generate_multitalk.py

# Copyright 2024-2025 The Alibaba Wan Team Authors. All rights reserved.
import argparse
import logging
import os
import sys
import json
import warnings
from datetime import datetime

warnings.filterwarnings('ignore')

import random

import torch
import torch.distributed as dist
from PIL import Image
import subprocess

import wan
from wan.configs import SIZE_CONFIGS, SUPPORTED_SIZES, WAN_CONFIGS
from wan.utils.utils import cache_image, cache_video, str2bool
from wan.utils.multitalk_utils import save_video_ffmpeg

from transformers import Wav2Vec2FeatureExtractor
from src.audio_analysis.wav2vec2 import Wav2Vec2Model

import librosa
import pyloudnorm as pyln
import numpy as np
from einops import rearrange
import soundfile as sf

def _validate_args(args):
    # Basic check
    assert args.ckpt_dir is not None, "Please specify the checkpoint directory."
    assert args.task in WAN_CONFIGS, f"Unsupport task: {args.task}"

    # The default sampling steps are 40 for image-to-video tasks and 50 for text-to-video tasks.
    if args.sample_steps is None:
        args.sample_steps = 40

    if args.sample_shift is None:
        if args.size == 'multitalk-480':
            args.sample_shift = 7
        elif args.size == 'multitalk-720':
            args.sample_shift = 11
        else:
            raise NotImplementedError(f'Not supported size')

    args.base_seed = args.base_seed if args.base_seed >= 0 else random.randint(
        0, 99999999)
    # Size check
    assert args.size in SUPPORTED_SIZES[
        args.
        task], f"Unsupport size {args.size} for task {args.task}, supported sizes are: {', '.join(SUPPORTED_SIZES[args.task])}"


def _parse_args():
    parser = argparse.ArgumentParser(
        description="Generate a image or video from a text prompt or image using Wan"
    )
    parser.add_argument(
        "--task",
        type=str,
        default="multitalk-14B",
        choices=list(WAN_CONFIGS.keys()),
        help="The task to run.")
    parser.add_argument(
        "--size",
        type=str,
        default="multitalk-480",
        choices=list(SIZE_CONFIGS.keys()),
        help="The buckget size of the generated video. The aspect ratio of the output video will follow that of the input image."
    )
    parser.add_argument(
        "--frame_num",
        type=int,
        default=81,
        help="How many frames to be generated in one clip. The number should be 4n+1"
    )
    parser.add_argument(
        "--ckpt_dir",
        type=str,
        default=None,
        help="The path to the Wan checkpoint directory.")
    parser.add_argument(
        "--wav2vec_dir",
        type=str,
        default=None,
        help="The path to the wav2vec checkpoint directory.")
    parser.add_argument(
        "--offload_model",
        type=str2bool,
        default=None,
        help="Whether to offload the model to CPU after each model forward, reducing GPU memory usage."
    )
    parser.add_argument(
        "--ulysses_size",
        type=int,
        default=1,
        help="The size of the ulysses parallelism in DiT.")
    parser.add_argument(
        "--ring_size",
        type=int,
        default=1,
        help="The size of the ring attention parallelism in DiT.")
    parser.add_argument(
        "--t5_fsdp",
        action="store_true",
        default=False,
        help="Whether to use FSDP for T5.")
    parser.add_argument(
        "--t5_cpu",
        action="store_true",
        default=False,
        help="Whether to place T5 model on CPU.")
    parser.add_argument(
        "--dit_fsdp",
        action="store_true",
        default=False,
        help="Whether to use FSDP for DiT.")
    parser.add_argument(
        "--save_file",
        type=str,
        default=None,
        help="The file to save the generated image or video to.")
    parser.add_argument(
        "--audio_save_dir",
        type=str,
        default='save_audio',
        help="The path to save the audio embedding.")
    parser.add_argument(
        "--base_seed",
        type=int,
        default=42,
        help="The seed to use for generating the image or video.")
    parser.add_argument(
        "--input_json",
        type=str,
        default='examples.json',
        help="[meta file] The condition path to generate the video.")
    parser.add_argument(
        "--motion_frame",
        type=int,
        default=25,
        help="Driven frame length used in the mode of long video genration.")
    parser.add_argument(
        "--mode",
        type=str,
        default="clip",
        choices=['clip', 'streaming'],
        help="clip: generate one video chunk, streaming: long video generation")
    parser.add_argument(
        "--sample_steps", type=int, default=None, help="The sampling steps.")
    parser.add_argument(
        "--sample_shift",
        type=float,
        default=None,
        help="Sampling shift factor for flow matching schedulers.")
    parser.add_argument(
        "--sample_text_guide_scale",
        type=float,
        default=5.0,
        help="Classifier free guidance scale for text control.")
    parser.add_argument(
        "--sample_audio_guide_scale",
        type=float,
        default=4.0,
        help="Classifier free guidance scale for audio control.")
    parser.add_argument(
        "--num_persistent_param_in_dit",
        type=int,
        default=None,
        required=False,
        help="Maximum parameter quantity retained in video memory, small number to reduce VRAM required",
    )
    parser.add_argument(
        "--use_teacache",
        action="store_true",
        default=False,
        help="Enable teacache for video generation."
    )
    parser.add_argument(
        "--teacache_thresh",
        type=float,
        default=0.2,
        help="Threshold for teacache."
    )
    parser.add_argument(
        "--use_apg",
        action="store_true",
        default=False,
        help="Enable adaptive projected guidance for video generation (APG)."
    )
    parser.add_argument(
        "--apg_momentum",
        type=float,
        default=-0.75,
        help="Momentum used in adaptive projected guidance (APG)."
    )
    parser.add_argument(
        "--apg_norm_threshold",
        type=float,
        default=55,
        help="Norm threshold used in adaptive projected guidance (APG)."
    )

