一、将视频抽帧成图片

import os
import cv2def decode_video(video_path, save_dir, target_num=None):'''video_path: 待解码的视频save_dir: 抽帧图片的保存文件夹target_num: 抽帧的数量, 为空则解码全部帧, 默认抽全部帧'''if not os.path.exists(save_dir):os.makedirs(save_dir)video = cv2.VideoCapture()if not video.open(video_path):print("can not open the video")exit(1)count = 0index = 0frames_num = video.get(7)# 如果target_num为空就全部抽帧,不为空就抽target_num帧if target_num is None:step = 1print('all frame num is {}, decode all'.format(int(frames_num)))else:step = int(frames_num/target_num)print('all frame num is {}, decode sample num is {}'.format(int(frames_num), int(target_num)))while True:_, frame = video.read()if frame is None:breakif count % step == 0:save_path = "{}/{:>04d}.png".format(save_dir, index)cv2.imwrite(save_path, frame)index += 1count += 1if index == frames_num and target_num is None:# 如果全部抽，抽到所有帧的最后一帧就停止breakelif  index == target_num and target_num is not None: # 如果采样抽，抽到target_num就停止breakelse:passvideo.release()if __name__ == '__main__':video_path = './test.mp4'save_dir_1 = './images_all'save_dir_2 = './images_sample'decode_video(video_path, save_dir_1)decode_video(video_path, save_dir_2, 20)

二、将图片组合成视频

ims_folder：待处理的图片文件夹
video_path：输出视频的路径

import os
from PIL import Image
import cv2if __name__ == '__main__':ims_folder = './frames'video_path = './out_video.mp4'ims_path_list = os.listdir(ims_folder)ims_path_list.sort()fps = 30im_path = os.path.join(ims_folder, ims_path_list[0])im_size = Image.open(os.path.join(ims_folder, ims_path_list[0])).sizefourcc = cv2.VideoWriter_fourcc(*"MJPG")videoWriter = cv2.VideoWriter(video_path, fourcc, fps, im_size)for i, im_path in enumerate(ims_path_list):im_path = os.path.join(ims_folder, im_path)frame = cv2.imread(im_path)videoWriter.write(frame)print(im_path)videoWriter.release()print('finish')

三、图片转成GIF图

ims_folder：待处理的图片文件夹
gif_path：输出GIF图的路径

import os
import imageioif __name__ == '__main__':ims_folder = './frames'gif_path = './episode.gif'ims_path_list = os.listdir(ims_folder)ims_path_list.sort()ims_list = []for i, im_path in enumerate(ims_path_list):im = imageio.imread(os.path.join(ims_folder, im_path))ims_list.append(im)imageio.mimsave(gif_path, ims_list, duration=0.4, loop=1)

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