You may try this video tool

ImTOO Video Editor is a multifunctional video tool, which contains functions of Video Joiner, Video Splitter, and Video Cutter. With Video Editor, you can join multiple video files to one simple file, split one file to several segments, moreover, select and cut your favorite segments in one file super easily, fast, with excellent quality. You may try this video tool, I always use it to convert video and edit video, it supports all video and audio formats including AVI, WMV, MP4, MPEG, FLV, MOV, MKV, VOB, MP3, 3GP, etc. You can also use it to trim, crop, join videos, even add a logo to a video, if you are interested in it, here is a guide about how to download and use it