40b9867a

Minimal Dataset extract_images 解帧发绿

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```python python scripts/realtime4dv/extract_images.py --data_root data/renbody/0013_01 ``` 解帧得到的图片发绿：  NHR, renbody 都存在这个问题，zju_mocap则没有出现这个问题。 ffmpeg安装方式： ```shell sudo add-apt-repository ppa:savoury1/ffmpeg4 sudo apt update sudo apt install ffmpeg ```

The code below is from `gaussian_splatting/scene/dataset_readers.py`. 1. I wonder if this is from colmap or someother places? 2. I try to use the transforms.json and PLY file exported from NGP...