from fastvideo import VideoGenerator

OUTPUT_PATH = "video_samples_wan2_2_14B_t2v"


def main():
    # FastVideo will automatically use the optimal default arguments for the
    # model.
    # If a local path is provided, FastVideo will make a best effort
    # attempt to identify the optimal arguments.
    generator = VideoGenerator.from_pretrained(
        "Wan-AI/Wan2.2-T2V-A14B-Diffusers",
        # FastVideo will automatically handle distributed setup
        num_gpus=2,
        use_fsdp_inference=False,  # set to True if GPU is out of memory 
        dit_cpu_offload=True,  # DiT need to be offloaded for MoE
        vae_cpu_offload=False,
        text_encoder_cpu_offload=True,
        # Set pin_cpu_memory to false if CPU RAM is limited and there're no frequent CPU-GPU transfer
        pin_cpu_memory=True,
        # image_encoder_cpu_offload=False,
    )

    # Generate videos with the same simple API, regardless of GPU count
    prompt = ("A curious raccoon peers through a vibrant field of yellow sunflowers, its eyes "
              "wide with interest. The playful yet serene atmosphere is complemented by soft "
              "natural light filtering through the petals. Mid-shot, warm and cheerful tones.")
    _ = generator.generate({
        "prompt": prompt,
        "sampling": {
            "height": 720,
            "width": 1280,
            "num_frames": 81,
        },
        "output": {
            "output_path": OUTPUT_PATH,
            "save_video": True,
        },
    })

    # Generate another video with a different prompt, without reloading the
    # model!
    prompt2 = ("A majestic lion strides across the golden savanna, its powerful frame "
               "glistening under the warm afternoon sun. The tall grass ripples gently in "
               "the breeze, enhancing the lion's commanding presence. The tone is vibrant, "
               "embodying the raw energy of the wild. Low angle, steady tracking shot, "
               "cinematic.")
    _ = generator.generate({
        "prompt": prompt2,
        "sampling": {
            "height": 720,
            "width": 1280,
            "num_frames": 81,
        },
        "output": {
            "output_path": OUTPUT_PATH,
            "save_video": True,
        },
    })


if __name__ == "__main__":
    main()