    
    args = parser.parse_args()

    _validate_args(args)

    return args

def custom_init(device, wav2vec):    
    audio_encoder = Wav2Vec2Model.from_pretrained(wav2vec, local_files_only=True).to(device)
    audio_encoder.feature_extractor._freeze_parameters()
    wav2vec_feature_extractor = Wav2Vec2FeatureExtractor.from_pretrained(wav2vec, local_files_only=True)
    return wav2vec_feature_extractor, audio_encoder

def loudness_norm(audio_array, sr=16000, lufs=-23):
    meter = pyln.Meter(sr)
    loudness = meter.integrated_loudness(audio_array)
    if abs(loudness) > 100:
        return audio_array
    normalized_audio = pyln.normalize.loudness(audio_array, loudness, lufs)
    return normalized_audio

def audio_prepare_multi(left_path, right_path, audio_type, sample_rate=16000):

    if not (left_path=='None' or right_path=='None'):
        human_speech_array1 = audio_prepare_single(left_path)
        human_speech_array2 = audio_prepare_single(right_path)
    elif left_path=='None':
        human_speech_array2 = audio_prepare_single(right_path)
        human_speech_array1 = np.zeros(human_speech_array2.shape[0])
    elif right_path=='None':
        human_speech_array1 = audio_prepare_single(left_path)
        human_speech_array2 = np.zeros(human_speech_array1.shape[0])

    if audio_type=='para':
        new_human_speech1 = human_speech_array1
        new_human_speech2 = human_speech_array2
    elif audio_type=='add':
        new_human_speech1 = np.concatenate([human_speech_array1[: human_speech_array1.shape[0]], np.zeros(human_speech_array2.shape[0])]) 
        new_human_speech2 = np.concatenate([np.zeros(human_speech_array1.shape[0]), human_speech_array2[:human_speech_array2.shape[0]]])
    sum_human_speechs = new_human_speech1 + new_human_speech2
    return new_human_speech1, new_human_speech2, sum_human_speechs

def _init_logging(rank):
    # logging
    if rank == 0:
        # set format
        logging.basicConfig(
            level=logging.INFO,
            format="[%(asctime)s] %(levelname)s: %(message)s",
            handlers=[logging.StreamHandler(stream=sys.stdout)])
    else:
        logging.basicConfig(level=logging.ERROR)

def get_embedding(speech_array, wav2vec_feature_extractor, audio_encoder, sr=16000, device='cpu'):
    audio_duration = len(speech_array) / sr
    video_length = audio_duration * 25 # Assume the video fps is 25

    # wav2vec_feature_extractor
    audio_feature = np.squeeze(
        wav2vec_feature_extractor(speech_array, sampling_rate=sr).input_values
    )
    audio_feature = torch.from_numpy(audio_feature).float().to(device=device)
    audio_feature = audio_feature.unsqueeze(0)

