Rockblackdoll.m4v

If the file is unprotected, it can often be renamed to .mp4 and played on most standard media players without any quality loss.

These files are designed for seamless playback on Apple products like iPhone, iPad, and Apple TV. RockBlackDoll.m4v

Users often find the M4V format confusing due to its similarity to MP4 but restrictive nature on non-Apple devices. If the file is unprotected, it can often be renamed to

“M4V is Apple's version, which adds optional DRM-encryption. So if the video is DRM-protected... it should stay as m4v.” Reddit · r/PleX · 8 years ago If the file is unprotected