2452022f15
Co-authored-by: Aryan Kumar <aryan5v@users.noreply.github.com> Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> Co-authored-by: CodeRabbit <noreply@coderabbit.ai> Co-authored-by: SolitaryThinker <wlsaidhi@gmail.com> Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
109 lines
3.7 KiB
Python
109 lines
3.7 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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"""Generate synchronized video and audio from an image and text with LTX-2.5."""
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from __future__ import annotations
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import argparse
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from pathlib import Path
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from fastvideo import VideoGenerator
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from fastvideo.api import (
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CompileConfig,
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EngineConfig,
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GenerationRequest,
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GeneratorConfig,
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OffloadConfig,
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OutputConfig,
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ParallelismConfig,
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PipelineSelection,
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SamplingConfig,
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)
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MODEL_IDS = {
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"distilled": "FastVideo/LTX-2.5-Distilled-Diffusers",
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"dev": "FastVideo/LTX-2.5-Dev-Diffusers",
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}
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def parse_args() -> argparse.Namespace:
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument("--variant", choices=tuple(MODEL_IDS), default="distilled")
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parser.add_argument(
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"--model-path",
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help="FastVideo-converted model directory or Hub ID; the raw split Lightricks repo is not directly loadable.",
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)
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parser.add_argument("--image", required=True)
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parser.add_argument("--prompt", required=True)
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parser.add_argument("--output", default="outputs/ltx2_5_i2av.mp4")
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parser.add_argument("--height", type=int)
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parser.add_argument("--width", type=int)
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parser.add_argument("--num-frames", type=int, default=121)
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parser.add_argument("--steps", type=int)
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parser.add_argument("--seed", type=int, default=10)
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parser.add_argument("--num-gpus", type=int, default=4)
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parser.add_argument("--torch-compile", action="store_true", help="Compile the transformer denoising path")
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return parser.parse_args()
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def main() -> None:
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args = parse_args()
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image_path = Path(args.image)
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if not image_path.is_file():
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raise SystemExit(f"Conditioning image not found: {image_path}")
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is_distilled = args.variant == "distilled"
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model_path = args.model_path or MODEL_IDS[args.variant]
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height = args.height or (1024 if is_distilled else 512)
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width = args.width or (1536 if is_distilled else 768)
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steps = args.steps or (8 if is_distilled else 30)
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output_path = Path(args.output)
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output_path.parent.mkdir(parents=True, exist_ok=True)
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generator = VideoGenerator.from_config(
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GeneratorConfig(
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model_path=model_path,
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engine=EngineConfig(
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num_gpus=args.num_gpus,
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use_fsdp_inference=args.num_gpus > 1,
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parallelism=ParallelismConfig(tp_size=1, sp_size=args.num_gpus),
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offload=OffloadConfig(
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dit=False,
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dit_layerwise=False,
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text_encoder=True,
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vae=True,
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pin_cpu_memory=False,
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),
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compile=CompileConfig(enabled=args.torch_compile),
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),
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pipeline=PipelineSelection(workload_type="i2v"),
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))
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try:
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result = generator.generate(
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GenerationRequest(
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prompt=args.prompt,
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sampling=SamplingConfig(
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seed=args.seed,
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height=height,
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width=width,
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num_frames=args.num_frames,
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fps=24,
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num_inference_steps=steps,
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guidance_scale=1.0 if is_distilled else 3.0,
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),
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output=OutputConfig(
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output_path=str(output_path),
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save_video=True,
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return_frames=False,
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),
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extensions={
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"ltx2_images": [(str(image_path), 0, 1.0)],
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"ltx2_image_crf": 18.0,
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},
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))
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print(f"Synchronized video and audio written to: {result.video_path}")
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finally:
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generator.shutdown()
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if __name__ == "__main__":
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main()
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