opencv python播放视频和保存视频

最新推荐文章于 2025-10-07 20:13:51 发布

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本文介绍如何利用OpenCV库在Python中实现视频的播放和保存功能。文章详细展示了通过cv2.VideoCapture读取视频文件，获取视频帧数、宽度、高度等属性，并实时显示视频画面的过程。同时，还讲解了如何将视频帧翻转并保存为新的视频文件，包括设置输出格式、帧率及尺寸等关键步骤。

# -*- coding: utf-8 -*-

import numpy as np
import cv2

def playVideo(videoFile):
	cap = cv2.VideoCapture(videoFile)
	if cap.isOpened():
		print("Open ", videoFile, " success!")
	else:
		print("Open ", videoFile, " failed!")
		return
	#print(cap) # print cap address
	
	# cap.get(propId) 来获得视频的一些参数信息
	print("fps: ", cap.get(cv2.CAP_PROP_FPS))
	print("frame counts: ", cap.get(cv2.CAP_PROP_FRAME_COUNT))
	print("frame width: ", cap.get(cv2.CAP_PROP_FRAME_WIDTH))
	print("frame hight: ", cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
	
	#  cap.set(propId,value) 来修改
	
	while True:
		# Capture frame-by-frame
		ret, frame = cap.read()
		
		# cap.read() get a frame, if ret = false then frame is empty
		if not ret:
			break
		
		# Our operations on the frame come here
		gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
		
		# Display the resulting frame
		cv2.imshow(videoFile, frame)
		cv2.imshow('frame',gray)
		
        # q or ESC to exit
		if cv2.waitKey(1) & 0xFF == ord('q') or cv2.waitKey(1) & 0xFF == 27:
			break;
	
	# When everything done, release the capture
	cap.release()
	cv2.destroyAllWindows()

# 确保已经装了合适版本的 ffmpeg 或者 gstreamer
def saveVideo(videoFile):
	cap = cv2.VideoCapture(videoFile)
	if cap.isOpened():
		print("Open ", videoFile, " success!")
	else:
		print("Open ", videoFile, " failed!")
		return
	#print(cap) # print cap address

	width = cap.get(cv2.CAP_PROP_FRAME_WIDTH)
	height = cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
	# cap.get(propId) 来获得视频的一些参数信息
	print("fps: ", cap.get(cv2.CAP_PROP_FPS))
	print("frame counts: ", cap.get(cv2.CAP_PROP_FRAME_COUNT))
	print("frame width: ", width)
	print("frame hight: ", height)
	
	#  cap.set(propId,value) 来修改
	
	# Define the codec and create VideoWriter object
	# fourcc = cv2.VideoWriter_fourcc(*'XVID')
	fourcc = cv2.VideoWriter_fourcc(*'DIVX')
	out = cv2.VideoWriter('output.avi', fourcc, 20.0, (int(width),int(height)))
	if out.isOpened():
		print("Create output video success!")
	else:
		print("Create output video failed!")
	
	while cap.isOpened():
		# Capture frame-by-frame
		ret, frame = cap.read()
		
		# cap.read() get a frame, if ret = false then frame is empty
		if not ret:
			break
		
		# 上下翻转
		# frame = cv2.flip(frame,0)
		
		# 左右翻转
		frame = cv2.flip(frame,1)
		
		# write the flipped frame
		out.write(frame)
		
		cv2.imshow("frame", frame)
		if cv2.waitKey(1) & 0xFF == ord('q'):
			break;
	
	# When everything done, release the capture
	cap.release()
	out.release()
	cv2.destroyAllWindows()
	
def main():
	#videoFile = 0
	#videoFile = "F:\\dataSet\\video.avi"
	videoFile = "F:\\dataSet\\opencv33.mp4"
	#playVideo(videoFile)
	saveVideo(videoFile)

if __name__ == '__main__':
	main()