BlackBerry is a range of mobile devices created by Research In Motion. Primarily popular with businesses, the devices were initially launched in 1999 and functionality focused on the needs of a business, with email functionality the key selling point. With the advent of smartphones, specifically the iPhone, RIM attempted to improve functionality offering playback of multimedia through models including the Torch, Curve and Bold. The company has enjoyed limited success and struggled to regain any further market share from Samsung and Apple.
Blackberry supports video playback in a number of formats including 3GP, ASF, AVI, MOV, MP4 and WMV. Blackberry recommends the use of MP4 for video playback using the Advanced Audio Coding audio codec on all of the Blackberry Smartphone devices. Newer devices support high definition video at a resolution up to 800x480 pixels, with a maximum pixel density found on the Blackberry Bold and Porsche at 287PPI featuring 720p.
The M4V file format was developed by Apple. It is very similar to the MP4 file type, with the main difference being that M4V may contain Apple's DRM protection, Fairplay. Video content downloaded from the iTunes store is likely to be in M4V format. If M4V file does have DRM enabled then the iTunes account used to procure the file will need to be authenticated on the computer playing the file.
The M4V file is a container that allows audio and video. In certain circumstances where Apple's DRM has not be applied to the file, it is possible to play the file from a different unauthenticated computer by amending the file extension from .m4v to .mp4. Additionally m4v provides the functionality to create chapter information which is not possible with MP4.
Apple QuickTime Player Apple iTunes VLC Media Player