How to set Language tag in MP4 file.

[BillOatman 502]

If this is not in the correct place, please move it.

I have a bunch of MP4 container files that display audio info like this in Emby:

Undefined language of the audio.

It's because the file is missing the language tag like this file has:

Does anyone know a free simple tool that runs on Windows that could add this tag without reencoding anything?

Also, same question, but for MKV container files.

Thanks!

[seanbuff 847]

44 minutes ago, BillOatman said:

Does anyone know a free simple tool that runs on Windows that could add this tag without reencoding anything?

For MP4, i use MP4Box (which is available for Windows)

I run a small batch script on my .mp4 files without a language set on the audio stream:

for /R %%f in (*.mp4) do mp4box.exe -lang 2=eng "%%f"
echo completed
pause

For MKV, i use mkvtoolnix and use the included mkvpropedit tool for the same result:

for /R %%f in (*.mkv) do "mkvpropedit" "%%f" --edit track:a1 --set name="" --set flag-default=1 --set language=en
echo completed
pause

 

FYI you'll need to add the tools location to your $PATH env variable, otherwise you'll need to specify full executable path in your script

Edited December 14, 2023 by seanbuff
more info

[js28194 15]

Emby App has a "default language" which I believe will force any media with multiple languages to play the default language.  I checked and it does as does Kodi to force default language to English so you don't have to do the above scripting.

Good script though so no knock on that.

 

Ah nevermind... I see what you are trying to do.  Nevermind.

Edited December 15, 2023 by js28194