ffmpeg -i broken_video.mkv -c copy -map 0 fixed_video.mkv
Before jumping into the fix, it helps to understand why this happens. Common culprits include: mkv index free
While highly versatile, MKV compatibility varies across different platforms: ffmpeg -i broken_video
MKVToolNix is the most powerful, open-source suite for handling Matroska files. It doesn't just "fix" files; it re-muxes them, creating a brand-new, healthy index in the process. Download and open MKVToolNix GUI . Drag your broken MKV file into the "Source files" window. Click "Start multiplexing" at the bottom. it re-muxes them
It will automatically strip the junk and rebuild the index, saving a repaired version to your desktop. 3. VLC Media Player