2. Capture Video

1) Capture Video

import numpy as np
import cv2

# Video 캡쳐를 위해 VideoCapture() 객체생성
# VideoCapture(0)에서 0은 연결된 카메라의 인수
cap = cv2.VideoCapture(0)

while(True):
    ret, frame = cap.read()

    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    cv2.imshow('frame',gray)
    if cv2.waitKey(5) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

2) Saving Video

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('save_video.mp4',fourcc, 20.0, (800,600))

while(cap.isOpened()):
    ret, frame = cap.read()
    if ret==True:
        frame = cv2.flip(frame,0)

        out.write(frame)

        cv2.imshow('frame',frame)
        if cv2.waitKey(5) & 0xFF == ord('q'):
            break
    else:
        break

cap.release()
out.release()
cv2.destroyAllWindows()

▶ cv2.VideoWriter(outputFile, fourcc, frame, size)

    outputFile   저장될 파일명

    fourcc   Codec정보

    frame   초당 저장될 frame

    size   저장될 사이즈

3) Playing Video

import numpy as np
import cv2

cap = cv2.VideoCapture('video.mp4')

while(cap.isOpened()):
    ret, frame = cap.read()

    cv2.imshow('frame',frame)
    if cv2.waitKey(5) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()