If you’ve ever tried to skip to the middle of a video file or resume playback from where you left off, you’ve relied on an . In the world of digital video, the Matroska Multimedia Container (MKV) is one of the most versatile and popular formats. However, its flexibility comes with a specific technical requirement: a proper index.
ffmpeg -i input.mkv -c copy -movflags +faststart output_fixed.mkv mkv index
If a file is "unseekable" or "broken," it usually means the index (Cues) is missing or corrupted. How to Fix/Rebuild: MKVToolNix (specifically If you’ve ever tried to skip to the
: Integrated navigation markers that act like a digital DVD menu. you must it.
If the index exists but is corrupt (seeking leads to wrong frames), you must it.