False. All the tools mentioned above support 10-bit HEVC, HDR10+, and Dolby Vision MKV files. The index reads metadata; it doesn't transcode video.
In the Profile dropdown, choose or keep it as an MKV profile if available.
MKV files are powerful containers that hold video, audio, and subtitles in one place. However, when an MKV file has a broken or missing index, you’ll often find you can't seek through the video, or the file might not play at all. If you are looking for an solution to repair these files, there are several open-source and free tools designed specifically for this purpose. Why MKV Files Lose Their Index mkv index free
The format's versatility comes from its ability to hold an unlimited number of data tracks in one file Multi-Track Support
is a tiny, open-source tool specifically designed for one thing: repairing corrupted MKV headers and indexes. It is particularly effective for files that were cut off during a download or a recording crash. How to use it: Download and unzip the Meteorite.exe In the Profile dropdown, choose or keep it
How to do it with MKVToolNix:
For advanced users or automated workflows, FFmpeg can fix index-free files via the command line instantly without re-encoding. If you are looking for an solution to
By re-muxing the file, you are effectively "repairing" or rebuilding its index. This is the most reliable and thorough method.
Try appending two MP4 files together. It’s a nightmare. You have to rewrite the headers, merge the indexes, and recalculate the duration.
FFmpeg , the powerhouse behind almost every video tool, can also be used to repair indexes. Its advantage is that it's scriptable and available on virtually every platform.
For users who prefer a lightweight command-line interface or need to batch-fix multiple broken files at once, FFmpeg is an incredibly powerful, free solution. Like MKVToolNix, it repairs the file losslessly. The Command Line Process