Find the frame rate and size of a clip

OrientTutorialVerified

1:00CC-BY-3.0 · Living Colour Filmproduktion, Hamburg, for Wikimedia Deutschland

Proof frames

Click a frame to seek

Tool calls

2 calls · agentic-video 0.3.1

probe_videobox · 31 ms

Arguments

{
  "source": "$CLIP"
}

Result

{
  "ok": true,
  "data": {
    "source_path": "~/work/cards/probe-tutorial/clip.mp4",
    "duration_sec": 60,
    "width": 320,
    "height": 180,
    "fps": 24,
    "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
    "size_bytes": 2497348,
    "has_audio": true,
    "audio_codec": "aac",
    "video_codec": "h264",
    "fingerprint": "4d5f4ddb5f72a7a24eb1",
    "has_video": true
  }
}

contact_sheetbox · 98 ms

Arguments

{
  "source": "$CLIP",
  "samples": 4
}

Result

{
  "ok": true,
  "data": {
    "file_path": "<cache>/4d5f4ddb5f72a7a24eb1/contact_sheets/sheet_4samples_4cols_e05b35.jpg",
    "sample_count": 4,
    "rows": 1,
    "cols": 4,
    "start_sec": 7.5,
    "end_sec": 52.5,
    "timestamps": [
      7.5,
      22.5,
      37.5,
      52.5
    ],
    "frame_width": 768,
    "frame_height": 432,
    "tool_file": {
      "_tag": "ToolFile",
      "name": "sheet_4samples_4cols_e05b35.jpg",
      "mimeType": "image/jpeg",
      "encoding": "base64",
      "data": "<223984 base64 chars dropped>",
      "byteLength": 167987
    }
  }
}

Question and answer

Question: What is the frame rate of this video, and how big is it?
Answer: The file plays at 24 frames per second.

Check passedanswer 24.0, expected 24.0 ±0.05

How it was checked

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

Planted by this recipe: ffmpeg re-encoded the source at 24 frames per second and 320 px wide (the choice is seeded from the card id). The truth is that setting; the tolerance 0.05 allows for rounding in the probe.

The source was re-encoded by a script at 24 frames per second and 320 px wide, so the answer is the setting the script chose, not a real-world camera fact.

Try it yourself

Use agentic-video to probe my video. Tell me its frame rate, width and height, then make a contact sheet of it. 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: Living Colour Filmproduktion, Hamburg, for Wikimedia Deutschland
Source: commons.wikimedia.org

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