解决opencv保存视频打不开问题

问题描述

使用opencv来保存录制的视频，但是保存后的视频就是打不开，网上查找了很多资料，后面发现原来是保存的视频尺寸和被录制的视频尺寸不一样造成的，原本的代码如下

import cv2

cap = cv2.VideoCapture(0)
fourcc = cv2.VideoWriter_fourcc(*'mp4v')
videoWrite = cv2.VideoWriter(r'../videos/test.mp4', fourcc, 30, (640, 480))

while cap.isOpened():
    ret, frame = cap.read()
    if not ret:
        break
    videoWrite.write(frame)
    cv2.imshow('frame', frame)

    if cv2.waitKey(33) & 0xFF == ord('q'):
        break
        
videoWrite.release()
cap.release()
cv2.destroyAllWindows()

解决方案

解决方法很简单，统一大小，用代码获取录制视频的宽高即可。

width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))

解决后完整代码如下

import cv2

cap = cv2.VideoCapture(0)
fourcc = cv2.VideoWriter_fourcc(*'mp4v')
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
videoWrite = cv2.VideoWriter(r'../videos/test.mp4', fourcc, 30, (width,height))

while cap.isOpened():
    ret, frame = cap.read()
    if not ret:
        break
    videoWrite.write(frame)
    cv2.imshow('frame', frame)

    if cv2.waitKey(33) & 0xFF == ord('q'):
        break
        
videoWrite.release()
cap.release()
cv2.destroyAllWindows()