Import both the CSV and the text file into a free tool like or LibreOffice Calc . Use the VLOOKUP function to merge file paths with metadata. You now have a searchable, sortable, professional-grade index of your entire MKV collection—completely free.

: You cannot skip ahead or rewind; attempting to do so may crash the player or restart the video. Incorrect Duration : The media player may show a total time of or an impossibly long duration. Slow Loading

To make the file playable and seekable, you need to "remux" it to generate a new index.

For those who prefer a scriptable method, is a free, powerful command-line tool. To rebuild an index without re-encoding the video (which preserves 100% of the quality), use this command: ffmpeg -i input.mkv -c copy output.mkv

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.

For advanced users and programmers, is a powerful command-line application that lets you tag and index files in a SQLite database.

Try appending two MP4 files together. It’s a nightmare. You have to rewrite the headers, merge the indexes, and recalculate the duration.

MKV files often contain multiple subtitle tracks and audio languages. The index ensures that when you switch from English to French audio mid-playback, the timing remains perfectly synchronized. The Philosophy of "Free" and Open Source