MKV ToolNix free is the best software for videos related issues

                           

                                                MKV ToolNix Is A Solution For Your Videos Related Issues 

 

to split your files in specific output size, cut any video clip from a video file, sync audio in video properly,aspect ratio,tags in a video , extract & combine audio video or it is matter of combine multiple video into one video  "MKV ToolNix" is the best option

MKVToolNix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows

MKVToolNix GUI

is a Qt GUI for mkvmerge and a successor of mmg.

mkvmerge

merges multimedia streams into a Matroska file.^[16]

mkvinfo

lists all elements contained in a Matroska file.

mkvextract

extracts specific parts from a Matroska file to other formats.

mkvpropedit

allows to analyze and modify some Matroska file properties

MKV ToolNix is free 

                           MKV ToolNix Official Site
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