Find the cross-dissolve where two shots are joined

Cuts and editsSyntheticVerified

0:07generated · generated

Proof frames

Click a frame to seek

Tool calls

2 calls · agentic-video 0.3.1

detect_cutsimac · 277 ms

Arguments

{
  "source": "$CLIP"
}

Result

{
  "ok": true,
  "data": {
    "cuts": [
      {
        "timestamp_sec": 3.15,
        "score": 0.15295,
        "kind": "transition"
      }
    ],
    "total": 1
  }
}

inspect_windowimac · 266 ms

Arguments

{
  "source": "$CLIP",
  "start_sec": 1.68,
  "end_sec": 4.64,
  "fps": 2
}

Result

{
  "ok": true,
  "data": {
    "source_path": "~/hill/gallery/repo/cards/dissolve-synthetic/clip.mp4",
    "start_sec": 1.68,
    "end_sec": 4.64,
    "fps": 2,
    "frames": [
      {
        "index": 1,
        "timestamp_sec": 1.68,
        "timecode": "00:00:01.680",
        "file_path": "<cache>/4243b17707c5dd916f23/dense_3a61649497147e939ded/frame_0001.jpg",
        "width": 640,
        "height": 360,
        "requested_timestamp": 1.68,
        "decoded_timestamp": null,
        "timestamp_delta": null
      },
      {
        "index": 2,
        "timestamp_sec": 2.18,
        "timecode": "00:00:02.180",
        "file_path": "<cache>/4243b17707c5dd916f23/dense_3a61649497147e939ded/frame_0002.jpg",
        "width": 640,
        "height": 360,
        "requested_timestamp": 2.18,
        "decoded_timestamp": null,
        "timestamp_delta": null
      },
      {
        "index": 3,
        "timestamp_sec": 2.68,
        "timecode": "00:00:02.680",
        "file_path": "<cache>/4243b17707c5dd916f23/dense_3a61649497147e939ded/frame_0003.jpg",
        "width": 640,
        "height": 360,
        "requested_timestamp": 2.68,
        "decoded_timestamp": null,
        "timestamp_delta": null
      },
      {
        "index": 4,
        "timestamp_sec": 3.18,
        "timecode": "00:00:03.180",
        "file_path": "<cache>/4243b17707c5dd916f23/dense_3a61649497147e939ded/frame_0004.jpg",
        "width": 640,
        "height": 360,
        "requested_timestamp": 3.18,
        "decoded_timestamp": null,
        "timestamp_delta": null
      },
      {
        "index": 5,
        "timestamp_sec": 3.68,
        "timecode": "00:00:03.680",
        "file_path": "<cache>/4243b17707c5dd916f23/dense_3a61649497147e939ded/frame_0005.jpg",
        "width": 640,
        "height": 360,
        "requested_timestamp": 3.68,
        "decoded_timestamp": null,
        "timestamp_delta": null
      },
      {
        "index": 6,
        "timestamp_sec": 4.18,
        "timecode": "00:00:04.180",
        "file_path": "<cache>/4243b17707c5dd916f23/dense_3a61649497147e939ded/frame_0006.jpg",
        "width": 640,
        "height": 360,
        "requested_timestamp": 4.18,
        "decoded_timestamp": null,
        "timestamp_delta": null
      }
    ],
    "contact_sheet_path": "/private<cache>/4243b17707c5dd916f23/contact_sheets/sheet_6samples_4cols_ca80d5.jpg",
    "estimated_vision_tokens": 1548,
    "tool_file": {
      "_tag": "ToolFile",
      "name": "sheet_6samples_4cols_ca80d5.jpg",
      "mimeType": "image/jpeg",
      "encoding": "base64",
      "data": "<180672 base64 chars dropped>",
      "byteLength": 135503
    }
  }
}

Question and answer

Question: Is there a fade between shots? Where is it?
Answer: The tool reports a transition at 3.15 seconds, where the two shots meet.

Check passedanswer 3.15, expected 3.16 ±1.0

How it was checked

Truth from: constructed
Fixed at: 2026-10-30 19:41

Planted by this recipe before any tool ran: shot A is 4.16 s of synthetic-bouncing-ball from 0.4 s; shot B is 4.72 s of testcard from 7.44 s (another source of the same domain; neither shot has a hard cut inside). ffmpeg joined them with one 2.0 s cross-dissolve (xfade fade) from 2.16 s to 4.16 s of the clip. The truth is the fade midpoint 3.16 s, with tolerance 1 s (half the fade), so a cut time anywhere inside the fade passes. The window given to inspect_window is the fade plus 0.5 s either side, fixed here.

A script joined two shots, one from 'Generated bouncing ball with a bounce counter and click sound' and one from another clip of the same kind, with a planted 2.0 s cross-dissolve and no sound, so the answer is one time inside that fade (not its start and end); the card does not show whether detect_cuts finds other cuts.

Try it yourself

Use agentic-video on my video. Run detect_cuts on the whole video, then run inspect_window over the part where the picture fades into the next shot. Tell me the time of the fade.

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

Clip and licence

Licence: generated

Generated for the gallery; no third-party material.

Also uses (insert 1)

Licence: generated

Generated for the gallery; no third-party material.