|
M2TS is a filename extension used for the Blu-ray Disc Audio-Video (BDAV) MPEG-2 Transport Stream (M2TS) container file format. It is used for multiplexing audio, video and other streams. It is based on the MPEG-2 transport stream container.〔Blu-ray Disc Association (March 2005) (BD ROM – Audio Visual Application Format Specifications ) (PDF) Page 15, Retrieved on 2009-07-26. (Archived ) 2009-07-29.〕〔AfterDawn.com (Glossary – BD-MV (Blu-ray Disc Movie) and BDAV container ), Retrieved on 2009-07-26. (Archived ) 2009-07-29.〕〔AfterDawn.com (Glossary – BDAV container ), Retrieved on 2009-07-26〕 This container format is commonly used for high definition video on Blu-ray Disc and AVCHD.〔(【引用サイトリンク】title=VideoHelp Glossary – M2T, m2ts, mts )〕 == Overview == The 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 informally called ''M2TS''. In order to optimize the storage size, the format uses variable rate (VBR) Transport Streams instead of the typical constant rates (CBR) found in MPEG-2 TS broadcast. To be able to reconstruct a T-STD compliant constant rate Transport Stream for playback the arrival timestamp (ATS) of each packet needs to be recorded.〔Doom9.org forum (2006) (New HD Format - AVCHD (By Sony and Panasonic) )〕 The standard MPEG-2 TS 188-byte packet is prefixed with a 4-byte extra header to a total size of 192 bytes. The header consists of a 2-bit copy permission indicator and the 30-bit arrival timestamp with a resolution of 27 MHz.〔Doom9.org forum (2011) (Question about m2ts h264 files )〕 The BDAV container format (.m2ts) is a standard used on Blu-ray Discs.〔Blu-ray Disc Association (August 2004) (Blu-ray Disc Format, White paper ) (PDF) Pages 18 and 22, Retrieved on 2009-07-28〕〔Blu-ray Disc Association (March 2008) (BD RE – Audiovisual Application Format Specification for BD-RE 2.1 ) (PDF), Retrieved on 2009-07-28. (Archived ) 2009-07-29.〕〔Videohelp.com (What is Blu-ray Disc and HD DVD? ), Retrieved on 2009-07-26. (Archived ) 2009-07-29.〕 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.〔〔(【引用サイトリンク】title=Upscale Blu-ray Disc (BDAV) content )〕 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.〔(Backing up AVCHD video onto DVDs and playing them on a Blu-ray Disc player ), Retrieved on 2009-07-27. (Archived ) 2009-07-29.〕 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「.m2ts」の詳細全文を読む スポンサード リンク
|