In recent times the format war of multimedia files has become a colossal fight that day by day has new extensions that compete for the first places in popularity.
One of those extensions is Matroska (MKV) and from it, come applications such as MKVToolnix, which brings the great possibility of working basing the tasks in improving or modifying said format.
To be more specific, MKVToolnix has a series of options that allow for example to paste videos in MKV format, visualise an extract parts of said video.
Also, MKVToolnix has support for the AVI and OGG video formats, so popular in the Streaming video world.
In brief, if you are looking for an application to manage files in MKV format, MKVToolnix is the only option to consider.