import av
import os

设置Transformers缓存路径

os.environ['HF_HOME'] = 'D:\appsfuzhu\transformers_cache'
import torch
import numpy as np
from huggingface_hub import hf_hub_download
from transformers import LlavaNextVideoForConditionalGeneration, LlavaNextVideoProcessor

def read_video_pyav(container, indices):
'''
Decode the video with PyAV decoder.
Args:
container (av.container.input.InputContainer): PyAV container.
indices (List[int]): List of frame indices to decode.
Returns:
result (np.ndarray): np array of decoded frames of shape (num_frames, height, width, 3).
'''
frames = []
container.seek(0)
start_index = indices[0]
end_index = indices[-1]
for i, frame in enumerate(container.decode(video=0)):
if i > end_index:
break
if i >= start_index and i in indices:
frames.append(frame)
return np.stack([x.to_ndarray(format="rgb24") for x in frames])

Load the model in half-precision

model = LlavaNextVideoForConditionalGeneration.from_pretrained("llava-hf/LLaVA-NeXT-Video-7B-hf", torch_dtype=torch.float16, device_map="auto")
processor = LlavaNextVideoProcessor.from_pretrained("llava-hf/LLaVA-NeXT-Video-7B-hf")

Load the video as an np.array, sampling uniformly 8 frames (can sample more for longer videos)

video_path = hf_hub_download(repo_id="raushan-testing-hf/videos-test", filename="sample_demo_1.mp4", repo_type="dataset")
container = av.open(video_path)
total_frames = container.streams.video[0].frames
indices = np.arange(0, total_frames, total_frames / 8).astype(int)
video = read_video_pyav(container, indices)

conversation = [
{

    "role": "user",
    "content": [
        {"type": "text", "text": "Why is this video funny?"},
        {"type": "video"},
        ],
},

]

prompt = processor.apply_chat_template(conversation, add_generation_prompt=True)
inputs = processor(text=prompt, videos=video, return_tensors="pt")

out = model.generate(**inputs, max_new_tokens=60)
processor.batch_decode(out, skip_special_tokens=True, clean_up_tokenization_spaces=True)