M4V is a video file format that has been downloaded from the Apple iTunes store. The format contains TV shows, videos, films, music. It looks like a .MP4 file, but it sometimes has copy protection when Apple's FairPlay DRM is used (technical copyright protection). The M4V format, i.e., MPEG-4 iTunes Video File, was developed by Apple. MP4 is a container format. Like the same formats as MOV, AVI, MKV, it provides the ability to combine a variety of multimedia streams into one file. Mostly it is audio and video. In order to play the protected M4V file, the computer must be authorized using the iTunes account from which the videos were purchased. In this case, it can be used in order to buy video. Unprotected M4V files can be played by other video players if the extension is changed from .M4v to .Mp4. Files with the M4V extension contain both sound and video data. You can convert M4V files to MP4 format. In this case, it will be possible to play them on other computers, since the M4V files are protected by DRM. MP4 files, compared to the M4V format, do not allow you to specify partition information.
MTS is a video file format needed to play high resolution videos. Such files require AVCHD technology. This format supports 720p resolution and 1080i resolution. Files with the MTS extension are opened using applications installed on Panasonic and Sony high-resolution camcorders. Company data and developed this format. They are the holders of a general patent for the use of the extension. Appliances from Canon and Hitachi also apply this format. MTS is a type of video file that is popular. He found application in the Blu-ray Disc MPEG-2 Transport System. This is an advanced version of the MPEG-2 Transport Stream format for DVDs, Blu-Ray discs, solid state drives or hard drives. Currently used in most modern camcorders. It will not be a mistake to say that this is an analogue of high quality Full HD video standard. The use of the MTS format can be explained by the fact that, as a rule, cameras record on a removable SDHC memory card, and not on the internal memory of the device, which usually does not happen. This approach provided an opportunity to simplify the design of devices and significantly reduce their size.