Official BS.Player forums

Did you allow BS.Player (upon its installation) to download and locally (i.e. for BS.Player's use only) install its preferred filters/codecs?
Wikipedia:

Quote:

The copyright of M4V files may be protected by using Apple's FairPlay DRM copyright protection. To play a protected M4V file, the computer needs to be authorized (using iTunes) with the account that was used to purchase the video. However, unprotected M4V files may be recognized and played by other video players by changing the file extension from ‘.m4v’ to ‘.mp4’.

:wink:
P.S.:
I think m4v should be decoded by http://www.free-codecs.com/FFDShow_download.htm