433,
        "frame_badge": "#2"
      }
    ],
    "period_sec": 3,
    "median_period_sec": 3,
    "regularity": 0.706,
    "confidence": 0.3,
    "signal_quality": "periodic",
    "method_used": "periodic",
    "motion_count": 0,
    "embedding_count": null,
    "periodic_count": 2,
    "note": "counts are estimates; verify ambiguous cycles with inspect_window; the methods disagree: the periodicity check counted 2 cycles about 3 s apart and replaced the amplitude count of 0 (motion 0), so confidence is capped at 0.3. Either count may be right: count by eye before answering",
    "contact_sheet": {
      "file_path": "<cache>/70877ab914414cefd361/contact_sheets/repetitions_abe85933b29cf09c407a.jpg",
      "sample_count": 2,
      "rows": 1,
      "cols": 2,
      "start_sec": 2.767,
      "end_sec": 5.433,
      "timestamps": [
        2.767,
        5.433
      ],
      "frame_width": 128,
      "frame_height": 72,
      "tool_file": {
        "_tag": "ToolFile",
        "name": "repetitions_abe85933b29cf09c407a.jpg",
        "mimeType": "image/jpeg",
        "encoding": "base64",
        "data": "<12864 base64 chars dropped>",
        "byteLength": 9646
      }
    },
    "verify": "Rough count. Before answering, count cycles by eye with inspect_window or contact_sheet over this window; if your count differs, trust your own."
  }
}

Question and answer

Question: How many times does the same motion repeat on screen?
Answer: The tool counts 2 repetitions between 0.5 and 7.5 seconds.

Tool returned: 2
Truth: 4

Check failedanswer 2, expected 4 (tolerance 0)

How it was checked

Truth from: constructed
Fixed at: 2026-10-30 19:34

Planted by this recipe: ffmpeg cut 1.5 s of the source from 33 s and looped it 4 times back to back (the stretch 1 to 7 s), with 1 s of still first frame before and 1 s of still last frame after. The truth is 4, the number of copies. The window 0.5 to 7.5 s is the user input: the stretch plus 0.5 s of still picture each side, given as start_sec and end_sec.

A script repeated one 1.5-second piece of this clip 4 times back to back, with still frames at each end, so the answer is the planted count of 4 copies. The window was given by the card, not found by the tool.

Try it yourself

Use agentic-video to count how many times the motion repeats in my video between 0.5 and 7.5 seconds. Use count_repetitions on that window, then count the cycles by eye too and tell me the number. Use my own file.

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

Clip and licence

Licence: PD
Author: Fl.schmitt
Source: commons.wikimedia.org

This work has been released into the public domain by its author, Fl.schmitt.