M2V file format
M2V is a format that supports video-only storage; accompanying audios or subtitles are stored in separate data files. Though the M2V is not as efficient as newer video storage and transmission standards like AVC and HEVC, it enjoys usage to date due to its backward compatibility with recent video creation technology. M2V was used in its hay days as a format for storing motion pictures; old movie reels can be used on digital TV and more advanced video transmissions technologies like DVD and DVB-S2.
Files with the .m2v extension are referred to as MPEG-2 video stream files. The MPEG-2 is the format of choice for transmitting digital Television signals via cable or satellite TV broadcast. M2V files are hardly seen alone since their source data contains video alone.; hence, accompanying audio, metadata, and subtitle files are included in whatever media where the .m2v file is stored. M2V files are usually seen on DVD-creation tools and programs, combined with other separate items like WAV or AIF files, menus, and video chapter points, to build an intelligible DVD video. Rather than using conventional audio files like .ogg or .wav, some DVD-creation programs utilize the MPEG-1 audio file format.