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M4V - m4v is used in Apple iTunes and iPod. It can be renamed to MP4 file extension. MP4 is a container format. As any other container format like AVI (.avi), RealMedia (.rm, .rmvb), QuickTime (.mov), MPEG (.mpg, .mpeg), Matroska (.mkv, .mka), OGM (.ogm) it allows you to combine different multimedia streams (mostly audio and video) into one single file.

M2T - The M2T file suffix is associated with the video format, called MPEG-2 transport stream. MPEG-2 transport stream file is a standardized container format for audio and video data and is the native media format for Digital Video Broadcast (DVB) standards and Advanced Television Systems Committee (ATSC) standards. MPEG-2 transport stream file format was developed for terrestrial or satellite broadcasting, because it contains error corrections and stream synchronization features, that are useful for transmission integrity, even with bad signal. The maximal resolution of the video is 1080i. Audio is stored in AC-3 Dolby Digital audio format or in Advanced Audio Coding (AAC) format.

M2TS - The M2TS file extension is associated with BDAV MPEG-2 transport stream used on Blu-Ray discs. The BDAV Container format is based on the standard MPEG-2 TS (transport stream) Both Blu-ray and HD DVD use transport streams, compared to DVD's program streams, to store video, audio, and other streams. This allows multiple video programs to be stored in the same file so they can be played back simultaneously, giving a Picture In Picture effect. BDAV was designed in part to provide compatibility between AVCHD digital camcorders and Blu-ray players. It's comparable to the DVD formats used for standalone DVD recorders, DVD+VR and DVD-VR because it's designed primarily for authoring simple Video/Audio content with no menus.

Merge - Merge multiple video files into one master file. This tool allows you to join many files into a single file.

MKA - MKV file extension - The Matroska (MKA) is a free container format based on an open standard. It can hold an unlimited number of video, audio, image or subtitle tracks within a single file. Matroska is intended to serve as a universal format to store common multimedia content such as movies or TV shows. It is conceptually similar to other containers such as AVI, MP4 or ASF but unlike them is completely free. Matroska video files are identified by their MKV extension and those with an MKA extension are audio-only files.

MOV - the QuickTime (.mov) file format functions as a multimedia container file that contains one or more tracks, each of which stores a particular type of data: audio, video, effects, or text (e.g. for subtitles). Each track either contains a digitally-encoded media stream (using a specific codec) or a data reference to the media stream located in another file. Tracks are maintained in a hierarchal data structure consisting of objects called atoms. An atom can be a parent to other atoms or it can contain media or edit data, but it cannot do both.

MP2 - MPEG-1 Audio Layer II (MP2) is a lossy audio compression format defined by ISO/IEC 11172-3 alongside MPEG-1 Audio Layer I and MPEG-1 Audio Layer III (MP3). While MP3 is much more popular for PC and internet applications, MP2 remains a dominant standard for audio broadcasting.

MP3 - MPEG-1 Audio Layer 3, more commonly referred to as MP3, is a patented digital audio encoding format using a form of lossy data compression. It is a common audio format for consumer audio storage, as well as a de facto standard of digital audio compression for the transfer and playback of music on digital audio players. MP3 is an audio-specific format that was designed by the Moving Picture Experts Group as part of its MPEG-1 standard. The use in MP3 of a lossy compression algorithm is designed to greatly reduce the amount of data required to represent the audio recording and still sound like a faithful reproduction of the original uncompressed audio for most listeners.

MP4 - The MP4 extension indicates a file saved in the MPEG-4 multimedia format. As defined in its specification, this format can contain MPEG-4 encoded video and AAC (Advanced Audio Coding) encoded audio. MP4 media files can play in Windows Media Player provided that DirectShow-compatible MPEG-4 decoders are installed. Microsoft decided to improve the format's video compression and has so far released the following MPEG-4 video codecs: Microsoft MPEG-4 v1, Microsoft MPEG-4 v2, Microsoft MPEG-4 v3, ISO MPEG-4 v1.

MPEG (MPG) - The MPEG standard was defined by the Motion Picture Experts Group and later, compliant formats were developed including .mpg, .mpeg, .m1v, .mp2, .mp3, .mpa, .mpe, .mpv2 and .m3u. These formats are still an evolving set of specifications for audio and video compression. The MPEG standard allows to encode progressive video at a transmission rate of about 1.5 million bps (bits per second). The .mpeg format was designed specifically for use with Video-CD and CD-i media. The most common implementation of the MPEG-1 standard allows video resolution of 352x240 at 30 fps (frames per second). MPEG video files usually suffer a slight loss of quality compared to typical VCR videos.

MTS - The MTS file suffix is associated with video files, that are used AVCHD (Advanced Video Coding High Definition) video format. AVCHD video format was developed for tapeless camcorders. Video can ber recorded by camcorder, that is used mediums as DVD, hard disk drive, solid state disk (SSD) or memory cards (SD card, Memory Stick). Developers of the AVCHD are Sony and Panasonic. AVCHD format was introduced in 2006. Now AVCHD video format use camcorder producers such as Sony, Panasonic, Leica, Canon, Hitachi and JVC (JVC uses AVCHD and own video format with file extension TOD). AVCHD video format uses MPEG-4AVC/H.264 (AVC) video coding. Maximal video resolution is 1080p. Audio is coded by Dolby Digital audio AC-3 codec. Some models of professional camcorders support audio in uncompressed linear PCM format. AVCHD video format is designed to be full compatible with Blu-ray Disc video format. AVCHD video can be played in Blu-ray players without other encoding.

Multiplexing - in video editing and processing systems, multiplexing refers to the process of interleaving audio and video into one coherent MPEG transport stream (time-division multiplexing). In digital video, such a transport stream is normally a feature of a container format which may include metadata and other information, such as subtitles. The audio and video streams may have variable bit rate.

Muxer - software that produces a coherent transport stream and/or container for audio, video and text (subtitles) streams is commonly called a statistical multiplexor or muxer.