由于pygame.movie.Movie.play() 只支持MPEG格式的视频,且 pygame版本大于1.9.5好像已经不支持这个模块了,所以决定使用与opencv读取视频帧的画面,利用pygame的surface刷新窗口。
有基础的小伙伴,代码还是很好理解,直接上代码
pygame.time.Clock()同步时间
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import pygame from pygame. locals import * import cv2 import sys import time FPS = 30 FramePerSec = pygame.time.Clock() video_path = './Selected Stimuli/noaudio_c_001_critical_swerve.mp4' video = cv2.VideoCapture(video_path) pygame.init() pygame.display.set_caption( 'OpenCV Video Player on Pygame' ) screen = pygame.display.set_mode(( 1280 , 720 ), 0 , 32 ) screen.fill([ 0 , 0 , 0 ]) num = 0 while True : T1 = time.time() ret, frame = video.read() if ret = = False : print ( 'Total Time:' , time.time() - T0) sys.exit() frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB) frame = cv2.transpose(frame) frame = pygame.surfarray.make_surface(frame) screen.blit(frame, ( 0 , 0 )) if num = = 0 : T0 = time.time() pygame.display.update() FramePerSec.tick(FPS) num + = 1 print ( 'freq time:{}, frame num: {}' . format (time.time() - T1, num)) for event in pygame.event.get(): if event. type = = QUIT: sys.exit() |
但是存在一些问题,时间戳的耗时比视频默认时间更长。
按理说FramePerSec = pygame.time.Clock()是能够很好的控制总的时长,但是发现视频越长播放器的延迟时间越长
换成Ubuntu系统后,发现以上延迟的问题得到缓解,推测可能与Windows系统中的进程管理有关。但是视频时差别很明显,比如120s视频,实际播放时间只用了118.8s。推测可能是pygame.time.Clock()是确保单帧的刷新率与预设相同,但是由于每一帧都存在相同的时间误差,就导致误差累加的问题明显。
自编时间控制
由于以上原因无法解决,增加了一个简单的控制逻辑后可有效控制视频播放的时间戳问题
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import pygame from pygame. locals import * import cv2 import sys import time video_path = 'out1.avi' video = cv2.VideoCapture(video_path) FPS = int ( round (video.get(cv2.CAP_PROP_FPS))) FramePerSec = pygame.time.Clock() Width = int (video.get(cv2.CAP_PROP_FRAME_WIDTH)) Height = int (video.get(cv2.CAP_PROP_FRAME_HEIGHT)) pygame.init() pygame.display.set_caption( 'OpenCV Video Player on Pygame' ) screen = pygame.display.set_mode((Width, Height), 0 , 32 ) screen.fill([ 0 , 0 , 0 ]) num = 0 while True : if num = = 0 : T0 = time.time() if time.time() - T0 > num * ( 1. / FPS): ret, frame = video.read() TimeStamp = video.get(cv2.CAP_PROP_POS_MSEC) if ret = = False : print ( 'Total Time:' , time.time() - T0) pygame.quit() sys.exit() frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB) frame = cv2.transpose(frame) frame = pygame.surfarray.make_surface(frame) screen.blit(frame, ( 0 , 0 )) pygame.display.update() num + = 1 for event in pygame.event.get(): if event. type = = QUIT: sys.exit() |
到此这篇关于pygame+opencv实现读取视频帧的方法示例的文章就介绍到这了,更多相关pygame opencv读取视频帧内容请搜索服务器之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持服务器之家!
原文链接:https://blog.csdn.net/Forrest97/article/details/107799833