ffmpeg 目录下文件批量按时间掐头去尾

@echo off & setlocal enabledelayedexpansion

rem ===================需手动设置===================
rem 设定片头片尾长度，格式为 HH:mm:ss.fff
set "s1=00:02:50.0"
set "s2=00:02:00.0"
rem ================================================

for /f "tokens=1-4delims=:." %%a in ("%s2%") do (
    set /a "t2=(1%%a %% 100 *3600 + 1%%b %% 100 * 60 + 1%%c %% 100) * 1000 + 1%%d %% 1000"
)

md myvideo 2>nul
for %%i in (*.avi *.mkv *.mp4 *.flv) do (
    for /f "tokens=2-5delims=:., " %%a in ('ffmpeg -i "%%i" 2^>^&1 ^| find "Duration:"') do (
        set /a "t=(1%%a%%100*3600+1%%b%%100*60+1%%c%%100)*1000+1%%d0%%1000,t-=t2,ms=t%%1000,t/=1000"
        set /a h=t/3600,m=t%%3600/60,s=t%%60,h+=100,m+=100,s+=100,ms+=1000
        set "t=!h:~1!:!m:~1!:!s:~1!.!ms:~1!"
        ffmpeg -ss !s1! -to !t! -accurate_seek -i "%%i"  -avoid_negative_ts 1 -threads 1 "myvideo\%%i" -y
    )
)
pause