api/ltx_server.py

# ltx_server.py — VideoService (beta 1.1)
# Sempre output_type="latent"; no final: VAE (bloco inteiro) → pixels → MP4.
# Ignora UserWarning/FutureWarning e injeta VAE no manager com dtype/device corretos.

# --- 0. WARNINGS E AMBIENTE ---
import warnings
warnings.filterwarnings("ignore", category=UserWarning)
warnings.filterwarnings("ignore", category=FutureWarning)
warnings.filterwarnings("ignore", message=".*")

from huggingface_hub import logging

logging.set_verbosity_error()
logging.set_verbosity_warning()
logging.set_verbosity_info()
logging.set_verbosity_debug()


LTXV_DEBUG=1
LTXV_FRAME_LOG_EVERY=8



# --- 1. IMPORTAÇÕES ---
import os, subprocess, shlex, tempfile
import torch
import json
import numpy as np
import random
import os
import shlex
import yaml
from typing import List, Dict
from pathlib import Path
import imageio
import tempfile
from huggingface_hub import hf_hub_download
import sys
import subprocess
import gc
import shutil
import contextlib
import time
import traceback

# Singletons (versões simples)
from managers.vae_manager import vae_manager_singleton
from tools.video_encode_tool import video_encode_tool_singleton

# --- 2. GERENCIAMENTO DE DEPENDÊNCIAS E SETUP ---
def _query_gpu_processes_via_nvml(device_index: int) -> List[Dict]:
    try:
        import psutil
        import pynvml as nvml
        nvml.nvmlInit()
        handle = nvml.nvmlDeviceGetHandleByIndex(device_index)
        try:
            procs = nvml.nvmlDeviceGetComputeRunningProcesses_v3(handle)
        except Exception:
            procs = nvml.nvmlDeviceGetComputeRunningProcesses(handle)
        results = []
        for p in procs:
            pid = int(p.pid)
            used_mb = None
            try:
                if getattr(p, "usedGpuMemory", None) is not None and p.usedGpuMemory not in (0,):
                    used_mb = max(0, int(p.usedGpuMemory) // (1024 * 1024))
            except Exception:
                used_mb = None
            name = "unknown"
            user = "unknown"
            try:
                import psutil
                pr = psutil.Process(pid)
                name = pr.name()
                user = pr.username()
            except Exception:
                pass
            results.append({"pid": pid, "name": name, "user": user, "used_mb": used_mb})
        nvml.nvmlShutdown()
        return results
    except Exception:
        return []

def _query_gpu_processes_via_nvidiasmi(device_index: int) -> List[Dict]:
    cmd = f"nvidia-smi -i {device_index} --query-compute-apps=pid,process_name,used_memory --format=csv,noheader,nounits"
    try:
        out = subprocess.check_output(shlex.split(cmd), stderr=subprocess.STDOUT, text=True, timeout=2.0)
    except Exception:
        return []
    results = []
    for line in out.strip().splitlines():
        parts = [p.strip() for p in line.split(",")]
        if len(parts) >= 3:
            try:
                pid = int(parts[0]); name = parts[1]; used_mb = int(parts[2])
                user = "unknown"
                try:
                    import psutil
                    pr = psutil.Process(pid)
                    user = pr.username()
                except Exception:
                    pass
                results.append({"pid": pid, "name": name, "user": user, "used_mb": used_mb})
            except Exception:
                continue
    return results

def _gpu_process_table(processes: List[Dict], current_pid: int) -> str:
    if not processes:
        return "  - Processos ativos: (nenhum)\n"
    processes = sorted(processes, key=lambda x: (x.get("used_mb") or 0), reverse=True)
    lines = ["  - Processos ativos (PID | USER | NAME | VRAM MB):"]
    for p in processes:
        star = "*" if p["pid"] == current_pid else " "
        used_str = str(p["used_mb"]) if p.get("used_mb") is not None else "N/A"
        lines.append(f"    {star} {p['pid']} | {p['user']} | {p['name']} | {used_str}")
    return "\n".join(lines) + "\n"

def run_setup():
    setup_script_path = "setup.py"
    if not os.path.exists(setup_script_path):
        print("[DEBUG] 'setup.py' não encontrado. Pulando clonagem de dependências.")
        return
    try:
        print("[DEBUG] Executando setup.py para dependências...")
        subprocess.run([sys.executable, setup_script_path], check=True)
        print("[DEBUG] Setup concluído com sucesso.")
    except subprocess.CalledProcessError as e:
        print(f"[DEBUG] ERRO no setup.py (code {e.returncode}). Abortando.")
        sys.exit(1)

from api.ltx.inference import (
    create_ltx_video_pipeline,
    create_latent_upsampler,
    load_image_to_tensor_with_resize_and_crop,
    seed_everething,
    calculate_padding,
    load_media_file,
)

