Is a video format similar to MP4. The difference between the formats is their developers and protection. Apple company, has developed a format that has provided DRM-lock for M4V. Video files in this format are downloaded from iTunes.
Is a protocol for working with AV. This media container format encapsulates elementary streams. It is used to broadcast HDTV. Exists access to errors when the signal is weak, thereby ensuring better synchronization of the stream. The audio and video data are transmitted in DVB and ATSC formats.