    # audio encoder
    with torch.no_grad():
        embeddings = audio_encoder(audio_feature, seq_len=int(video_length), output_hidden_states=True)

    if len(embeddings) == 0:
        print("Fail to extract audio embedding")
        return None

    audio_emb = torch.stack(embeddings.hidden_states[1:], dim=1).squeeze(0)
    audio_emb = rearrange(audio_emb, "b s d -> s b d")

    audio_emb = audio_emb.cpu().detach()
    return audio_emb

def extract_audio_from_video(filename, sample_rate):
    raw_audio_path = filename.split('/')[-1].split('.')[0]+'.wav'
    ffmpeg_command = [
        "ffmpeg",
        "-y",
        "-i",
        str(filename),
        "-vn",
        "-acodec",
        "pcm_s16le",
        "-ar",
        "16000",
        "-ac",
        "2",
        str(raw_audio_path),
    ]
    subprocess.run(ffmpeg_command, check=True)
    human_speech_array, sr = librosa.load(raw_audio_path, sr=sample_rate)
    human_speech_array = loudness_norm(human_speech_array, sr)
    os.remove(raw_audio_path)

    return human_speech_array

def audio_prepare_single(audio_path, sample_rate=16000):
    ext = os.path.splitext(audio_path)[1].lower()
    if ext in ['.mp4', '.mov', '.avi', '.mkv']:
        human_speech_array = extract_audio_from_video(audio_path, sample_rate)
        return human_speech_array
    else:
        human_speech_array, sr = librosa.load(audio_path, sr=sample_rate)
        human_speech_array = loudness_norm(human_speech_array, sr)
        return human_speech_array

def generate(args):
    rank = int(os.getenv("RANK", 0))
    world_size = int(os.getenv("WORLD_SIZE", 1))
    local_rank = int(os.getenv("LOCAL_RANK", 0))
    device = local_rank
    _init_logging(rank)

    if args.offload_model is None:
        args.offload_model = False if world_size > 1 else True
        logging.info(
            f"offload_model is not specified, set to {args.offload_model}.")
    if world_size > 1:
        torch.cuda.set_device(local_rank)
        dist.init_process_group(
            backend="nccl",
            init_method="env://",
            rank=rank,
            world_size=world_size)
    else:
        assert not (
            args.t5_fsdp or args.dit_fsdp
        ), f"t5_fsdp and dit_fsdp are not supported in non-distributed environments."
        assert not (
            args.ulysses_size > 1 or args.ring_size > 1
        ), f"context parallel are not supported in non-distributed environments."

    if args.ulysses_size > 1 or args.ring_size > 1:
        assert args.ulysses_size * args.ring_size == world_size, f"The number of ulysses_size and ring_size should be equal to the world size."
        from xfuser.core.distributed import (
            init_distributed_environment,
            initialize_model_parallel,
        )
        init_distributed_environment(
            rank=dist.get_rank(), world_size=dist.get_world_size())

        initialize_model_parallel(
            sequence_parallel_degree=dist.get_world_size(),
            ring_degree=args.ring_size,
            ulysses_degree=args.ulysses_size,
        )

    # TODO: use prompt refine
    # if args.use_prompt_extend:
    #     if args.prompt_extend_method == "dashscope":
    #         prompt_expander = DashScopePromptExpander(
    #             model_name=args.prompt_extend_model,
    #             is_vl="i2v" in args.task or "flf2v" in args.task)
    #     elif args.prompt_extend_method == "local_qwen":
    #         prompt_expander = QwenPromptExpander(
    #             model_name=args.prompt_extend_model,
    #             is_vl="i2v" in args.task,
    #             device=rank)
    #     else:
    #         raise NotImplementedError(
    #             f"Unsupport prompt_extend_method: {args.prompt_extend_method}")

    cfg = WAN_CONFIGS[args.task]
    if args.ulysses_size > 1:
        assert cfg.num_heads % args.ulysses_size == 0, f"`{cfg.num_heads=}` cannot be divided evenly by `{args.ulysses_size=}`."

    logging.info(f"Generation job args: {args}")
    logging.info(f"Generation model config: {cfg}")

    if dist.is_initialized():
        base_seed = [args.base_seed] if rank == 0 else [None]
        dist.broadcast_object_list(base_seed, src=0)
        args.base_seed = base_seed[0]

    assert args.task == "multitalk-14B", 'You should choose multitalk in args.task.'
    

