在Python cv2中保存两个时间戳之间较长的视频剪辑

Question

我有一个一小时长的视频，我想保存两个时间戳之间的剪辑——比如11:20-11:35。逐帧处理的最佳方法是什么，还是有更好的方法?

Answer 1

这是我逐帧所做的要点。如果有更少损耗的方法，我很想知道!我知道我可以使用ffmpeg从终端做到这一点，但我很好奇如何使用cv2最好地做到这一点。

def get_clip(input_filename, output_filename,  start_sec, end_sec):
# input and output videos are probably mp4
vidcap = cv2.VideoCapture(input_filename)

# math to find starting and ending frame number
fps = find_frames_per_second(vidcap)
start_frame = int(start_sec*fps)
end_frame = int(end_sec*fps)
vidcap.set(cv2.CAP_PROP_POS_FRAMES,start_frame)

# open video writer
vidwrite = cv2.VideoWriter(output_filename, cv2.VideoWriter_fourcc(*'MP4V'), fps, get_frame_size(vidcap))

success, image = vidcap.read()
frame_count = start_frame
while success and (frame_count < end_frame):
vidwrite.write(image)  # write frame into video
success, image = vidcap.read()  # read frame from video
frame_count+=1
vidwrite.release()