Ensure the video and audio tracks you want are checked in the bottom pane. Set Output: Choose where you want the new file to be saved.
This guide explains what an MKV index is, why it breaks, and how to fix it for free. What is an MKV Index? mkv index free
VLC is known for its ability to play broken or incomplete files. If you attempt to seek in an index free file, VLC will often attempt to rebuild the index on the fly or prompt the user to repair the file, though this is a temporary fix for that specific playback session. Ensure the video and audio tracks you want
Look at the bottom of the window and choose your destination. Click the Start multiplexing button. What is an MKV Index
(technically called "Cues"). In an MKV file, the index acts like a map that tells your media player exactly where specific frames are located. Without it, your player has to "guess," leading to laggy seeking or files that won't open at all.
Create a text file, paste the code below, and save it as fix_mkv.bat in your video folder: