@echo off
:: 因为下面循环每一轮都改变file_prefix的值，所以用了enabledelayedexpansion
setlocal enabledelayedexpansion

set aaa=%random%
set bbb=%random%
set /a last_index=-1

for %%a in (*.flv) do (
set file_prefix=%%~na
set /a last_index+=1
)

:cutright
if !file_prefix:~-1! neq ^_ (
set file_prefix=!file_prefix:~0,-1!
goto cutright
)

(for /l %%i in (0,1,%last_index%) do @echo file '%file_prefix%%%i.flv') > %aaa%.txt
:: 这里可以加一句pause，用于确认列表文件是否正确，如不正确按Ctrl+C
ffmpeg -f concat -safe 0 -i %aaa%.txt -c copy %bbb%.flv
erase %aaa%.txt
endlocal
echo on
复制代码