What is MKVtools?
MKVtools is an application for Mac OS X used for creating and editing videos MKV. It is an update and more specialized version of the original MKVtools, so if you are familiar with its operation, it should be comfortable using this rebranded version. As its name might imply, MKVtools is a graphical interface for a variety of useful tools for processing video files. MEncoder, Mplayer, and MKVToolnix binaries do most of the work. Limitations on MKVtools capacity ‘are most often due to limitations with these applications.
When you open a video file in MKVtools, you will be presented with a list of video, audio and subtitle tracks contained in the file. Sometimes there will be enough information for you to determine what each track. If not, you can select a video and an audio track (and optionally a subtitle track) to preview the tracks in an mplayer window.
Once you have determined what tracks you are interested, you can convert tracks in MKV video, or you can extract the tracks individually to manipulate in your favorite video application. You can also edit MKV files either splitting or joining videos, or you can add tracks to the video.