77七

@if(0)==(0) echo off
chcp 65001 >nul
cd /d "%~dp0"
for /d %%d in (*) do (
	pushd "%%d"
	(for /f "delims=" %%j in ('dir /b/a-d/on "*.mp4"^|cscript -nologo -e:jscript "%~f0"') do (
		echo;file %%j
	))>New.txt
	ffmpeg -f concat -safe 0 -i New.txt -vcodec copy -acodec copy "%~dp0%%~nxd.mp4"
	del New.txt
	popd
)
pause & exit
@end
 
var str=WScript.StdIn.ReadAll().split('\n')
str.sort(function(a,b){return a.length - b.length;})
WScript.Echo(str.join('\n'))
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