Automated PR - 2026-01-05
This commit is contained in:
sync-bot
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import logging
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from collections.abc import Iterator
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import torch
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from ltx_core.components.diffusion_steps import EulerDiffusionStep
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from ltx_core.components.guiders import CFGGuider
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from ltx_core.components.noisers import GaussianNoiser
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from ltx_core.components.protocols import DiffusionStepProtocol
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from ltx_core.components.schedulers import LTX2Scheduler
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from ltx_core.loader import LoraPathStrengthAndSDOps
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from ltx_core.model.audio_vae import decode_audio as vae_decode_audio
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from ltx_core.model.upsampler import upsample_video
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from ltx_core.model.video_vae import TilingConfig, get_video_chunks_number
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from ltx_core.model.video_vae import decode_video as vae_decode_video
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from ltx_core.text_encoders.gemma import encode_text
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from ltx_core.types import LatentState, VideoPixelShape
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from ltx_pipelines.utils import ModelLedger
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from ltx_pipelines.utils.args import default_2_stage_arg_parser
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from ltx_pipelines.utils.constants import (
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AUDIO_SAMPLE_RATE,
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STAGE_2_DISTILLED_SIGMA_VALUES,
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)
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from ltx_pipelines.utils.helpers import (
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assert_resolution,
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cleanup_memory,
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denoise_audio_video,
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euler_denoising_loop,
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generate_enhanced_prompt,
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get_device,
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guider_denoising_func,
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image_conditionings_by_adding_guiding_latent,
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simple_denoising_func,
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)
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from ltx_pipelines.utils.media_io import encode_video
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from ltx_pipelines.utils.types import PipelineComponents
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device = get_device()
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class KeyframeInterpolationPipeline:
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"""
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Keyframe-based Two-stage video interpolation pipeline.
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Interpolates between keyframes to generate a video with smoother transitions.
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Stage 1 generates video at the target resolution, then Stage 2 upsamples
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by 2x and refines with additional denoising steps for higher quality output.
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"""
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def __init__(
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self,
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checkpoint_path: str,
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distilled_lora: list[LoraPathStrengthAndSDOps],
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spatial_upsampler_path: str,
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gemma_root: str,
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loras: list[LoraPathStrengthAndSDOps],
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device: torch.device = device,
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fp8transformer: bool = False,
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):
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self.device = device
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self.dtype = torch.bfloat16
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self.stage_1_model_ledger = ModelLedger(
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dtype=self.dtype,
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device=device,
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checkpoint_path=checkpoint_path,
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spatial_upsampler_path=spatial_upsampler_path,
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gemma_root_path=gemma_root,
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loras=loras,
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fp8transformer=fp8transformer,
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)
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self.stage_2_model_ledger = self.stage_1_model_ledger.with_loras(
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loras=distilled_lora,
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)
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self.pipeline_components = PipelineComponents(
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dtype=self.dtype,
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device=device,
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)
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@torch.inference_mode()
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def __call__( # noqa: PLR0913
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self,
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prompt: str,
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negative_prompt: str,
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seed: int,
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height: int,
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width: int,
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num_frames: int,
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frame_rate: float,
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num_inference_steps: int,
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cfg_guidance_scale: float,
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images: list[tuple[str, int, float]],
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tiling_config: TilingConfig | None = None,
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enhance_prompt: bool = False,
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) -> tuple[Iterator[torch.Tensor], torch.Tensor]:
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assert_resolution(height=height, width=width, is_two_stage=True)
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generator = torch.Generator(device=self.device).manual_seed(seed)
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noiser = GaussianNoiser(generator=generator)
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stepper = EulerDiffusionStep()
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cfg_guider = CFGGuider(cfg_guidance_scale)
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dtype = torch.bfloat16
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text_encoder = self.stage_1_model_ledger.text_encoder()
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if enhance_prompt:
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prompt = generate_enhanced_prompt(
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text_encoder, prompt, images[0][0] if len(images) > 0 else None, seed=seed
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)
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context_p, context_n = encode_text(text_encoder, prompts=[prompt, negative_prompt])
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v_context_p, a_context_p = context_p
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v_context_n, a_context_n = context_n
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torch.cuda.synchronize()
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del text_encoder
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cleanup_memory()
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# Stage 1: Initial low resolution video generation.
