ffmpeg IF .bat condition on channel count and language

[geextah_2]

Hi I have a .bat file to convert and change channel volume levels (with ffmpeg) from 5.1 Audio to Stereo, and a different .bat for Stereo/Mono Audio that doesn't change loudness.
Now I have to manually look if a movie is 5.1 or Mono/Stereo and decide which .bat to run. I would like to make one .bat with a condition so it looks what the channel layout for a specific language is and then decide which profile to run. I hope this makes sense. It has to check also the language tag, because sometimes (in my case) german is 2.0 but English is 5.1 or vice versa.

From my understanding I would need ffprobe which gives me the channel count and language for every audio track

ffprobe -i %~1 -v error -select_streams a -of csv=p=0 -show_entries stream=channels,index:stream_tags=language

So I have kinda all the pieces but I don't know how to put them together in a .bat script

Thank you for any advice

Profile A: 5.1

ffmpeg ^
	-i "%~1" ^
	-af "pan=stereo|c0=c2+0.6*c0+0.6*c4+c3|c1=c2+0.6*c1+0.6*c5+c3" -map 0:v:0 -c:v copy -map 0:a:m:language:ger -codec:a ac3 -b:a 160k -ar 44100 -sn -dn ^
	"G:\%~n1.mkv"

Profile B: Stereo/Mono

ffmpeg ^
	-i "%~1" ^
	-map 0:v:0 -c:v copy -map 0:a:m:language:ger -codec:a ac3 -b:a 160k -ar 44100 -sn -dn ^
	"G:\%~n1.mkv"

This is the whole .bat

@echo off
:again

ffmpeg ^
	-i "%~1" ^
	-map 0:v:0 -c:v copy -map 0:a:m:language:ger -codec:a ac3 -b:a 160k -ar 44100 -sn -dn ^
	"G:\%~n1.mkv"
if NOT ["%errorlevel%"]==["0"] goto:error
echo %~n1 Done!

shift
if "%~1" == "" goto:end
goto:again

:error

echo There was an error. Please check your input file or report an issue on github.com/L0Lock/FFmpeg-bat-collection/issues.
pause
exit 0

:end

cls
echo Encoding succesful. This window will close after 10 seconds.
timeout /t 1

[pcspeak]

Hi.
I'ts been a while since I saw someone else using esc codes to change screen colours.
I occasionally use them myself.

I created a multi audio, multi subtitle MKV from a DVD using MakeMKV.exe (movie - The Fifth Element)

The following batch file has a line listing all the audio tracks found.
I left it in to help diagnose any problems. (Where I say tags, read it as parameters or arguments, as you wish.)

The batch file is written assuming all the tags in your videos are as listed and you are consistent with your conversions.
i.e. A missing language tag will mean the tag for the channel count moves from %%i to %%h.
(There are probably a better ways of getting and setting the variables %lang% and %channels%.)

My batch file is:
the 4th tag is the language (%%d). This should be consistent across all MKVs
the 9th tag is the channel count (%%i). This is a tag that showed as the 10th tag (%%j) on other MKVs I have.

All ffmpeg executables are echoed, and NOT run. Change when you're happy.

To_Stereo v01.cmd

@echo off
:loop
ffmpeg.exe -i "%~1" -y nul 2>&1 | find /i "stream" | find "Audio" > "%~n1.txt"

:: List all audio tracks, with tags. To use parentheses as delimiters, the order of the delimiters is important.
echo These audio tracks were found.
for /f "usebackq tokens=1-12 delims=,^:^#() " %%a in ("%~n1.txt") do echo A-%%a B-%%b C-%%c D-%%d E-%%e F-%%f G-%%g H-%%h I-%%i J-%%j K-%%k L-%%l
echo.
for /f "usebackq tokens=1-12 delims=,^:^#() " %%a in ("%~n1.txt") do set lang=%%d&& set channels=%%i&& call :channelcount

shift
if "%~1" neq "" goto :loop
goto :end

:channelcount
if %channels% equ mono call :1channel "%~1"
if %channels% equ 5.1  call :6channel "%~1"
goto :eof

:1channel
echo Process mono
echo ffmpeg -i "%~1" ^
    -map 0:v:0 -c:v copy -map 0:a:m:language:%lang% -codec:a ac3 -b:a 160k -ar 44100 -sn -dn ^
    "G:\%~n1.mkv"
goto :eof

:6channel
echo Process 5.1
echo ffmpeg -i "%~1" ^
    -af "pan=stereo|c0=c2+0.6*c0+0.6*c4+c3|c1=c2+0.6*c1+0.6*c5+c3" -map 0:v:0 -c:v copy -map 0:a:m:language:%lang% -codec:a ac3 -b:a 160k -ar 44100 -sn -dn ^
    "G:\%~n1.mkv"
goto :eof

:end
::del "*.txt"
pause

Cheers.

[hello_hello]

-map 0:v:0 -c:v copy -map 0:a:m:language:ger -codec:a ac3 -b:a 160k -ar 44100 -sn -dn ^

Just out of curiosity... I assume the audio is 48kHz. Why resample it at 44.1kHz?

[geextah_2]

@pcspeak thank you for your reply. I will test this and give you feedback. It looks aswesome
I don't know what "using esc codes to change screen colours" means. all the credit goes to the author from github (github.com/L0Lock/FFmpeg-bat-collection) I just found his .bat scripts and started to build in my own commands ^^

@hello_hello you are right all the audio is usually 48k but my tv (usb) has real problems, and often glitches the video and audio streams so I started to make the audio as small as possible