The trouble to me is about how to upload M4V videos to Facebook. We know all iTunes M4V videos are combined with fairplay DRM protection, it can be played on Apple devices only. Even you have paid for it, there is no right for you to re-encode or share it to other devices. Now with using DRM Media Converter
, you can get rip of DRM protection and convert videos from M4V to MP4 and multiple compatible formats with zero loss quality. After that, you will be able to play all these videos on any devices freely. CLICK HERE
to learn its detail functions.