buyiyang

回复 6# 877
第23行有个笔误，应该为set "SecondMp4=%CS%"

@echo off
REM 1、下载并安装 FFmpeg 这个命令行工具
REM https://github.com/BtbN/FFmpeg-Builds/releases
REM 2、根据自己电脑实际安装路径设置以下临时环境变量
set "path=C:\Program Files\ffmpeg\ffmpeg-n6.0-latest-win64-gpl-6.0\bin\;%path%"

cd /d "%~dp0"
set "OutputName=output.mp4"
for %%i in (*.wav) do (
    set "InputWav=%%i"
)
for %%i in (*.mp4) do (
    set "InputMp4=%%i"
)

for /f "tokens=2-5 delims=:., " %%a in ('ffmpeg.exe -i "%InputWav%" 2^>^&1 ^| find "Duration:"') do (
    call :Time2SS %%a %%b %%c %%d
)
set "SecondWav=%CS%"
for /f "tokens=2-5 delims=:., " %%a in ('ffmpeg.exe -i "%InputMp4%" 2^>^&1 ^| find "Duration:"') do (
    call :Time2SS %%a %%b %%c %%d
)
set "SecondMp4=%CS%"

set "VideoFactor=%SecondWav%/%SecondMp4%"
set "AudioFactor=%SecondMp4%/%SecondWav%"

ffmpeg.exe -i "%InputMp4%" -vf "setpts=%VideoFactor%*PTS" -af "atempo=%AudioFactor%" "%OutputName%"
goto :eof

:Time2SS
set /a HH=1%1-100,MM=1%2-100,SS=1%3-100
set "CS=(%HH%*3600+%MM%*60+%3.%4)"
goto :eof
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