MKVExtract GUI is the most convenient MKV extractor that could extract video, audio or subtitles from a MKV video file. This simple guide will help you extract soft subtitles you may need from within an mkv file for editing or other uses.
You have problem with watching some .mkv movies and also you can't add soundtrack to the mkv video. There're certain damaged fragments inside MKV file, which causes video players to stop playback and mkv editor to stop processing the file. You have to fix the mkv files with some mkv repair tool such
MKV (Matroska) video more exactly is about a container, especially for the HD videos. Usually it has a large file, you may need to split the mkv files for saving storage space or discarding the annoying chapters.