import cv2
 
def videocapture():
    cap=cv2.VideoCapture(0)     #生成讀取攝像頭對(duì)象
    width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))  #獲取視頻的寬度
    height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))  #獲取視頻的高度
    fps = cap.get(cv2.CAP_PROP_FPS) #獲取視頻的幀率
    fourcc = int(cap.get(cv2.CAP_PROP_FOURCC))    #視頻的編碼
    #定義視頻對(duì)象輸出
    writer = cv2.VideoWriter("video_result.mp4", fourcc, fps, (width, height))
    while cap.isOpened():
        ret, frame = cap.read() #讀取攝像頭畫面
        cv2.imshow('teswell', frame) #顯示畫面
        key = cv2.waitKey(24)
        writer.write(frame)  #視頻保存
        # 按Q退出
        if key == ord('q'):
            break
    cap.release()         #釋放攝像頭
    cv2.destroyAllWindows() #釋放所有顯示圖像窗口
 
if __name__ == '__main__' :
 
    videocapture()

import numpy as np
import cv2
import os
 
def video2image(video_dir,save_dir):
    cap = cv2.VideoCapture(video_dir) #生成讀取視頻對(duì)象
    n = 1   #計(jì)數(shù)
    width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))    #獲取視頻的寬度
    height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))   #獲取視頻的高度
    fps = cap.get(cv2.CAP_PROP_FPS)    #獲取視頻的幀率
    fourcc = int(cap.get(cv2.CAP_PROP_FOURCC))    #視頻的編碼
    # 定義視頻輸出
    #writer = cv2.VideoWriter("teswellvideo_02_result.mp4", fourcc, fps, (width, height))
    i = 0
    timeF = int(fps)     #視頻幀計(jì)數(shù)間隔頻率
    while cap.isOpened():
        ret,frame = cap.read() #按幀讀取視頻
        #到視頻結(jié)尾時(shí)終止
        if ret is False :
            break
        #每隔timeF幀進(jìn)行存儲(chǔ)操作
        if (n % timeF == 0) :
            i += 1
            print('保存第 %s 張圖像' % i)
            save_image_dir = os.path.join(save_dir,'%s.jpg' % i)
            print('save_image_dir: ', save_image_dir)
            cv2.imwrite(save_image_dir,frame) #保存視頻幀圖像
        n = n + 1
        cv2.waitKey(1) #延時(shí)1ms
    cap.release() #釋放視頻對(duì)象
 
#讀取文件夾所有視頻，每個(gè)視頻按幀保存圖像
def video2image_multi(video_path,save_path):
    video_list = os.listdir(video_path)
    
    for i in range(len(video_list)) :      
        video_dir = os.path.join(video_path,video_list[i])
        cap = cv2.VideoCapture(video_dir)
        fps = cap.get(cv2.CAP_PROP_FPS)     # 視頻的幀率
        save_num = 0
        n = 1           #計(jì)數(shù)
        timeF = int(fps)          # 視頻幀計(jì)數(shù)間隔頻率
        while cap.isOpened():
            ret,frame = cap.read()
            if ret is False :
                break
            #每隔timeF幀進(jìn)行存儲(chǔ)操作
            if (n % timeF == 0) :
                save_num += 1
                save_image_dir = os.path.join(save_path,'%s_%s.jpg' % (i,save_num))
                cv2.imwrite(save_image_dir,frame)
            n = n + 1
            cv2.waitKey(1)
        cap.release()
        print('讀取第 %s 個(gè)視頻完成 ?。?！' % i)
 
if __name__ == '__main__' :
 
    video_to_image(r'E:\AI\video.mp4', r'E:\AI\video2image')