python裁切视频后三秒

代码：

import subprocess
from datetime import timedelta
import os

def parse_time(time_str):
    """将时间字符串解析为秒"""
    hours, minutes, seconds = map(int, time_str.split(':'))
    return timedelta(hours=hours, minutes=minutes, seconds=seconds).total_seconds()

def ffmpeg_get_duration(input_path):
    """获取视频的总时长（秒）"""
    result = subprocess.run(['ffprobe', '-v', 'error', '-show_entries', 'format=duration', '-of', 'default=noprint_wrappers=1:nokey=1', input_path], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    duration = float(result.stdout.decode('utf-8').strip())
    return duration

def ffmpeg_trim(input_path, output_path, duration):
    """使用ffmpeg裁剪视频的最后3秒"""
    # 计算裁剪的结束时间（视频时长 - 3秒）
    end_time_sec = duration - 3
    start_time_sec = 0

    cmd = [
        'ffmpeg',
        '-i', input_path,
        '-ss', str(start_time_sec),
        '-to', str(end_time_sec),
        '-c', 'copy',
        output_path
    ]

    try:
        subprocess.run(cmd, check=True)
    except subprocess.CalledProcessError as e:
        print(f"An error occurred while processing the video: {e}")

# 指定包含视频文件的文件夹路径
video_folder_path = r'E:\edge下载\81'

# 遍历文件夹中的所有视频文件
for video_file in os.listdir(video_folder_path):
    if video_file.lower().endswith(('.mp4', '.avi', '.mov', '.mkv')):  # 根据需要添加或删除文件类型
        # 完整的视频文件路径
        video_path = os.path.join(video_folder_path, video_file)
        # 输出文件路径，这里假设输出文件与原文件同名，但放在不同的文件夹中
        output_folder_path = r'E:\edge下载\81_trimmed'
        if not os.path.exists(output_folder_path):
            os.makedirs(output_folder_path)
        output_path = os.path.join(output_folder_path, video_file)

        # 获取视频的总时长
        original_duration = ffmpeg_get_duration(video_path)

        # 调用函数进行时间裁剪
        ffmpeg_trim(video_path, output_path, original_duration)

        print(f"Trimmed the last 3 seconds of {video_file} successfully.")