DEPS_DIR = Path("/data")
LTX_VIDEO_REPO_DIR = DEPS_DIR / "LTX-Video"
if not LTX_VIDEO_REPO_DIR.exists():
    print(f"[DEBUG] Repositório não encontrado em {LTX_VIDEO_REPO_DIR}. Rodando setup...")
    run_setup()

def add_deps_to_path():
    repo_path = str(LTX_VIDEO_REPO_DIR.resolve())
    if str(LTX_VIDEO_REPO_DIR.resolve()) not in sys.path:
        sys.path.insert(0, repo_path)
        print(f"[DEBUG] Repo adicionado ao sys.path: {repo_path}")

add_deps_to_path()

# --- 3. IMPORTAÇÕES ESPECÍFICAS DO MODELO ---

from ltx_video.pipelines.pipeline_ltx_video import ConditioningItem, LTXMultiScalePipeline
from ltx_video.utils.skip_layer_strategy import SkipLayerStrategy

# --- 4. FUNÇÕES HELPER DE LOG ---
def log_tensor_info(tensor, name="Tensor"):
    if not isinstance(tensor, torch.Tensor):
        print(f"\n[INFO] '{name}' não é tensor.")
        return
    print(f"\n--- Tensor: {name} ---")
    print(f"  - Shape: {tuple(tensor.shape)}")
    print(f"  - Dtype: {tensor.dtype}")
    print(f"  - Device: {tensor.device}")
    if tensor.numel() > 0:
        try:
            print(f"  - Min: {tensor.min().item():.4f}  Max: {tensor.max().item():.4f}  Mean: {tensor.mean().item():.4f}")
        except Exception:
            pass
    print("------------------------------------------\n")

# --- 5. CLASSE PRINCIPAL DO SERVIÇO ---
class VideoService:
    def __init__(self):
        t0 = time.perf_counter()
        print("[DEBUG] Inicializando VideoService...")
        self.debug = os.getenv("LTXV_DEBUG", "1") == "1"
        self.frame_log_every = int(os.getenv("LTXV_FRAME_LOG_EVERY", "8"))
        self.config = self._load_config()
        print(f"[DEBUG] Config carregada (precision={self.config.get('precision')}, sampler={self.config.get('sampler')})")
        self.device = "cuda" if torch.cuda.is_available() else "cpu"
        print(f"[DEBUG] Device selecionado: {self.device}")
        self.last_memory_reserved_mb = 0.0
        self._tmp_dirs = set(); self._tmp_files = set(); self._last_outputs = []

        self.pipeline, self.latent_upsampler = self._load_models()
        print(f"[DEBUG] Pipeline e Upsampler carregados. Upsampler ativo? {bool(self.latent_upsampler)}")

        print(f"[DEBUG] Movendo modelos para {self.device}...")
        self.pipeline.to(self.device)
        if self.latent_upsampler:
            self.latent_upsampler.to(self.device)

        self._apply_precision_policy()
        print(f"[DEBUG] runtime_autocast_dtype = {getattr(self, 'runtime_autocast_dtype', None)}")

        # Injeta pipeline/vae no manager (impede vae=None)
        vae_manager_singleton.attach_pipeline(
            self.pipeline,
            device=self.device,
            autocast_dtype=self.runtime_autocast_dtype
        )
        print(f"[DEBUG] VAE manager conectado: has_vae={hasattr(self.pipeline, 'vae')} device={self.device}")

        if self.device == "cuda":
            torch.cuda.empty_cache()
            self._log_gpu_memory("Após carregar modelos")

        print(f"[DEBUG] VideoService pronto. boot_time={time.perf_counter()-t0:.3f}s")

