python获取视频时长方法

1.使用subprocess和re

import re
import subprocess
video = r"work/train/video/a8b96f016a28d8f3836f7cbb7734ecde.mp4"
import subprocess

def get_length(filename):
    result = subprocess.run(["ffprobe", "-v", "error", "-show_entries",
                             "format=duration", "-of",
                             "default=noprint_wrappers=1:nokey=1", filename],
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT)
    return float(result.stdout)
t=get_length(video)
print(t)

运行结果：

2.使用VideoFileClip

from moviepy.editor import VideoFileClip
clip=VideoFileClip(video)
print(clip.duration)

运行结果：

3.使用cv2

import cv2
def get_video_duration(filename):
  cap = cv2.VideoCapture(filename)
  if cap.isOpened():
    rate = cap.get(5)
    frame_num =cap.get(7)
    duration = frame_num/rate
    return duration
  return -1
t=get_video_duration(video)
print(t)

运行结果：

从结果可以看出，cv2的运行时长是最短的，推荐使用cv2