MKVToolnix allows you to create, alter, inspect, and more video files with the MKV format. Also available for 64-Bit.

You can use MKVToolNix to create, split, edit, mux, demux, merge, extract, or inspect Matroska files.

MKVToolnix program will also work with other video formats including AVI, MPEG, MP4, MPEG, MPEG1/2, h264, and more as well as some video codecs such as VP9, audio including AAC, FLAC, MP2, MP3, AC3, DTS/DTS-HD, Vorbis and most subtitle formats including SRT, PGS/SUP, VobSub, ASS, and SSA.