# v04mw.py
#   ||+------- VideoWriter 使用　
#   |+-------- numpy.maximum 使用
#   +--------- 4フレーム合成

import cv2
import numpy
import sys

if len(sys.argv) != 3:
    print('usage: v03mw Readfilename Writefilename ')
    exit()

path = sys.argv[1]   
cap = cv2.VideoCapture(path)

fps = cap.get(cv2.CAP_PROP_FPS)
print('fps',fps)
w = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
print('w',w)
h = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
print('h',h)
print('FC',cap.get(cv2.CAP_PROP_FRAME_COUNT))

fourcc = cv2.VideoWriter_fourcc('m', 'p', '4', 'v')        
# 動画保存時のfourcc設定（mp4用）
pathw = sys.argv[2] 
out = cv2.VideoWriter( pathw, fourcc, fps, (w, h))  

i=1

ret,img0 = cap.read()
ret,img1 = cap.read()
ret,img2 = cap.read()

while True :
    print("Frame: "+ str(i))
    #フレーム情報取得
    ret, img = cap.read()
    
    #動画が終われば処理終了
    if ret == False:
        break

    img3  = numpy.maximum( img0 ,img1)
    img33 = numpy.maximum( img2, img3)
    img4  = numpy.maximum( img33, img )
#    img3 = cv2.addWeighted(src1=img0,alpha=0.6,src2=img1,beta=0.6,gamma=0)
#    img4 = cv2.addWeighted(src1=img3,alpha=1.0,src2=img,beta=0.6,gamma=0)
    #動画表示
    cv2.imshow('Video0', img0)
    cv2.imshow('Video1', img1)
    cv2.imshow('VideoTemp ', img )
    cv2.imshow('Video0123T', img4)

    out.write(img4)

    i +=1
    img0 = img1.copy()
    img1 = img2.copy()
    img2 = img.copy()

    k = cv2.waitKey(1)&0xff # キー入力を待つ場合は 0
    if k == ord('q'):
        # 「q」キーが押されたら終了する
        break
    
cap.release()
out.release()
cv2.destroyAllWindows()