以下是几种获取视频时长的实现方法：

方法一：使用moviepy库

from moviepy.editor import VideoFileClip
 
def get_video_duration(file_path):
    video = VideoFileClip(file_path)
    duration = video.duration
    video.close()
    return duration

方法二：使用cv2库

import cv2
 
def get_video_duration(file_path):
    video = cv2.VideoCapture(file_path)
    frame_count = int(video.get(cv2.CAP_PROP_FRAME_COUNT))
    fps = video.get(cv2.CAP_PROP_FPS)
    duration = frame_count / fps
    video.release()
    return duration

方法三：使用ffprobe命令行工具

import subprocess
 
def get_video_duration(file_path):
    result = subprocess.run(['ffprobe', '-v', 'error', '-show_entries', 'format=duration', '-of', 'default=noprint_wrappers=1:nokey=1', file_path], capture_output=True, text=True)
    duration = float(result.stdout)
    return duration