Set all language tags to "und"

Help
1

Hi. I’ve got videos which have messed up language tags so when importing to mkvtoolnix I want to set all languages tags to “und”. Is that possible? I searched through Preferences but couldn’t find anything related.

2

Welcome!

There’s currently no such functionality in MKVToolNix GUI.

4

BATCH file:

for %%Z in ("*.mkv") do (echo %%~nxZ
  (mkvpropedit.exe "%%Z" -e track:v1 -s language=UND)
  (mkvpropedit.exe "%%Z" -e track:a1 -s language=UND)
  echo;)

CMD box:

for %Z in ("*.mkv") do (echo %~nxZ
  (mkvpropedit.exe "%Z" -e track:v1 -s language=UND)
  (mkvpropedit.exe "%Z" -e track:a1 -s language=UND)
  echo;)