opencv-保存视频操作

#代码完成的功能：对已存在的视频进行处理之后进行保存



import cv2

video = cv2.VideoCapture("v_CricketShot_g04_c01.avi")  # 打开视频

fourcc = cv2.VideoWriter_fourcc(*'MP4V')  # 视频编解码器
fps = video.get(cv2.CAP_PROP_FPS)  # 帧数
width, height = int(video.get(cv2.CAP_PROP_FRAME_WIDTH)), int(video.get(cv2.CAP_PROP_FRAME_HEIGHT))  # 宽高
out = cv2.VideoWriter('save_opening.avi', fourcc, fps, (width, height))  # 写入视频

bs = cv2.createBackgroundSubtractorKNN(detectShadows=True)
es = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (3, 3))

while video.isOpened():
    ret, frame = video.read()
    if ret == True:
        gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
        #gray = cv2.cvtColor(gray, cv2.COLOR_GRAY2RGB)
        fgmask = bs.apply(gray)
        KNN_medianBlur = cv2.medianBlur(fgmask, 5)  # 中值滤波
        kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (4, 4))  # 创建矩形结构单元
        opening = cv2.morphologyEx(KNN_medianBlur, cv2.MORPH_OPEN, kernel)  # 形态学处理,开运算
        opening = cv2.cvtColor(opening, cv2.COLOR_GRAY2RGB)#不加这一句会报错，因为这一句导致了一天的bug
        out.write(opening)  # 写入帧
        cv2.imshow('opening', opening)
        if cv2.waitKey(1) & 0xFF == ord('q'):  # q退出
            break
    else:
        break

video.release()
out.release()
cv2.destroyAllWindows()

#保存视频通用操作


import cv2

video = cv2.VideoCapture("v_CricketShot_g04_c01.avi")  # 打开视频

fourcc = cv2.VideoWriter_fourcc(*'MP4V')  # 视频编解码器
fps = video.get(cv2.CAP_PROP_FPS)  # 帧数
width, height = int(video.get(cv2.CAP_PROP_FRAME_WIDTH)), int(video.get(cv2.CAP_PROP_FRAME_HEIGHT))  # 宽高
out = cv2.VideoWriter('save_video.avi', fourcc, fps, (width, height))  # 写入视频


while video.isOpened():
    ret, frame = video.read()
    if ret == True:
        out.write(frame)  # 写入帧
        cv2.imshow('frame', frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):  # q退出
            break
    else:
        break

video.release()
out.release()
cv2.destroyAllWindows()