Ltx 2.3 Quality

curl -X POST https://superpowers.tools/v1/run \
  -H 'Authorization: Bearer $SP_KEY' \
  -d '{"tool":"fal.ltx-2.3-quality-extend-video-lora","input":{"prompt":"","video_url":"","loras":["marketing digital"]},"idempotency_key":"example-request-1"}'

{
  "type": "object",
  "required": [
    "loras",
    "prompt",
    "video_url"
  ],
  "properties": {
    "sync_mode": {
      "type": "boolean",
      "description": "If True, the media is returned as a data URI inline in the response. Useful for short-lived requests and tests.",
      "default": false
    },
    "enable_safety_checker": {
      "type": "boolean",
      "description": "Whether to enable the safety checker.",
      "default": true
    },
    "num_frames": {
      "type": "integer",
      "description": "The number of frames to generate for the extension segment, including num_context_frames of overlap with the source video. The new content adds approximately (num_frames - num_context_frames) / frames_per_second seconds. The stable generation budget caps the resolution x frames volume: at 24 fps rou",
      "default": 121
    },
    "match_input_fps": {
      "type": "boolean",
      "description": "When enabled, the output FPS matches the source video's FPS (rounded to an integer and clamped to the supported range) instead of frames_per_second.",
      "default": true
    },
    "num_inference_steps": {
      "type": "integer",
      "description": "Number of inference steps. Defaults to 15 and can be increased up to 30.",
      "default": 15
    },
    "end_image_strength": {
      "type": "number",
      "description": "Conditioning strength of the optional end keyframe. 1.0 = exact match, lower = more freedom for the model.",
      "default": 1
    },
    "negative_prompt": {
      "type": "string",
      "description": "The negative prompt to steer generation away from.",
      "default": "color distortion, overexposure, static, blurry details, subtitles, style, artwork, painting, frame, still, dim overall tone, worst quality, low quality, JPEG compression artifacts, ugly, mutilated, extra fingers, poorly drawn hands, poorly drawn face, deformed, disfigured, malformed limbs, fused fingers, motionless frame, cluttered background, three legs, crowded background, walking backwards"
    },
    "resolution": {
      "type": "string",
      "description": "The size of the generated video. 'auto' follows the source video size/aspect up to the LTX limits; the source is scaled to the final size in the stitched output. Sizes are 32px-aligned (e.g. 1920x1080 is delivered as 1888x1056). Higher resolutions reduce the maximum stable extension length; lower re",
      "default": "auto",
      "enum": [
        "auto",
        "square_hd",
        "square",
        "portrait_4_3",
        "portrait_16_9",
        "landscape_4_3",
        "landscape_16_9"
      ]
    },
    "enable_prompt_expansion": {
      "type": "boolean",
      "description": "Whether to enable prompt expansion.",
      "default": true
    },
    "seed": {
      "type": "integer",
      "description": "Random seed for reproducibility. If None, a random seed is chosen."
    },
    "guidance_scale": {
      "type": "number",
      "description": "Classifier-free guidance scale. The default is tuned for fast, high-quality generation.",
      "default": 1
    },
    "num_context_frames": {
      "type": "integer",
      "description": "The number of source frames used as context/overlap for the extension. Snapped down to the LTX temporal grid (8k+1) and clamped to the frames available in the source video.",
      "default": 25
    },
    "prompt": {
      "type": "string",
      "description": "The prompt describing how the video should continue."
    },
    "generate_audio": {
      "type": "boolean",
      "description": "Whether to generate new audio for the extension segment (crossfaded with the source audio at the seam). When disabled, the source video's own audio track is preserved and the extension stays silent.",
      "default": true
    },
    "end_image_url": {
      "type": "string",
      "description": "Optional keyframe image for the far end of the extension: the final frame for forward extension, or the new first frame for backward extension."
    },
    "video_write_mode": {
      "type": "string",
      "description": "The write mode of the generated video.",
      "default": "balanced",
      "enum": [
        "fast",
        "balanced",
        "small"
      ]
    },
    "extend_direction": {
      "type": "string",
      "description": "Direction to extend the video. 'forward' continues from the end of the video, 'backward' generates a new beginning.",
      "default": "forward",
      "enum": [
        "forward",
        "backward"
      ]
    },
    "video_strength": {
      "type": "number",
      "description": "Conditioning strength of the source context frames. 1.0 keeps the overlap locked to the source for a seamless transition; lower values give the model more freedom.",
      "default": 1
    },
    "video_url": {
      "type": "string",
      "description": "The URL of the video to extend."
    },
    "loras": {
      "type": "array",
      "description": "Up to 3 LoRAs to apply on top of LTX-2.3. Each path is downloaded through the registry SSRF-safe downloader before it is loaded. Max size: 3 GB per LoRA."
    },
    "video_quality": {
      "type": "string",
      "description": "The quality preset of the generated video.",
      "default": "high",
      "enum": [
        "low",
        "medium",
        "high",
        "maximum"
      ]
    },
    "frames_per_second": {
      "type": "number",
      "description": "Frames per second of the generated video.",
      "default": 24
    }
  }
}