1.主要用途： 获取目标检测数据集时，录像获取视频，然后播放该视频并截取其图像；
2.运行方法： 在安装好依赖包后，更换成自己的视频文件路径，运行main程序即可；
3.播放后使用说明： 运行播放后，按下q键退出，s键保存当前帧图片；按k可暂停视频,再按s保存该帧图像；
说明一：.亲测在Ubuntu系统下，MP4格式文件的截取；
说明二： 保存图像的路径在当前目录会自动生成一个文件夹进行保存；不清楚的可以先运行该程序，按s保存即清除保存路径
说明三： rotate代表是否对原视频进行旋转
若有什么问题，欢迎留言交流。。
import cv2
from pathlib import Path
import glob, re ,os
import imutils
def increment_path(path, exist_ok=False, sep='', mkdir=False):
# Increment file or directory path,
path = Path(path) # os-agnostic
n = ''
if path.exists() and not exist_ok:
suffix = path.suffix
path = path.with_suffix('')
dirs = glob.glob(f"{
path}{
sep}*") # similar paths
matches = [re.search(rf"%s{
sep}(\d+)" % path.stem, d) for d in dirs]
i = [int(m.groups()[0]) for m in matches if m] # indices
n = max(i) + 1 if i else 2 # increment number
path = Path(f"{
path}{
sep}{
n}{
suffix}") # update path
dir = path if path.suffix == '' else path.parent # directory
if not dir.exists() and mkdir:
dir.mkdir(parents=True, exist_ok=True) # make directory
return path, str(n)
#====== init pic save path=======#
# 1. process the input video name
def init_savepath(video_path=None):
assert video_path is not None, 'please check the video path'
v_path = video_path
inp_videoname = os.path.split(v_path)[-1] # 得到输入视频的名字，如video.mp4
videoname, video_type = inp_videoname.split('.') # return str
# 2. init the cutpic save dir
project_name = f'save_dir/video_cutpic/' # parents savedir , eg. save_dir/video_cutpic
childdir_savename = f'{
videoname}_dir' # child_savedir name ,eg video3_dir
exist_ok = False
save_dir, savedir_num = increment_path(Path(project_name) / childdir_savename, exist_ok=exist_ok) # return type :str
Path(str(save_dir)).mkdir(parents= True, exist_ok=True)
return v_path, save_dir, childdir_savename, savedir_num
#================================#
def videocut_process(ori_videopath=None, rotate =False, angle=None):
assert ori_videopath is not None, 'please check the video path'
print(' k to pause the video, q to quit the process')
video_path, save_dir, childdir_savename, savedir_num = init_savepath(video_path=ori_videopath)
pic_startnum = 0
cap = cv2.VideoCapture(video_path)
fps = cap.get(cv2.CAP_PROP_FPS) # 原视频的fps
while (cap.isOpened()):
ret, frame = cap.read()
if ret:
height, width = frame.shape[:2]
if rotate:
frame = imutils.rotate_bound(frame, angle)
cv2.imshow('frame', frame)
k = cv2.waitKey(1)
filename = str(Path(save_dir) / f'{
childdir_savename}{
savedir_num}_{
pic_startnum}.jpg') # savefilename
if k == ord('q'): # 按q键退出
break
elif k == ord('s'): # 保存当前帧图片
cv2.imwrite(filename, frame)
print(f'Save pic{
pic_startnum} success')
pic_startnum +=1
elif k == ord('k'): # 点击k暂停，
print('pause now, press k to continue, press s to save the pic')
k2 = cv2.waitKey(0)
if k2 ==ord('s'):
cv2.imwrite(filename, frame)
print(f'Save pic{
pic_startnum} success')
pic_startnum +=1
else:
cap.release()
cv2.destroyAllWindows()
break
# 需要的文件， 1. 视频文件.mp4 2.保存的路径
# 保存文件 使用Increment进行保存
if __name__ == '__main__':
video_path = 'video2.mp4'
rotate_bool, angle_val = True, -90 # 是否旋转，旋转角度
videocut_process(ori_videopath=video_path, rotate=rotate_bool, angle=angle_val)