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English works best. Sound (ambience, effects, music) is generated with the picture. Up to 2,500 characters. To make several videos in one run, use **Batch of videos** below instead." }, "imageUrl": { "title": "Start image URL (image to video)", "type": "string", "description": "Optional. A direct link to a JPG, PNG or WebP picture that becomes the **first frame** of the video (image to video): the prompt then describes how it moves. Leave empty for text to video. At least 64 px a side, up to 25 MB." }, "lastFrameUrl": { "title": "End image URL", "type": "string", "description": "Optional, with a start image only. A picture the video should end on, for a transition between two frames." }, "duration": { "title": "Duration", "enum": [ "5", "10" ], "type": "string", "description": "Length of each video. 24 frames per second, with sound. **The free plan makes 5-second videos.**", "default": "5" }, "aspectRatio": { "title": "Aspect ratio", "enum": [ "auto", "16:9", "9:16", "1:1" ], "type": "string", "description": "Shape and resolution of the video.", "default": "auto" }, "seed": { "title": "Seed", "minimum": 0, "maximum": 2147483647, "type": "integer", "description": "Optional. The same prompt, settings and seed give the same video again. Leave empty for a random seed; the seed used is in the output." }, "videos": { "title": "Batch of videos", "type": "array", "description": "Optional. Up to **10 videos per run**, each an object with `prompt` and optionally `imageUrl`, `lastFrameUrl`, `duration`, `aspectRatio` and `seed` (the settings above are the defaults). 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