how to compine two videos together

edit

Powerful Video Joiner

Joiner of GiliSoft Video Editor is a professional video file joining tool which join or merge multiple video files into a large one. Users can choose whether to add the fade in/out effect to videos by their own wills. It supports joining the same format video files without encoding SUPER-FAST merge and supports joining different formats of video files and select any format one of the file as the output format, or set a custom output format.

Use MKV Merge, install mkvtoolnix-gui and run "mmg"