View difference between Paste ID: 3qH3r7Gp and yNmMfMdm

 @echo off
 SetLocal EnableDelayedExpansion
 title %~n0
 
 :: only process these input files
 set supported_formats=avi,bik,flv,m2ts,m4p,m4v,mkv,mov,mp2,mp4,mpg,mpeg,mpe,mpv,mts,qt,swf,wmv,xmf,webm
 
 :: temporary created txt file for concat list
 set filelist=temp_concat.txt
 
 set playsound=true
 
 :: check for input files
 if "%~1"=="" ( echo ERROR: NO INPUT & echo  & pause & goto :eof ) else (
 if "%~2"=="" ( echo ERROR: only ONE input file & pause & goto :eof )
 if NOT "%cd%\"=="%~dp1" cd /d "%~dp1"
 )
 
 :: delete filelist is exists
 if exist %filelist% del %filelist%
 
 :: iterate_files
 FOR %%A IN (%*) DO CALL :LogFile "%%~A"
 if exist %filelist% goto :ffmpeg
 goto :eof
 
 :LogFile
 for %%G in (%supported_formats%) do (
 	if /i %~x1==.%%G (
 		if "!first!"=="" (
 			set "first=%~n1"
 			set "extension=%~x1"
 			if /i !extension!==.mp4 CALL :check_audio_mp4 "%~1"
 		) else (
 			set "last=%~n1"
 		)
 		echo ^file '%~nx1'>>%filelist%
 		goto :eof
 	)
 )
 echo ERROR: %~1 - extension not supported & goto :eof
 
 :: if audio stream is not supported in mp4 container, switch to mov (Quicktime). So far I included conditionals for uncompressed pcm, flac and alac audio.
 :check_audio_mp4
 for /f "tokens=*" %%L in ('ffprobe.exe -hide_banner -show_streams -select_streams a -show_entries stream^=codec_name -loglevel quiet "%~1"') do (
 	echo "%%L"| find /i "codec_name" > nul 2>&1
 	if !ErrorLevel!==0 (
 		for /f "tokens=2 delims==" %%C in ("%%L") do (
 			echo "%%C"| find /i "pcm" && ( set "extension=.mov" & goto :eof)
 			if /i "%%C"=="flac" set "extension=.mov" & goto :eof
 			if /i "%%C"=="alac" set "extension=.mov" & goto :eof
 		)
 	)
 )
 goto :eof
 
 :ffmpeg
 title Concat %first% - %last%  ^>   %first%-%last%_merged%extension%"
 set "output=%first%-%last%_merged%extension%"
 ffmpeg.exe -f concat -safe 0 -i %filelist% -map 0:v -map 0:a? -c copy "%output%"
 if not !errorlevel!==0 CALL :ErrorSubroutine %output%
 del %filelist%
 if defined goterror ( pause & goto :eof)
 if %playsound%==true powershell -c (New-Object Media.SoundPlayer "C:\Windows\Media\tada.wav").PlaySync();
 goto :eof
 
 :: if output file is empty, deletes it. prints some messages. stores goterror var.
 :ErrorSubroutine
 title ERROR ^^! ^^! ^^!
 if "%~z1"=="0" del %1
 CALL :Message "ERROR: FILE OUTPUT FAILED"
 set goterror=true
 echo 
 goto :eof
 
 :: prints simple message
 :Message
 echo.
 echo ----------------------------------
 echo %~1
 if not "%~2"=="" echo %~2
 if not "%~3"=="" echo %~3
 echo ----------------------------------
 goto :eof