Ultra M4V joiner is the best M4V joiner in the market now. It can join M4V video files perfectly. With this M4V joiner, you can join M4V, avi, mpeg, wmv, divx, xvid, vob, mpg, 3gp, flv, rm, mov, mp4, and any other video formats together, you can join multiple video files into one large like AVI, MPEG, WMV, RM, MP4, VCD/SVCD/DVD image files, and then you could burn the images into your VCD/SVCD/DVD disk.
Guide: How to use the M4V Video Joiner to join video files Step 1: 
Free download M4V Joiner and install it on your computer.
Step 2: Click 
Button to select the video files you want to join (highlighted no.1)
Step 3: You can edit the source video files, if you need or just would like.
Click on the source file you want to edit, then click
button (highlighted no.2) to edit the selected file, you can set the start time and the end time, as the following picture :
Step 4: Sepcify the directory for output files by clicking the 'Change...' button, or just use the default directory (Note: after successful join, pls click Open button to find where the file stored, if u try to find the converted file via other way, you may can not see the joined file)
Step 5: Sepcify other settings for advanced user, you can set output quality, frame rate, TV type, Aspect Ratio, Add letterbox and so on.
Step 6: Click
Button to join the m4v video files.
After successful join m4v video files, the joined video files shall be stored in the folder you have previously selected. Download free version
Now convinced? 
Buy full version $25 now.