Is a format established by Japanese companies in 2006. Designed for storage of video in resolution HD. The basis of lay encryption algorithm MPEG-2. Today, there are two HD-resolution videos: 1080p and 720p. This format is positioned as a direct alternative to obsolete DV in the home video recording sphere.
this is a lossless-format (and encoding algorithm) for Apple platforms. M4A is widely used in iPod players and as a component in QuickTime media-players. The m4a codecs decoder is found in open sources - this allows third party users to open files in that format.