Hi, as for me, I just know how to convert iTunes M4V video to MP4. To do that, I use DRmare M4V Converter for Mac to convert the iTunes video files. This video converter program can convert iTunes videos in a fast speed with lossless video quality. You can use it to convert iTunes video to plain MP4, MOV and more video formats so that you could watch them on other devices. Hope this tip will help you.