ubuntu下攝像頭錄製花屏

隨手記，在win10下用攝像頭錄製視頻沒問題，把代碼直接複製帶ubutnu下，一直花屏，試了很多，最後發現是少了一句

cap.set(6,cv2.VideoWriter_fourcc('M', 'J', 'P', 'G') )

下面貼全部代碼

import cv2
import time
timenow = time.strftime('%Y%m%d_%H%M%S')


def get_time_stamp():
    ct = time.time()
    local_time = time.localtime(ct)
    data_head = time.strftime("%H:%M:%S", local_time)
    data_secs = (ct - int(ct)) * 1000
    time_stamp = "%s.%03d" % (data_head, data_secs)
    return time_stamp


def videowork():
    videoname = 'data_0527/' + time.strftime('%Y%m%d_%H%M%S') + '.avi'
    fourcc = cv2.VideoWriter_fourcc('M', 'J', 'P', 'G')
    cap = cv2.VideoCapture(0)
    cap.set(3,1920)
    cap.set(4,960)
    cap.set(5,25)
    cap.set(6,cv2.VideoWriter_fourcc('M', 'J', 'P', 'G') )
    out = cv2.VideoWriter(videoname, fourcc, 25, (1920, 960))
    time.sleep(1)
    aaaa = 0
    cc = 0
    t0=time.clock()
    while aaaa<300000:
        cc += 1
        t2 = time.clock()
        if t2 - t0 > 1:
            t0 = time.clock()
            print(cc)
            cc = 0
        aaaa += 1
        ret, frame = cap.read()  # get frame
        font = cv2.FONT_HERSHEY_SIMPLEX  # 使用默認字體
        time_temp = get_time_stamp()
        #print('video' + str(time_temp), aaaa)
        frame = cv2.putText(frame, time_temp, (100, 850), font, 2, (0, 0, 255), 3)
        cv2.namedWindow('video', cv2.WINDOW_NORMAL)
        cv2.imshow("video", frame)
        cv2.waitKey(1)
        out.write(frame)

    else:
        cap.release()

while 1:
    videowork()