{
  "slug": "change-speed",
  "name": "gizza-ai/change-speed",
  "version": "0.1.0",
  "title": "Change Video Speed Online — gizza.ai",
  "description": "Speed up or slow down a video right in your browser, keeping audio in sync — pick a speed factor (0.25x–4x). Re-encodes locally with ffmpeg, nothing is uploaded, free.",
  "tags": [
    "video speed",
    "slow motion",
    "fast forward",
    "speed up video",
    "slow down video",
    "ffmpeg"
  ],
  "category": "video",
  "urls": {
    "page": "https://gizza.ai/tools/change-speed/",
    "markdown": "https://gizza.ai/tools/change-speed/index.md",
    "descriptor": "https://gizza.ai/tools/change-speed/tool.json",
    "deep_link_example": "https://gizza.ai/tools/change-speed/?url=https://example.com/input&factor=2"
  },
  "cli": "gizza tool change-speed 'url=https://example.com/input' 'factor=2'",
  "tool": {
    "description": "Speed up or slow down a video by a factor, keeping the audio in sync (>1 faster, <1 slower; e.g. 2 = double speed, 0.5 = half). Range 0.25-4. Provide the video as either url (HTTP/HTTPS) or ref (id from a prior tool call). Note: runs on the standalone page and the CLI (chat ffmpeg is unavailable).",
    "parameters": {
      "additionalProperties": false,
      "oneOf": [
        {
          "required": [
            "url"
          ]
        },
        {
          "required": [
            "ref"
          ]
        }
      ],
      "properties": {
        "factor": {
          "description": "Speed multiplier: >1 speeds up, <1 slows down (e.g. 2 = twice as fast, 0.5 = half speed). Range 0.25-4.",
          "maximum": 4,
          "minimum": 0.25,
          "type": "number"
        },
        "ref": {
          "description": "Reference id from a prior tool call. Use either url or ref.",
          "type": "string"
        },
        "url": {
          "description": "Video URL (HTTP/HTTPS). Use either url or ref.",
          "type": "string"
        }
      },
      "required": [
        "factor"
      ],
      "type": "object"
    }
  }
}