# 将彩色视频转为灰度视频
import imageio
 
reader = imageio.get_reader('imageio:cockatoo.mp4')
fps = reader.get_meta_data()['fps']
 
writer = imageio.get_writer('~/cockatoo_gray.mp4', fps=fps)
 
for im in reader:
 writer.append_data(im[:, :, 1])
writer.close()

imageio.core.fetching.NeedDownloadError: Need ffmpeg exe. You can obtain it with either:
 - install using conda: conda install ffmpeg -c conda-forge
 - download by calling: imageio.plugins.ffmpeg.download()

conda install ffmpeg -c conda-forge

conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/
conda config --set show_channel_urls yes

import cv2 
 
cap = cv2.VideoCapture('/path/to/your/video.mp4') 
 
while(cap.isOpened()): 
 ret, frame = cap.read() 
 cv2.imshow('image', frame) 
 k = cv2.waitKey(20) 
 #q键退出
 if (k & 0xff == ord('q')): 
  break 
 
cap.release() 
cv2.destroyAllWindows()