@echo off
set "ScDir=D:\temp"
set "spt1=#EXTINF:"
set "spt2=,"
cd /d "%ScDir%"
for /f  "delims=" %%a in ('dir /a-d /s /b *.txt') do (
	for /f  "delims=" %%i in ('findstr /n ".*" "%%a"') do (
        set "var=%%i"
        setlocal enabledelayedexpansion
        set var=!var:*:=!
		echo;!var!|findstr "%spt1%">nul 
		if !errorlevel!==0 (
		rem 提取尾部字符串
			call :get_string "!var!" end_str 
			rem 生成新的字符串
			set "var=%spt1%-1 %spt2%!end_str!" 
			echo !var!
		) else if !var!. neq . (echo !var!) else (echo.) 
		endlocal
	)>>"%%a.log"  
	rem 删除move前rem可对源文件进行替换	
	rem move /y "%%a.log" "%%a">nul   
)
pause
exit
rem 获取，后结尾字符串
:get_string 
setlocal
set "name=%~1"
	:lp
	call set "ch=%%name:~%i%,1%%"
	if "%ch%" neq "%spt2%" set /a i-=1&goto :lp
	set /a i+=1	
	call set "name=%%name:~%i%%%"
endlocal&set "%2=%name%"&goto:eof
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sed -i "s/#EXTINF:.*,/#EXTINF:-1 ,/g" 1.txt
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