Python实现视频分帧的方法分享
作者:像风一样的男人@
这篇文章主要为大家详细介绍了如何通过Python语言实现视频分帧的功能,文中的示例代码讲解详细,感兴趣的小伙伴可以跟随小编一起尝试一下
下载依赖
pip install opencv-python==4.0.0.21
实现
方法一
def video_to_frames(video_path, outPutDirName): """ 抽取视频帧存为图片 :param video_path: :param outPutDirName: :return: """ times = 0 # 提取视频的频率,每1帧提取一个 frame_frequency = 1 # 如果文件目录不存在则创建目录 if not os.path.exists(outPutDirName): os.makedirs(outPutDirName) # 读取视频帧 camera = cv2.VideoCapture(video_path) while True: times = times + 1 res, image = camera.read() if not res: print('not res , not image') break # 按照设置间隔存储视频帧 if times % frame_frequency == 0: create_path = os.path.join(outPutDirName, f"{str(times)}.jpg") cv2.imwrite(create_path, image) logger.info('图片提取结束') # 释放摄像头设备 camera.release() def image_to_video(image_path, media_path, fps): ''' 图片合成视频函数 :param image_path: 图片路径 :param media_path: 合成视频保存路径 :return: ''' # 获取图片路径下面的所有图片名称 image_names = os.listdir(image_path) # 对提取到的图片名称进行排序 image_names.sort(key=lambda n: int(n[:-4])) # 设置写入格式 fourcc = cv2.VideoWriter_fourcc('M', 'P', '4', 'V') # 设置每秒帧数 fps = fps # 读取第一个图片获取大小尺寸,因为需要转换成视频的图片大小尺寸是一样的 image = Image.open(os.path.join(image_path, image_names[0])) # 初始化媒体写入对象 media_writer = cv2.VideoWriter(media_path, fourcc, fps, image.size) # 遍历图片,将每张图片加入视频当中 for image_name in image_names: im = cv2.imread(os.path.join(image_path, image_name)) media_writer.write(im) # 释放媒体写入对象 media_writer.release() logger.info('无声视频写入完成!')
方法二
import numpy as np import cv2 import os import sys def cut(video_file, target_dir): cap = cv2.VideoCapture(video_file) # 获取到一个视频 isOpened = cap.isOpened # 判断是否打开 # 为单张视频,以视频名称所谓文件名,创建文件夹 temp = os.path.split(video_file)[-1] dir_name = temp.split('.')[0] single_pic_store_dir = os.path.join(target_dir, dir_name) if not os.path.exists(single_pic_store_dir): os.mkdir(single_pic_store_dir) i = 0 while isOpened: i += 1 (flag, frame) = cap.read() # 读取一张图像 fileName = 'image' + str(i) + ".jpg" if (flag == True): # 以下三行 进行 旋转 #frame = np.rot90(frame, -1) #print(fileName) # 设置保存路径 save_path = os.path.join(single_pic_store_dir, fileName) #print(save_path) res = cv2.imwrite(save_path, frame, [cv2.IMWRITE_JPEG_QUALITY, 70]) #print(res) else: break return single_pic_store_dir if __name__ == '__main__': video_file = 'I:/crack.avi' cut(video_file, 'I:/data/')
方法三
#!/usr/bin/env python import cv2 numer = 18 cap=cv2.VideoCapture("/home/linux/work/python/video/"+str(numer)+".mp4") if cap.isOpened(): ret,frame=cap.read() else: ret = False n=0 i=0 timeF = 40 path='/home/linux/work/python/video/'+str(numer)+'/{}' while ret: n = n + 1 ret,frame=cap.read() if (n%timeF == 0) : i = i+1 print(i) filename=str(numer)+"_"+str(i)+".jpg" cv2.imwrite(path.format(filename),frame) cv2.waitKey(1) cap.release()
补充
除了视频分帧,Python还可以将帧合成视频流,下面是实现代码
#!/usr/bin/env python import cv2 img = cv2.imread('/home/linux/work/python/img/1_475.jpg') imginfo = img.shape size = (imginfo[1],imginfo[0]) print(size) fourcc = cv2.VideoWriter_fourcc(*"mp4v") videoWrite = cv2.VideoWriter('/home/linux/work/python/2.mp4',fourcc,10,size) for i in range(475,2208): filename = '/home/linux/work/python/img/1_'+str(i)+'.jpg' img = cv2.imread(filename,1) videoWrite.write(img) print(i) videoWrite.release() print('end')
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