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Gemini Video Understanding

POST /v1beta/models/{model}:generateContent
As of 2026-04-08, successful Crazyrouter and local :4000 retests show:
  • gemini-2.5-pro can read video/mp4
  • the currently verified primary path is fileData.fileUri
  • the video URL must be publicly reachable by the Gemini upstream

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Verified Minimal Request

curl "https://crazyrouter.com/v1beta/models/gemini-2.5-pro:generateContent?key=YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {
            "fileData": {
              "mimeType": "video/mp4",
              "fileUri": "https://example.com/demo.mp4"
            }
          },
          {
            "text": "Describe the main subject, motion, and whether the camera is static."
          }
        ]
      }
    ],
    "generationConfig": {
      "maxOutputTokens": 512
    }
  }'
Observed successful response shape: 
{
  "candidates": [
    {
      "content": {
        "parts": [
          {
            "text": "The main subject is a red ball rolling from left to right, and the camera is static."
          }
        ]
      }
    }
  ]
}

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Request Notes

  • The primary recommended path for video understanding is fileData.fileUri
  • Set mimeType to the real file type, such as video/mp4
  • fileUri must be reachable by the Gemini upstream
  • Private-network URLs, signed flows that cannot be crawled, or inaccessible storage links are likely to fail
Do not assume the image-understanding request shape is the same as the video-understanding request shape. Images currently work best through inlineData, while the verified video path here uses fileData.fileUri.