    def _log_gpu_memory(self, stage_name: str):
        if self.device != "cuda":
            return
        device_index = torch.cuda.current_device() if torch.cuda.is_available() else 0
        current_reserved_b = torch.cuda.memory_reserved(device_index)
        current_reserved_mb = current_reserved_b / (1024 ** 2)
        total_memory_b = torch.cuda.get_device_properties(device_index).total_memory
        total_memory_mb = total_memory_b / (1024 ** 2)
        peak_reserved_mb = torch.cuda.max_memory_reserved(device_index) / (1024 ** 2)
        delta_mb = current_reserved_mb - getattr(self, "last_memory_reserved_mb", 0.0)
        processes = _query_gpu_processes_via_nvml(device_index) or _query_gpu_processes_via_nvidiasmi(device_index)
        print(f"\n--- [LOG GPU] {stage_name} (cuda:{device_index}) ---")
        print(f"  - Reservado: {current_reserved_mb:.2f} MB / {total_memory_mb:.2f} MB  (Δ={delta_mb:+.2f} MB)")
        if peak_reserved_mb > getattr(self, "last_memory_reserved_mb", 0.0):
            print(f"  - Pico reservado (nesta fase): {peak_reserved_mb:.2f} MB")
        print(_gpu_process_table(processes, os.getpid()), end="")
        print("--------------------------------------------------\n")
        self.last_memory_reserved_mb = current_reserved_mb

    def _register_tmp_dir(self, d: str):
        if d and os.path.isdir(d):
            self._tmp_dirs.add(d); print(f"[DEBUG] Registrado tmp dir: {d}")

    def _register_tmp_file(self, f: str):
        if f and os.path.exists(f):
            self._tmp_files.add(f); print(f"[DEBUG] Registrado tmp file: {f}")

    def finalize(self, keep_paths=None, extra_paths=None, clear_gpu=True):
        print("[DEBUG] Finalize: iniciando limpeza...")
        keep = set(keep_paths or []); extras = set(extra_paths or [])
        removed_files = 0
        for f in list(self._tmp_files | extras):
            try:
                if f not in keep and os.path.isfile(f):
                    os.remove(f); removed_files += 1; print(f"[DEBUG] Removido arquivo tmp: {f}")
            except Exception as e:
                print(f"[DEBUG] Falha removendo arquivo {f}: {e}")
            finally:
                self._tmp_files.discard(f)
        removed_dirs = 0
        for d in list(self._tmp_dirs):
            try:
                if d not in keep and os.path.isdir(d):
                    shutil.rmtree(d, ignore_errors=True); removed_dirs += 1; print(f"[DEBUG] Removido diretório tmp: {d}")
            except Exception as e:
                print(f"[DEBUG] Falha removendo diretório {d}: {e}")
            finally:
                self._tmp_dirs.discard(d)
        print(f"[DEBUG] Finalize: arquivos removidos={removed_files}, dirs removidos={removed_dirs}")
        gc.collect()
        try:
            if clear_gpu and torch.cuda.is_available():
                torch.cuda.empty_cache()
                try:
                    torch.cuda.ipc_collect()
                except Exception:
                    pass
        except Exception as e:
            print(f"[DEBUG] Finalize: limpeza GPU falhou: {e}")
        try:
            self._log_gpu_memory("Após finalize")
        except Exception as e:
            print(f"[DEBUG] Log GPU pós-finalize falhou: {e}")

    def _load_config(self):
        base = LTX_VIDEO_REPO_DIR / "configs"
        candidates = [
            base / "ltxv-13b-0.9.8-dev-fp8.yaml",
            base / "ltxv-13b-0.9.8-distilled-fp8.yaml",
            base / "ltxv-13b-0.9.8-distilled.yaml",
        ]
        for cfg in candidates:
            if cfg.exists():
                print(f"[DEBUG] Config selecionada: {cfg}")
                with open(cfg, "r") as file:
                    return yaml.safe_load(file)
        cfg = base / "ltxv-13b-0.9.8-distilled-fp8.yaml"
        print(f"[DEBUG] Config fallback: {cfg}")
        with open(cfg, "r") as file:
            return yaml.safe_load(file)

    def _load_models(self):
        t0 = time.perf_counter()
        LTX_REPO = "Lightricks/LTX-Video"
        print("[DEBUG] Baixando checkpoint principal...")
        distilled_model_path = hf_hub_download(
            repo_id=LTX_REPO,
            filename=self.config["checkpoint_path"],
            local_dir=os.getenv("HF_HOME"),
            cache_dir=os.getenv("HF_HOME_CACHE"),
            token=os.getenv("HF_TOKEN"),
        )
        self.config["checkpoint_path"] = distilled_model_path
        print(f"[DEBUG] Checkpoint em: {distilled_model_path}")

        print("[DEBUG] Baixando upscaler espacial...")
        spatial_upscaler_path = hf_hub_download(
            repo_id=LTX_REPO,
            filename=self.config["spatial_upscaler_model_path"],
            local_dir=os.getenv("HF_HOME"),
            cache_dir=os.getenv("HF_HOME_CACHE"),
            token=os.getenv("HF_TOKEN")
        )
        self.config["spatial_upscaler_model_path"] = spatial_upscaler_path
        print(f"[DEBUG] Upscaler em: {spatial_upscaler_path}")

