1.视频一帧一帧处理，以人脸识别为例

cv2只能输出avi格式的视频

  1. import numpy as np
  2. import cv2
  3. import matplotlib.pyplot as plt
  5. cap = cv2.VideoCapture("images/2.mp4")
  6. fourcc = cv2.VideoWriter_fourcc(*'XVID')
  7. out = cv2.VideoWriter("1.avi", fourcc, 20, (544, 960))
  8. while cap.isOpened():
  9.     ret, imgs = cap.read()
  10.     urlXml = 'D:/Users/24268/anaconda3/envs/python_keras/Lib/site-packages/cv2/data/'
  11.     # img = cv2.imread(imgs)
  12.     faceCascade = cv2.CascadeClassifier(urlXml + 'haarcascade_frontalface_default.xml')
  14.     if ret is True:
  15.         gray = cv2.cvtColor(imgs, cv2.COLOR_BGR2GRAY)
  16.         faces = faceCascade.detectMultiScale(
  17.             gray, scaleFactor=1.15, minNeighbors=5, minSize=(5, 5)
  18.         )
  19.         # print(faces)
  20.         print(len(faces))
  22.         for (x, y, w, h) in faces:
  23.             cv2.circle(imgs, (int((x + x + w) / 2), int((y + y + h) / 2)), int(w / 2), (0, 255, 0), 2)
  25.     cv2.imshow("renlian", imgs)
  26.     cv2.waitKey(1)
  27.     out.write(imgs)
  29. cap.release()
  30. out.release()

2.avi视频转mp4

  1. import os
  2. ffmpeg = r'C:\Users\24268\Desktop\ffmpeg-N-102809-gde8e6e67e7-win64-gpl-shared\ffmpeg-N-102809-gde8e6e67e7-win64-gpl-shared\bin\ffmpeg.exe'  # 写自己的安装路径
  3. # 由于路径中有空格，所以路径需要用上双引号，否则会找不到该文件
  4. cmd = ffmpeg + " -i " + '1.avi' + " -c copy " + '2.mp4'
  5. os.system(cmd)
  6. print("done")

3.音频处理 为解决cv2处理视频没声音

  1. from moviepy.editor import *
  3. # # 提取声音
  4. # video = VideoFileClip('阿姨人脸识别.mp4')
  5. # audio = video.audio  # 没他也没事
  6. # audio.write_audiofile('test.mp3')
  9. # 获取视频
  10. video_clip = VideoFileClip('阿姨人脸识别.mp4')
  11. # 获取音频
  12. audio_clip = AudioFileClip('test.mp3')
  13. # 视频里面添加声音
  14. final_video = video_clip.set_audio(audio_clip)
  15. # 保存视频
  16. final_video.write_videofile("123.mp4")