- T&FMTSThe .m2ts is a filename extension used for the BDAV MPEG-2 Transport Stream container file format. It is used for multiplexing audio, video and other streams. It is based on the MPEG-2 transport stream container. This container format is commonly used for high definition video on Blu-ray Disc and AVCHD.OverviewThe BDAV container format is a modification of MPEG-2 transport stream (ITU-T H.222.0 | ISO\/IEC 13818-1) specification for random-access media, such as Blu-ray Disc, DVD, hard drives or solid-state memory cards. It is also informally calledM2TS.The BDAV container format (.m2ts) is a standard used on Blu-ray Discs. Blu-ray Disc titles authored with menu support are in the BDMV (Blu-ray Disc Movie) format and contain audio, video, and other streams in BDAV container (.m2ts), which is based on the MPEG transport stream format. The BDAV container is also used in the BDAV (Blu-ray Disc Audio\/Visual) disc format, the consumer-oriented alternative to the BDMV discs. BDAV disc format is used on BD-RE and BD-R discs for audio\/video recording.The BDAV container with filename extension .MTS or .m2ts is also used in AVCHD format, which is a high definition digital video camera recorder format. AVCHD is a simpler form of the Blu-ray Disc standard with just one video encoding algorithm and two audio encodings. Compared to Blu-ray Disc format, AVCHD can use various storage media, such as DVD media, memory cards or hard disk drives. The BDAV container contains videos recorded using AVCHD camcorders, such as Sony's HDR-SR(xx)series models. Panasonic, Canon and other brands of AVCHD camcorders also store recorded video in BDAV container format. There are some problems with AVCHD compatibility between brands.FormatsThe BDAV container format used on Blu-ray Discs can contain one of the three mandatory supported video compression formats MPEG-2 Part 2, H.264\/MPEG-4 AVC or SMPTE VC-1 and audio compression formats such as Dolby Digital, DTS or uncompressed Linear PCM. Optionally supported audio formats are Dolby Digital Plus, DTS-HD High Resolution Audio and Dolby TrueHD.The BDAV container format used on AVCHD equipment is more restricted and can contain only H.264\/MPEG-4 AVC video compression and Dolby Digital (AC-3) audio compression or uncompressed LPCM audio.File and folder structureThe names of M2TS files are in the form “zzzzz.m2ts”, where “zzzzz” is a 5-digit number corresponding to the audiovisual clip. This number is also used in the filename of an associated clip information file "zzzzz.clpi". (This number can be a date and time stamp of when the video clip was recorded.) Each stream has its own file.Files in AVCHD format use legacy "8.3" file naming convention, while Blu-ray Discs use long filenames. That's why the filename extension of video files is ".MTS" instead of Blu-ray Disc's ".m2ts". Also other files use different extensions: .CPI - .clpi, .MPL - .mpls, .BDM - .bdmv.The M2TS files on a Blu-ray Disc are placed in the subdirectory "STREAM" of "BDMV" (or "BDAV") directory, which is at the root level. (e.g. \\BDMV\\STREAM\\00001.m2ts or \\BDAV\\STREAM\\00001.m2ts) On some AVCHD equipment, the "BDMV" directory is located in the "AVCHD" directory, which is placed at the root level (e.g. \\AVCHD\\BDMV\\STREAM\\00001.MTS).Software supportAlmost all commercially produced Blu-ray Disc titles use copy protection method called Advanced Access Content System, which encrypts content of the disc (including M2TS files). Software that supports M2TS files usually works only with decrypted or unencrypted files. Blu-ray Disc software players can usually play back encrypted content from original disc. Video content created using AVCHD equipment is commonly unencrypted.Currently, M2TS files can be played using the Picture Motion Browser, which is an application video player provided with Sony AVCHD camcorders.Some M2TS files can be played with ALLPlayer, MPlayer, VLC and other media players, depending on used compression formats in a M2TS file. Some players will need an appropriate codec, component or plugin installed. The file type .m2ts is not always automatically associated with the player, so it may be necessary to open it from the player.Current versions of Nero Vision, FormatFactory, Total video converter, MediaCoder, HandBrake and Picture Motion Browser are capable of converting M2TS files into MPEG-4 files, which can also be viewed using the aforementioned media players.Sony products Media Manager PRO for PSP, Media Manager PRO for Walkman, and Mobile Media Manager PRO are all capable of converting M2TS format to MP4 files.M2TS format from Sony is not necessarily the same as that of Panasonic or Canon camcorders. However, programs like Sony Vegas Pro and AVS Video Editor can open and edit both Sony M2TS files as well as Panasonic M2TS files. (Sony Vegas Pro v.9 is also capable of reading and editing M2TS files produced by Canon Vixia Camcorders.) The only other piece of software known currently to handle both types is Pinnacle Studio 12 Ultimate and Cyberlink Power Director v8.M2TS files can also be played on Sony PlayStation 3s, Sony Bravia TVs, Western Digital WDTVs, Xtreamer media player, Amkette FlashTV HD Media Player and Panasonic Viera TVs supporting playback of AVCHD.Apple's Final Cut Pro can read .MTS files (as stored in Sony HDR camcorders) by using the AVCHD plugin in the Log and Transfer window.Daminion Media Management Software allows importing and managing .MTS & M2TS files.M2TSModifications of transport stream specification for random-access media (M2TS)TimecodeTransport Stream had been originally designed for broadcast. Later it was adapted for usage with digital video cameras, recorders and players by adding a 4-byte timecode (TC) to standard 188-byte packets, which resulted in a 192-byte packet. This is what is informally called M2TS stream. Blu-ray Disc Association calls it "BDAV MPEG-2 transport stream". JVC called it TOD (possibly an abbreviation for "Transport stream on disc") when used in HDD-based camcorders like GZ-HD7. M2TS transport stream is also used for to record HDV video (onto tape and onto file-based media), and for AVCHD video files, which often have MTS extension. The timecode allows quick access to any part of the stream either from a media player, or from a non-linear video editing system. It is also used to synchronize video streams from several cameras in a multi-camera shoot.Filename extension .m2ts is used on Blu-ray Disc Video for files which contain BDAV MPEG-2 transport stream. Blu-ray Disc Video titles authored with menu support are in the BDMV (Blu-ray Disc Movie) format and contain audio, video, and other streams in BDAV container, which is based on the MPEG-2 transport stream format. There is also the BDAV (Blu-ray Disc Audio\/Visual) format, the consumer oriented alternative to the BDMV format used for movie releases. The BDAV format is used on BD-REs and BD-Rs for audio\/video recording. Blu-ray Disc employs the MPEG-2 transport stream recording method. That enables transport streams of digital broadcasts to be recorded as they are without altering the format. It also enables flexible editing of a digital broadcast that is recorded as is and where the data can be edited just by rewriting the playback stream. Although it is quite natural, a function for high-speed and easy-to use retrieval is built in. Blu-ray Disc Video use MPEG-2 transport streams, compared to DVD's program streams. This allows multiple video programs to be stored in the same file so they can be played back simultaneously (e.g. with "Picture in picture" effect).
Audio and video glossary. 2014.
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