    # TODO: add prompt refine
    # img = Image.open(args.image).convert("RGB")
    # if args.use_prompt_extend:
    #     logging.info("Extending prompt ...")
    #     if rank == 0:
    #         prompt_output = prompt_expander(
    #             args.prompt,
    #             tar_lang=args.prompt_extend_target_lang,
    #             image=img,
    #             seed=args.base_seed)
    #         if prompt_output.status == False:
    #             logging.info(
    #                 f"Extending prompt failed: {prompt_output.message}")
    #             logging.info("Falling back to original prompt.")
    #             input_prompt = args.prompt
    #         else:
    #             input_prompt = prompt_output.prompt
    #         input_prompt = [input_prompt]
    #     else:
    #         input_prompt = [None]
    #     if dist.is_initialized():
    #         dist.broadcast_object_list(input_prompt, src=0)
    #     args.prompt = input_prompt[0]
    #     logging.info(f"Extended prompt: {args.prompt}")

    # read input files

    

    with open(args.input_json, 'r', encoding='utf-8') as f:
        input_data = json.load(f)
        
        wav2vec_feature_extractor, audio_encoder= custom_init('cpu', args.wav2vec_dir)
        args.audio_save_dir = os.path.join(args.audio_save_dir, input_data['cond_image'].split('/')[-1].split('.')[0])
        os.makedirs(args.audio_save_dir,exist_ok=True)
        
        if len(input_data['cond_audio'])==2:
            new_human_speech1, new_human_speech2, sum_human_speechs = audio_prepare_multi(input_data['cond_audio']['person1'], input_data['cond_audio']['person2'], input_data['audio_type'])
            audio_embedding_1 = get_embedding(new_human_speech1, wav2vec_feature_extractor, audio_encoder)
            audio_embedding_2 = get_embedding(new_human_speech2, wav2vec_feature_extractor, audio_encoder)
            emb1_path = os.path.join(args.audio_save_dir, '1.pt')
            emb2_path = os.path.join(args.audio_save_dir, '2.pt')
            sum_audio = os.path.join(args.audio_save_dir, 'sum.wav')
            sf.write(sum_audio, sum_human_speechs, 16000)
            torch.save(audio_embedding_1, emb1_path)
            torch.save(audio_embedding_2, emb2_path)
            input_data['cond_audio']['person1'] = emb1_path
            input_data['cond_audio']['person2'] = emb2_path
            input_data['video_audio'] = sum_audio
        elif len(input_data['cond_audio'])==1:
            human_speech = audio_prepare_single(input_data['cond_audio']['person1'])
            audio_embedding = get_embedding(human_speech, wav2vec_feature_extractor, audio_encoder)
            emb_path = os.path.join(args.audio_save_dir, '1.pt')
            sum_audio = os.path.join(args.audio_save_dir, 'sum.wav')
            sf.write(sum_audio, human_speech, 16000)
            torch.save(audio_embedding, emb_path)
            input_data['cond_audio']['person1'] = emb_path
            input_data['video_audio'] = sum_audio

    logging.info("Creating MultiTalk pipeline.")
    wan_i2v = wan.MultiTalkPipeline(
        config=cfg,
        checkpoint_dir=args.ckpt_dir,
        device_id=device,
        rank=rank,
        t5_fsdp=args.t5_fsdp,
        dit_fsdp=args.dit_fsdp, 
        use_usp=(args.ulysses_size > 1 or args.ring_size > 1),  
        t5_cpu=args.t5_cpu
    )

    if args.num_persistent_param_in_dit is not None:
        wan_i2v.vram_management = True
        wan_i2v.enable_vram_management(
            num_persistent_param_in_dit=args.num_persistent_param_in_dit
        )
    
    logging.info("Generating video ...")
    video = wan_i2v.generate(
        input_data,
        size_buckget=args.size,
        motion_frame=args.motion_frame,
        frame_num=args.frame_num,
        shift=args.sample_shift,
        sampling_steps=args.sample_steps,
        text_guide_scale=args.sample_text_guide_scale,
        audio_guide_scale=args.sample_audio_guide_scale,
        seed=args.base_seed,
        offload_model=args.offload_model,
        max_frames_num=args.frame_num if args.mode == 'clip' else 1000,
        extra_args=args,
        )
    

    if rank == 0:
        
        if args.save_file is None:
            formatted_time = datetime.now().strftime("%Y%m%d_%H%M%S")
            formatted_prompt = input_data['prompt'].replace(" ", "_").replace("/",
                                                                        "_")[:50]
            args.save_file = f"{args.task}_{args.size.replace('*','x') if sys.platform=='win32' else args.size}_{args.ulysses_size}_{args.ring_size}_{formatted_prompt}_{formatted_time}"
        
        logging.info(f"Saving generated video to {args.save_file}.mp4")
        save_video_ffmpeg(video, args.save_file, [input_data['video_audio']])
        
    logging.info("Finished.")


if __name__ == "__main__":
    args = _parse_args()
    generate(args)