Joining Multiple Videos into One Using Mplayer

In order to join multiple video files, into a single video file, you just need to issue following command:

$ mencoder -oac copy -ovc copy -o joined_single_video.avi video1.avi video2.avi video3.avi

Even you can use wild cards (*, ?) too.

$ mencoder -oac copy -ovc copy -o joined_single_video.avi video*.avi

PS. In place of 'avi', you can give whatever file format is available.