        print("[DEBUG] Construindo pipeline...")
        pipeline = create_ltx_video_pipeline(
            ckpt_path=self.config["checkpoint_path"],
            precision=self.config["precision"],
            text_encoder_model_name_or_path=self.config["text_encoder_model_name_or_path"],
            sampler=self.config["sampler"],
            device="cpu",
            enhance_prompt=False,
            prompt_enhancer_image_caption_model_name_or_path=self.config["prompt_enhancer_image_caption_model_name_or_path"],
            prompt_enhancer_llm_model_name_or_path=self.config["prompt_enhancer_llm_model_name_or_path"],
        )
        print("[DEBUG] Pipeline pronto.")

        latent_upsampler = None
        if self.config.get("spatial_upscaler_model_path"):
            print("[DEBUG] Construindo latent_upsampler...")
            latent_upsampler = create_latent_upsampler(self.config["spatial_upscaler_model_path"], device="cpu")
            print("[DEBUG] Upsampler pronto.")
        print(f"[DEBUG] _load_models() tempo total={time.perf_counter()-t0:.3f}s")
        return pipeline, latent_upsampler

    def _promote_fp8_weights_to_bf16(self, module):
        if not isinstance(module, torch.nn.Module):
            print("[DEBUG] Promoção FP8→BF16 ignorada: alvo não é nn.Module.")
            return
        f8 = getattr(torch, "float8_e4m3fn", None)
        if f8 is None:
            print("[DEBUG] torch.float8_e4m3fn indisponível.")
            return
        p_cnt = b_cnt = 0
        for _, p in module.named_parameters(recurse=True):
            try:
                if p.dtype == f8:
                    with torch.no_grad():
                        p.data = p.data.to(torch.bfloat16); p_cnt += 1
            except Exception:
                pass
        for _, b in module.named_buffers(recurse=True):
            try:
                if hasattr(b, "dtype") and b.dtype == f8:
                    b.data = b.data.to(torch.bfloat16); b_cnt += 1
            except Exception:
                pass
        print(f"[DEBUG] FP8→BF16: params_promoted={p_cnt}, buffers_promoted={b_cnt}")

    def _apply_precision_policy(self):
        prec = str(self.config.get("precision", "")).lower()
        self.runtime_autocast_dtype = torch.float32
        print(f"[DEBUG] Aplicando política de precisão: {prec}")
        if prec == "float8_e4m3fn":
            self.runtime_autocast_dtype = torch.bfloat16
            force_promote = os.getenv("LTXV_FORCE_BF16_ON_FP8", "0") == "1"
            print(f"[DEBUG] FP8 detectado. force_promote={force_promote}")
            if force_promote and hasattr(torch, "float8_e4m3fn"):
                try:
                    self._promote_fp8_weights_to_bf16(self.pipeline)
                except Exception as e:
                    print(f"[DEBUG] Promoção FP8→BF16 na pipeline falhou: {e}")
                try:
                    if self.latent_upsampler:
                        self._promote_fp8_weights_to_bf16(self.latent_upsampler)
                except Exception as e:
                    print(f"[DEBUG] Promoção FP8→BF16 no upsampler falhou: {e}")
        elif prec == "bfloat16":
            self.runtime_autocast_dtype = torch.bfloat16
        elif prec == "mixed_precision":
            self.runtime_autocast_dtype = torch.float16
        else:
            self.runtime_autocast_dtype = torch.float32

    def _prepare_conditioning_tensor(self, filepath, height, width, padding_values):
        print(f"[DEBUG] Carregando condicionamento: {filepath}")
        tensor = load_image_to_tensor_with_resize_and_crop(filepath, height, width)
        tensor = torch.nn.functional.pad(tensor, padding_values)
        out = tensor.to(self.device, dtype=self.runtime_autocast_dtype) if self.device == "cuda" else tensor.to(self.device)
        print(f"[DEBUG] Cond shape={tuple(out.shape)} dtype={out.dtype} device={out.device}")
        return out


    def _dividir_latentes_por_tamanho(self, latents_brutos, num_latente_por_chunk: int, overlap: int = 1):
        """
        Divide o tensor de latentes em chunks com tamanho definido em número de latentes.
        
        Args:
            latents_brutos: tensor [B, C, T, H, W]
            num_latente_por_chunk: número de latentes por chunk
            overlap: número de frames que se sobrepõem entre chunks
        
        Returns:
            List[tensor]: lista de chunks cloneados
        """
        sum_latent = latents_brutos.shape[2]
        chunks = []
    
        if num_latente_por_chunk >= sum_latent:
            return [latents_brutos.clone()]
    
        n_chunks = (sum_latent) // num_latente_por_chunk 
        steps = sum_latent//n_chunks
        print("================PODA CAUSAL=================")
        print(f"[DEBUG] TOTAL LATENTES = {sum_latent}")
        print(f"[DEBUG] Num LATENTES por chunk = {num_latente_por_chunk}")
        print(f"[DEBUG] Número de chunks = {n_chunks}")


        if n_chunks > 1:
            i = 0
            end=1
            while i < n_chunks:
                start = end-1
                end += num_latente_por_chunk
                if end+2>=sum_latent:
                    end = sum_latent-1
                    i = n_chunks
                else:
                    i += 1
                chunk = latents_brutos[:, :, start:end, :, :].clone()
                chunks.append(chunk)
                print(f"[DEBUG] chunk{i}[:, :, {start}:{end}, :, :] = {chunk.shape[2]}")
        else:
            print(f"[DEBUG] numero chunks minimo")
            print(f"[DEBUG] latents_brutos[:, :, :, :, :] = {latents_brutos.shape[2]}")
            chunks.append(latents_brutos)
        print("================PODA CAUSAL=================")
        return chunks

    def _get_total_frames(self, video_path: str) -> int:
        cmd = [
            "ffprobe",
            "-v", "error",
            "-select_streams", "v:0",
            "-count_frames",
            "-show_entries", "stream=nb_read_frames",
            "-of", "default=nokey=1:noprint_wrappers=1",
            video_path
        ]
        result = subprocess.run(cmd, capture_output=True, text=True, check=True)
        return int(result.stdout.strip())    

    
    
    def _gerar_lista_com_transicoes(self, pasta: str, video_paths: list[str], crossfade_frames: int = 8) -> list[str]:
        """
        Gera uma nova lista de vídeos aplicando transições suaves (blend frame a frame)
        seguindo exatamente a lógica linear de Carlos.
        """
        import os, subprocess, shutil
    
        poda = crossfade_frames
        total_partes = len(video_paths)
        video_fade_fim = None
        video_fade_ini = None
        nova_lista = []

        print("===========CONCATECAO CAUSAL=============")
     
        print(f"[DEBUG] Iniciando pipeline com {total_partes} vídeos e {poda} frames de crossfade")
    
        for i in range(total_partes):
            base = video_paths[i]
        
            # --- PODA ---
            video_podado = os.path.join(pasta, f"{base}_podado_{i}.mp4")
            

            if i<total_partes-1:
                end_frame = self._get_total_frames(base) - poda
            else:
                print(f"[DEBUG] ultima iteracao")
                end_frame = self._get_total_frames(base)
            
            if i>0:
                start_frame = poda
            else:
                start_frame = 0
                print(f"[DEBUG] primeira iteracao")
                
            cmd_fim = (
               f'ffmpeg -y -hide_banner -loglevel error -i "{base}" '
               f'-vf "trim=start_frame={start_frame}:end_frame={end_frame},setpts=PTS-STARTPTS" '
               f'-an "{video_podado}"'
            )
            subprocess.run(cmd_fim, shell=True, check=True)
            
        
            # --- FADE_INI --- 
            if i > 0:
                video_fade_ini = os.path.join(pasta, f"{base}_fade_ini_{i}.mp4")
                cmd_ini = (
                    f'ffmpeg -y -hide_banner -loglevel error -i "{base}" '
                    f'-vf "trim=end_frame={poda},setpts=PTS-STARTPTS" -an "{video_fade_ini}"'
                )
                subprocess.run(cmd_ini, shell=True, check=True)
                
            # --- TRANSIÇÃO ---
            if video_fade_fim and video_fade_ini:
                video_fade  = os.path.join(pasta, f"transicao_{i}_{i+1}.mp4")
                cmd_blend = (
                    f'ffmpeg -y -hide_banner -loglevel error '
                    f'-i "{video_fade_fim}" -i "{video_fade_ini}" '
                    f'-filter_complex "[0:v][1:v]blend=all_expr=\'A*(1-T/{poda})+B*(T/{poda})\',format=yuv420p" '
                    f'-frames:v {poda} "{video_fade}"'
                )
                print(f"[DEBUG] transicao adicionada {i}/{i+1} {self._get_total_frames(video_fade)} frames ")
                subprocess.run(cmd_blend, shell=True, check=True)
                nova_lista.append(video_fade)
                
            # --- FADE_FIM ---
            if i < total_partes - 1:
                video_fade_fim = os.path.join(pasta, f"{base}_fade_fim_{i}.mp4")
                end_frame = self._get_total_frames(base)-poda
                cmd_fim = (
                    f'ffmpeg -y -hide_banner -loglevel error -i "{base}" '
                    f'-vf "trim=start_frame={end_frame},setpts=PTS-STARTPTS" -an "{video_fade_fim}"'
                )
                subprocess.run(cmd_fim, shell=True, check=True)

            nova_lista.append(video_podado)
            print(f"[DEBUG] Video podado {i+1} adicionado {self._get_total_frames(video_podado)} frames ")
               


        print("===========CONCATECAO CAUSAL=============")
        print(f"[DEBUG] {nova_lista}")
        return nova_lista
    
    def _concat_mp4s_no_reencode(self, mp4_list: List[str], out_path: str):
        """
        Concatena múltiplos MP4s sem reencode usando o demuxer do ffmpeg.
        ATENÇÃO: todos os arquivos precisam ter mesmo codec, fps, resolução etc.
        """
        if not mp4_list or len(mp4_list) < 2:
            raise ValueError("Forneça pelo menos dois arquivos MP4 para concatenar.")

        
        # Cria lista temporária para o ffmpeg
        with tempfile.NamedTemporaryFile("w", delete=False, suffix=".txt") as f:
            for mp4 in mp4_list:
                f.write(f"file '{os.path.abspath(mp4)}'\n")
            list_path = f.name
    
        cmd = f"ffmpeg -y -f concat -safe 0 -i {list_path} -c copy {out_path}"
        print(f"[DEBUG] Concat: {cmd}")
    
        try:
            subprocess.check_call(shlex.split(cmd))
        finally:
            try:
                os.remove(list_path)
            except Exception:
                pass   

    
    def generate(
        self,
        prompt,
        negative_prompt,
        mode="text-to-video",
        start_image_filepath=None,
        middle_image_filepath=None,
        middle_frame_number=None,
        middle_image_weight=1.0,
        end_image_filepath=None,
        end_image_weight=1.0,
        input_video_filepath=None,
        height=512,
        width=704,
        duration=2.0,
        frames_to_use=9,
        seed=42,
        randomize_seed=True,
        guidance_scale=3.0,
        improve_texture=True,
        progress_callback=None,
        # Sempre latent → VAE → MP4 (simples)
        external_decode=True,
    ):
        t_all = time.perf_counter()
        print(f"[DEBUG] generate() begin mode={mode} external_decode={external_decode} improve_texture={improve_texture}")
        if self.device == "cuda":
            torch.cuda.empty_cache(); torch.cuda.reset_peak_memory_stats()
        self._log_gpu_memory("Início da Geração")

        if mode == "image-to-video" and not start_image_filepath:
            raise ValueError("A imagem de início é obrigatória para o modo image-to-video")
        if mode == "video-to-video" and not input_video_filepath:
            raise ValueError("O vídeo de entrada é obrigatório para o modo video-to-video")

        used_seed = random.randint(0, 2**32 - 1) if randomize_seed else int(seed)
        seed_everething(used_seed); print(f"[DEBUG] Seed usado: {used_seed}")

        FPS = 24.0; MAX_NUM_FRAMES = 2570
        target_frames_rounded = round(duration * FPS)
        n_val = round((float(target_frames_rounded) - 1.0) / 8.0)
        actual_num_frames = max(9, min(MAX_NUM_FRAMES, int(n_val * 8 + 1)))
        print(f"[DEBUG] Frames alvo: {actual_num_frames} (dur={duration}s @ {FPS}fps)")

        height_padded = ((height - 1) // 32 + 1) * 32
        width_padded = ((width - 1) // 32 + 1) * 32
        padding_values = calculate_padding(height, width, height_padded, width_padded)
        print(f"[DEBUG] Dimensões: ({height},{width}) -> pad ({height_padded},{width_padded}); padding={padding_values}")

        generator = torch.Generator(device=self.device).manual_seed(used_seed)
        conditioning_items = []

        if mode == "image-to-video":
            start_tensor = self._prepare_conditioning_tensor(start_image_filepath, height, width, padding_values)
            conditioning_items.append(ConditioningItem(start_tensor, 0, 1.0))
            if middle_image_filepath and middle_frame_number is not None:
                middle_tensor = self._prepare_conditioning_tensor(middle_image_filepath, height, width, padding_values)
                safe_middle_frame = max(0, min(int(middle_frame_number), actual_num_frames - 1))
                conditioning_items.append(ConditioningItem(middle_tensor, safe_middle_frame, float(middle_image_weight)))
            if end_image_filepath:
                end_tensor = self._prepare_conditioning_tensor(end_image_filepath, height, width, padding_values)
                last_frame_index = actual_num_frames - 1
                conditioning_items.append(ConditioningItem(end_tensor, last_frame_index, float(end_image_weight)))
            print(f"[DEBUG] Conditioning items: {len(conditioning_items)}")

        # Sempre pedimos latentes (simples)
        call_kwargs = {
            "prompt": prompt,
            "negative_prompt": negative_prompt,
            "height": height_padded,
            "width": width_padded,
            "num_frames": actual_num_frames,
            "frame_rate": int(FPS),
            "generator": generator,
            "output_type": "latent",
            "conditioning_items": conditioning_items if conditioning_items else None,
            "media_items": None,
            "decode_timestep": self.config["decode_timestep"],
            "decode_noise_scale": self.config["decode_noise_scale"],
            "stochastic_sampling": self.config["stochastic_sampling"],
            "image_cond_noise_scale": 0.01,
            "is_video": True,
            "vae_per_channel_normalize": True,
            "mixed_precision": (self.config["precision"] == "mixed_precision"),
            "offload_to_cpu": False,
            "enhance_prompt": False,
            "skip_layer_strategy": SkipLayerStrategy.AttentionValues,
        }
        print(f"[DEBUG] output_type={call_kwargs['output_type']} skip_layer_strategy={call_kwargs['skip_layer_strategy']}")

        if mode == "video-to-video":
            media = load_media_file(
                media_path=input_video_filepath,
                height=height,
                width=width,
                max_frames=int(frames_to_use),
                padding=padding_values,
            ).to(self.device)
            call_kwargs["media_items"] = media
            print(f"[DEBUG] media_items shape={tuple(media.shape)}")

        latents = None
        multi_scale_pipeline = None

        try:
            if improve_texture:
                if not self.latent_upsampler:
                    raise ValueError("Upscaler espacial não carregado.")
                print("[DEBUG] Multi-escala: construindo pipeline...")
                multi_scale_pipeline = LTXMultiScalePipeline(self.pipeline, self.latent_upsampler)
                first_pass_args = self.config.get("first_pass", {}).copy()
                first_pass_args["guidance_scale"] = float(guidance_scale)
                second_pass_args = self.config.get("second_pass", {}).copy()
                second_pass_args["guidance_scale"] = float(guidance_scale)

                multi_scale_call_kwargs = call_kwargs.copy()
                multi_scale_call_kwargs.update(
                    {
                        "downscale_factor": self.config["downscale_factor"],
                        "first_pass": first_pass_args,
                        "second_pass": second_pass_args,
                    }
                )
                print("[DEBUG] Chamando multi_scale_pipeline...")
                t_ms = time.perf_counter()
                ctx = torch.autocast(device_type="cuda", dtype=self.runtime_autocast_dtype) if self.device == "cuda" else contextlib.nullcontext()
                with ctx:
                    result = multi_scale_pipeline(**multi_scale_call_kwargs)
                print(f"[DEBUG] multi_scale_pipeline tempo={time.perf_counter()-t_ms:.3f}s")

                if hasattr(result, "latents"):
                    latents = result.latents
                elif hasattr(result, "images") and isinstance(result.images, torch.Tensor):
                    latents = result.images
                else:
                    latents = result
                print(f"[DEBUG] Latentes (multi-escala): shape={tuple(latents.shape)}")
            else:
                single_pass_kwargs = call_kwargs.copy()
                first_pass_config = self.config.get("first_pass", {})
                single_pass_kwargs.update(
                    {
                        "guidance_scale": float(guidance_scale),
                        "stg_scale": first_pass_config.get("stg_scale"),
                        "rescaling_scale": first_pass_config.get("rescaling_scale"),
                        "skip_block_list": first_pass_config.get("skip_block_list"),
                    }
                )
                schedule = first_pass_config.get("timesteps") or first_pass_config.get("guidance_timesteps")
                if mode == "video-to-video":
                    schedule = [0.7]; print("[INFO] Modo video-to-video (etapa única): timesteps=[0.7]")
                if isinstance(schedule, (list, tuple)) and len(schedule) > 0:
                    single_pass_kwargs["timesteps"] = schedule
                    single_pass_kwargs["guidance_timesteps"] = schedule
                print(f"[DEBUG] Single-pass: timesteps_len={len(schedule) if schedule else 0}")

                print("\n[INFO] Executando pipeline de etapa única...")
                t_sp = time.perf_counter()
                ctx = torch.autocast(device_type="cuda", dtype=self.runtime_autocast_dtype) if self.device == "cuda" else contextlib.nullcontext()
                with ctx:
                    result = self.pipeline(**single_pass_kwargs)
                print(f"[DEBUG] single-pass tempo={time.perf_counter()-t_sp:.3f}s")

                if hasattr(result, "latents"):
                    latents = result.latents
                elif hasattr(result, "images") and isinstance(result.images, torch.Tensor):
                    latents = result.images
                else:
                    latents = result
                print(f"[DEBUG] Latentes (single-pass): shape={tuple(latents.shape)}")

            # Staging e escrita MP4 (simples: VAE → pixels → MP4)
            
            latents_cpu = latents.detach().to("cpu", non_blocking=True)
            torch.cuda.empty_cache()
            try:
                torch.cuda.ipc_collect()
            except Exception:
                pass
                
            latents_parts = self._dividir_latentes_por_tamanho(latents_cpu,4,1)
            
            temp_dir = tempfile.mkdtemp(prefix="ltxv_"); self._register_tmp_dir(temp_dir)
            results_dir = "/app/output"; os.makedirs(results_dir, exist_ok=True)

            partes_mp4 = []
            par = 0
            
            for latents in latents_parts:
                print(f"[DEBUG] Partição {par}: {tuple(latents.shape)}")
       
                par = par + 1
                output_video_path = os.path.join(temp_dir, f"output_{used_seed}_{par}.mp4")
                final_output_path = None
    
                print("[DEBUG] Decodificando bloco de latentes com VAE → tensor de pixels...")
                # Usar manager com timestep por item; previne target_shape e rota NoneType.decode
                pixel_tensor = vae_manager_singleton.decode(
                    latents.to(self.device, non_blocking=True),
                    decode_timestep=float(self.config.get("decode_timestep", 0.05))
                )
                log_tensor_info(pixel_tensor, "Pixel tensor (VAE saída)")
    
                print("[DEBUG] Codificando MP4 a partir do tensor de pixels (bloco inteiro)...")
                video_encode_tool_singleton.save_video_from_tensor(
                    pixel_tensor,
                    output_video_path,
                    fps=call_kwargs["frame_rate"],
                    progress_callback=progress_callback
                )
    
                candidate = os.path.join(results_dir, f"output_par_{par}.mp4")
                try:
                    shutil.move(output_video_path, candidate)
                    final_output_path = candidate
                    print(f"[DEBUG] MP4 parte {par} movido para {final_output_path}")
                    partes_mp4.append(final_output_path)
                    
                except Exception as e:
                    final_output_path = output_video_path
                    print(f"[DEBUG] Falha no move; usando tmp como final: {e}")

            total_partes = len(partes_mp4)
            if (total_partes>1):
                final_vid = os.path.join(results_dir, f"concat_fim_{used_seed}.mp4")
                partes_mp4_fade = self._gerar_lista_com_transicoes(pasta=results_dir, video_paths=partes_mp4, crossfade_frames=8)
                self._concat_mp4s_no_reencode(partes_mp4_fade, final_vid)
            else:
                final_vid = partes_mp4[0]
            
            
            self._log_gpu_memory("Fim da Geração")
            return final_concat, used_seed
            

        except Exception as e:
            print("[DEBUG] EXCEÇÃO NA GERAÇÃO:")
            print("".join(traceback.format_exception(type(e), e, e.__traceback__)))
            raise
        finally:
            try:
                del latents
            except Exception:
                pass
            try:
                del multi_scale_pipeline
            except Exception:
                pass

            gc.collect()
            try:
                if self.device == "cuda":
                    torch.cuda.empty_cache()
                    try:
                        torch.cuda.ipc_collect()
                    except Exception:
                        pass
            except Exception as e:
                print(f"[DEBUG] Limpeza GPU no finally falhou: {e}")

            try:
                self.finalize(keep_paths=[])
            except Exception as e:
                print(f"[DEBUG] finalize() no finally falhou: {e}")

print("Criando instância do VideoService. O carregamento do modelo começará agora...")
video_generation_service = VideoService()