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python截取视频某一帧
2018年11月27日 22:19:36
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奇技淫巧
Python
### python截取视频某一帧 最近有个需求就是给定一个视频，截取某一特定时间的那帧图片。最后决定使用python＋opencv 环境： - python3（`pip install opencv-python`) 核心代码： ```python def get_frame_from_video(video_name, frame_time, img_dir, img_name): """ get a specific frame of a video by time in milliseconds :param video_name: video name :param frame_time: time of the desired frame :param img_dir: path which use to store output image :param img_name: name of output image :return: None """ vidcap = cv2.VideoCapture(video_name) # Current position of the video file in milliseconds. vidcap.set(cv2.CAP_PROP_POS_MSEC, frame_time - 1) # read(): Grabs, decodes and returns the next video frame success, image = vidcap.read() if not os.path.exists(img_dir): os.makedirs(img_dir) if success: # save frame as JPEG file cv2.imwrite(img_dir + sep + img_name, image) # cv2.imshow("frame%s" % frame_time, image) # cv2.waitKey() ```
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