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video_encoder = self.stage_1_model_ledger.video_encoder()
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transformer = self.stage_1_model_ledger.transformer()
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sigmas = LTX2Scheduler().execute(steps=num_inference_steps).to(dtype=torch.float32, device=self.device)
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def first_stage_denoising_loop(
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sigmas: torch.Tensor, video_state: LatentState, audio_state: LatentState, stepper: DiffusionStepProtocol
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) -> tuple[LatentState, LatentState]:
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return euler_denoising_loop(
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sigmas=sigmas,
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video_state=video_state,
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audio_state=audio_state,
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stepper=stepper,
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denoise_fn=guider_denoising_func(
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cfg_guider,
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v_context_p,
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v_context_n,
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a_context_p,
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a_context_n,
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transformer=transformer, # noqa: F821
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),
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)
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stage_1_output_shape = VideoPixelShape(
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batch=1,
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frames=num_frames,
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width=width // 2,
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height=height // 2,
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fps=frame_rate,
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)
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stage_1_conditionings = image_conditionings_by_adding_guiding_latent(
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images=images,
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height=stage_1_output_shape.height,
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width=stage_1_output_shape.width,
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video_encoder=video_encoder,
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dtype=dtype,
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device=self.device,
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)
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video_state, audio_state = denoise_audio_video(
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output_shape=stage_1_output_shape,
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conditionings=stage_1_conditionings,
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noiser=noiser,
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sigmas=sigmas,
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stepper=stepper,
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denoising_loop_fn=first_stage_denoising_loop,
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components=self.pipeline_components,
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dtype=dtype,
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device=self.device,
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)
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torch.cuda.synchronize()
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del transformer
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cleanup_memory()
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# Stage 2: Upsample and refine the video at higher resolution with distilled LORA.
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upscaled_video_latent = upsample_video(
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latent=video_state.latent[:1],
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video_encoder=video_encoder,
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upsampler=self.stage_2_model_ledger.spatial_upsampler(),
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)
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torch.cuda.synchronize()
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cleanup_memory()
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transformer = self.stage_2_model_ledger.transformer()
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distilled_sigmas = torch.Tensor(STAGE_2_DISTILLED_SIGMA_VALUES).to(self.device)
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def second_stage_denoising_loop(
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sigmas: torch.Tensor, video_state: LatentState, audio_state: LatentState, stepper: DiffusionStepProtocol
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) -> tuple[LatentState, LatentState]:
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return euler_denoising_loop(
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sigmas=sigmas,
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video_state=video_state,
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audio_state=audio_state,
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stepper=stepper,
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denoise_fn=simple_denoising_func(
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video_context=v_context_p,
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audio_context=a_context_p,
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transformer=transformer, # noqa: F821
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),
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)
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stage_2_output_shape = VideoPixelShape(batch=1, frames=num_frames, width=width, height=height, fps=frame_rate)
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stage_2_conditionings = image_conditionings_by_adding_guiding_latent(
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images=images,
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height=stage_2_output_shape.height,
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width=stage_2_output_shape.width,
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video_encoder=video_encoder,
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dtype=dtype,
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device=self.device,
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)
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video_state, audio_state = denoise_audio_video(
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output_shape=stage_2_output_shape,
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conditionings=stage_2_conditionings,
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noiser=noiser,
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sigmas=distilled_sigmas,
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stepper=stepper,
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denoising_loop_fn=second_stage_denoising_loop,
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components=self.pipeline_components,
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dtype=dtype,
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device=self.device,
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noise_scale=distilled_sigmas[0],
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initial_video_latent=upscaled_video_latent,
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initial_audio_latent=audio_state.latent,
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)
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torch.cuda.synchronize()
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del transformer
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del video_encoder
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cleanup_memory()
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decoded_video = vae_decode_video(video_state.latent, self.stage_2_model_ledger.video_decoder(), tiling_config)
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decoded_audio = vae_decode_audio(
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audio_state.latent, self.stage_2_model_ledger.audio_decoder(), self.stage_2_model_ledger.vocoder()
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)
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return decoded_video, decoded_audio
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@torch.inference_mode()
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def main() -> None:
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logging.getLogger().setLevel(logging.INFO)
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parser = default_2_stage_arg_parser()
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args = parser.parse_args()
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pipeline = KeyframeInterpolationPipeline(
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checkpoint_path=args.checkpoint_path,
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distilled_lora=args.distilled_lora,
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spatial_upsampler_path=args.spatial_upsampler_path,
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gemma_root=args.gemma_root,
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loras=args.lora,
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fp8transformer=args.enable_fp8,
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)
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tiling_config = TilingConfig.default()
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video_chunks_number = get_video_chunks_number(args.num_frames, tiling_config)
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video, audio = pipeline(
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prompt=args.prompt,
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negative_prompt=args.negative_prompt,
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seed=args.seed,
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height=args.height,
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width=args.width,
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num_frames=args.num_frames,
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frame_rate=args.frame_rate,
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num_inference_steps=args.num_inference_steps,
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cfg_guidance_scale=args.cfg_guidance_scale,
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images=args.images,
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tiling_config=tiling_config,
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)
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encode_video(
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video=video,
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fps=args.frame_rate,
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audio=audio,
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audio_sample_rate=AUDIO_SAMPLE_RATE,
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output_path=args.output_path,
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video_chunks_number=video_chunks_number,
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)
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if __name__ == "__main__":
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main()
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