MKVToolnix is a video editing and conversion tool for the Matroska format, commonly referred to as ‘MKV’ by most users. Media conversions are possible in a wide range of formats, including video, audio, and subtitles. 

As a result, we can import any file format, including Avi, Wmv, Ogg, Srt, Mp3, Mp4, Rmv, and Usf, into our projects.

This means that for our conversions and editions, we will use both images, which will serve as the primary tool, and audio or subtitle files, which can be easily added to the final product.

MKVToolnix is a tool for advanced video editors and converters, as its vast number of options, while not especially complex, can be overwhelming to some users.