1 环境要求

需要在电脑上安装ffmpeg并配置好相应的系统环境变量。

2 使用python调用ffmpeg命令

最近在工作中需要将一个文件夹以及其所有子文件夹下所有的视频都修改其码率和分辨率，并保持原有的目录结构，并显示转换进度，这种东西用python来写再合适不过了。

可以参考以下代码：

# -*- coding: UTF-8 –*-
import os
import subprocess
import datetime
from enum import Enum
from tqdm import tqdm

# 对视频操作的枚举
class FFmpegOperatorEnum(Enum):
    Modify_Video_Resolution = 0
    Modify_Video_BitRate = 1
    Modify_Video_FrameRate = 2


class FFmpegBatchConversionVideo:
    m_TotalConversionFiles = 0
    m_TotalFiles = 0
    m_SupportVideoFormat = ['.mp4','.avi']
    m_FFmpegOperatorEnum = None

    m_Video_Resolution = ''
    m_Video_BitRate = ''
    m_Video_FrameRate = ''

    def __init__(self,videoformat = ['.mp4','.avi'],ffmpegOperatorEnum = FFmpegOperatorEnum.Modify_Video_Resolution):
        self.m_SupportVideoFormat = videoformat
        self.m_FFmpegOperatorEnum = ffmpegOperatorEnum
        pass

    def ConvertBatchVideos(self,inputPath,outputPath):
        if not os.path.isdir(outputPath):
            os.mkdir(outputPath)

        #for files in os.listdir(inputPath):
        for files in tqdm(os.listdir(inputPath)): #增加tqdm进度条
            input_name = os.path.join(inputPath,files)
            output_name = os.path.join(outputPath,files)

            # 如果输入路径为文件
            if os.path.isfile(input_name):
                dirPath = (os.path.abspath(os.path.dirname(output_name)))
                # 如果不存在输出文件夹则创建该文件夹
                if not os.path.isdir(dirPath):
                    os.mkdir(dirPath)
                # 判断输入视频的后缀名是否在支持的列表之中
                #if os.path.split(input_name)[-1].lower() in self.m_SupportVideoFormat:
                if input_name.split('.')[1].lower() in self.m_SupportVideoFormat:
                    # 修改视频分辨率
                    if self.m_FFmpegOperatorEnum == FFmpegOperatorEnum.Modify_Video_Resolution:
                        self.ModifyVideoResolution(input_name,output_name)
                    # 修改视频码率
                    elif self.m_FFmpegOperatorEnum == FFmpegOperatorEnum.Modify_Video_BitRate:
                        self.ModifyVideoBitRate(input_name,output_name)
                    # 修改视频帧率
                    elif self.m_FFmpegOperatorEnum == FFmpegOperatorEnum.Modify_Video_FrameRate:
                        self.ModifyVideoFrameRate(input_name,output_name)
                    else:
                        pass
                self.m_TotalFiles += 1

            # 如果输入路径为文件夹
            else:
                # 如果输出文件夹不存在则创建文件夹
                if not os.path.isdir(output_name):
                    os.mkdir(output_name)
                # 递归
                self.ConvertBatchVideos(input_name,output_name)

    def ModifyVideoResolution(self,videoin,videoout):
        t_ffmpegcmdline = 'ffmpeg -i "{}"  -vf scale={} -threads 4 "{}" -hide_banner'.format(videoin,self.m_Video_Resolution ,videoout)
        returncode = subprocess.call(t_ffmpegcmdline)
        self.m_TotalConversionFiles += 1

    def ModifyVideoBitRate(self,videoin,videoout):
        t_ffmpegcmdline = 'ffmpeg -i "{}"  -b:v {} -threads 4 "{}" -hide_banner'.format(videoin, self.m_Video_BitRate ,videoout)
        returncode = subprocess.call(t_ffmpegcmdline)
        self.m_TotalConversionFiles += 1

    def ModifyVideoFrameRate(self,videoin,videoout):
        t_ffmpegcmdline = 'ffmpeg -r {} -i "{}"  -threads 4 "{}" -hide_banner'.format(self.m_Video_FrameRate,videoin, videoout)
        returncode = subprocess.call(t_ffmpegcmdline)
        self.m_TotalConversionFiles += 1

if __name__ == '__main__':
    inputDir = r'H:\ceshi\input'
    outputDir = r'H:\ceshi\output'

    # 记录转换总时间
    opeartion_start_time = datetime.datetime.now()

    # 批量修改视频帧率
    # ffmpegBatchConversionVideo = FFmpegBatchConversionVideo(['mp4','avi'],ffmpegOperatorEnum=FFmpegOperatorEnum.Modify_Video_FrameRate)
    # ffmpegBatchConversionVideo.m_Video_FrameRate = '60'
    # ffmpegBatchConversionVideo.ConvertBatchVideos(inputDir,outputDir)

    # 批量修改视频码率
    # ffmpegBatchConversionVideo = FFmpegBatchConversionVideo(['mp4','avi'],ffmpegOperatorEnum=FFmpegOperatorEnum.Modify_Video_BitRate)
    # ffmpegBatchConversionVideo.m_Video_BitRate = '10000k'
    # ffmpegBatchConversionVideo.ConvertBatchVideos(inputDir,outputDir)

    # 批量修改视频分辨率
    ffmpegBatchConversionVideo = FFmpegBatchConversionVideo(['mp4','avi'],ffmpegOperatorEnum=FFmpegOperatorEnum.Modify_Video_Resolution)
    ffmpegBatchConversionVideo.m_Video_Resolution = '64:64'
    ffmpegBatchConversionVideo.ConvertBatchVideos(inputDir,outputDir)

    opeartion_end_time = datetime.datetime.now()
    opeartion_duration = opeartion_end_time - opeartion_start_time

    print('转换完成，共有视频文件{}个，转换视频文件{}个，共耗时{}'.format(ffmpegBatchConversionVideo.m_TotalFiles,ffmpegBatchConversionVideo.m_TotalConversionFiles,opeartion_duration))

这个脚本算是批量转换的一个原型，可以通过扩展其他的ffmpeg命令批量处理某个文件夹下的所有视频。