Vidu Q4 Preview

# 1. Submit a generation and keep its id (a refusal prints {"error": {"message": ...}})
RESP=$(curl -s https://api.revana.si/v1/generations \
  -H "Authorization: Bearer $REVANA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "vidu-q4-preview",
    "input": {
      "prompt": "A slow dolly shot through a neon-lit night market in the rain, steam rising from food stalls",
      "image_url": "https://example.com/start-frame.jpg",
      "resolution": "720p",
      "duration": 3,
      "aspect_ratio": "16:9",
      "audio": true
    }
  }')
echo "$RESP"
ID=$(echo "$RESP" | jq -r .id)

# 2. Poll it until status is "succeeded" or "failed" (a failed one has error.message)
curl -s https://api.revana.si/v1/generations/$ID \
  -H "Authorization: Bearer $REVANA_API_KEY"

# 3. Download the file once it has succeeded
curl -L https://api.revana.si/v1/generations/$ID/content \
  -H "Authorization: Bearer $REVANA_API_KEY" \
  -o out.mp4