Tonight I discovered I had an entire folder of dual audio MKV files with the wrong default language and wrong default subtitle track. I could have used mkvpropedit to manually change each file but that’s such a hassle. Instead, here’s a handy one-liner to do them all at once:
find . -name "*.mkv" -exec mkvpropedit {} --edit track:a1 --set flag-default=0 --edit track:a2 --set flag-default=1 --edit track:s1 --set flag-default=0 --edit track:s2 --set flag-default=1 \;
Explanation
At first glance they may look a bit complicated, but let’s break it down a bit:
Find all .mkv files and execute an operation on them:
find . -name "*.mkv" -exec ... \;
Do an mkvpropedit on the current matched file:
mkvpropedit {}
Set the first audio track to not be default, the second audio track to be default, and do the same with the subtitle tracks:
--edit track:a1 --set flag-default=0
--edit track:a2 --set flag-default=1
--edit track:s1 --set flag-default=0
--edit track:s2 --set flag-default=1
You’ll need mkvtoolnix installed for the mkvpropedit command. To determine what the various tracks contain, do a
mkvinfo /path/to/file.mkv
or mkvinfo -g for you GUI users 🙂 This can be a bit tricky to read though so I tend to just open the file in VLC and look at the audio and video tracks that way.
As an added bonus, here’s the Windows equivalent of the above script:
@echo off
FOR /f "tokens=*" %%G IN ('dir /a-d /b') DO (
mkvpropedit.exe "%%G" --edit track:2 --set flag-default=0
mkvpropedit.exe "%%G" --edit track:3 --set flag-default=0
mkvpropedit.exe "%%G" --edit track:4 --set flag-default=1
mkvpropedit.exe "%%G" --edit track:5 --set flag-default=0
echo.
)
pause
I’ve been told the Windows version works but haven’t tested personally.
Happy viewing!