M2TS
| Filename extension | .m2ts, .MTS |
|---|---|
| Internet media type | video/MP2T |
| Developed by | Blu-ray Disc Association |
| Type of format | Media container |
| Container for | Audio, video, data |
| Contained by | Blu-ray Disc, AVCHD |
| Extended from | MPEG-2 transport stream (ISO/IEC 13818-1) |
| Open format? | No |
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. This container format is commonly used for high definition video on Blu-ray Disc and AVCHD.
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.
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.
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.
...
Wikipedia