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 media format designed for creating good quality video with resolution of 352x240 on 1.5 Mb/s flow. Now the standard MPEG-1, which belongs to the format supports a resolution of 4K. Resolution mpg is different from the rest of the MPG format family due to its maximum compatibility: files can be run on any PC or DVD-player.