MKV. Format (Container format) for video files and the keep track of an unlimited number of video, audio and subtitles in one file is a Matroska. If you wish to keep track of video, audio and subtitles in one MKV file format, remove or add to it, or even ask for a new file based on the Matroska format video files to mp4, avi, … or subtitles srt . And sub. Etc., you can use the MKVToolnix use. With this software you can have the SRT subtitle file format and want to merge MKV format videos easily and when handling or playing movies on the video broadcast. This software has a lot of speed and combined operations without compromising the quality of the movie.