在Python cv2中将长视频剪辑保存在两个时间戳之间

Question

我有一个小时长的视频，我想保存一个夹在两个时间戳之间--比如说，11:20-11:35。这是一帧一帧的最佳方式，还是有更好的方法？

Answer 1

这是我一片狼藉所做的事情的要点。如果有更少的方法做这件事，我很想知道！我知道我可以在终端上使用ffmpeg完成它，但是我很好奇如何最好地使用cv2来完成它。

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()