The file extension M2TS indicates a file containing data according to the BDAV standard. This can be both video and audio.
The format is mainly used on BluRay discs. It was partially designed to be compatible with the AVCHD standard. AVCHD files, which are still on the storage medium of the recording device (eg camcorder) are usually the extension mts. After importing to the computer, however, the extension M2TS is often used as well.
The files include a transport stream in an MPEG-2 TS based container, video data with a resolution between 720x480 (SD) and 1920x1080 (FullHD) and audio data as PCM (Pulse Code Modulation), AC3 or TrueHD (Dolby Digital) or DTS or DTS-HD (Digital Theater System). In addition, other data streams or multiple video streams may be included. For the compression of the video data usually MPEG 2, VC1 or H.264 is used.
On BluRays, the M2TS files are protected by a digital rights management (DRM) method, usually AACS encrypted.
Most often resolving problems with opening M2TS files is very simple. Just install an appropriate program that supports such files. All of the listed programs support M2TS files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of M2TS files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate M2TS files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the Adobe Flash Professional applications is not on the list, select "Browse" option in order to manually locate the directory where Adobe Flash Professional has been installed.
Sometimes problems with opening M2TS files may not lie with the application itself, but can arise due to other causes, such as: