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Video Format

M2TS

MPEG-2 Transport Stream (Blu-ray)

M2TS files are the video container used on Blu-ray discs — the AVCHD format used by camcorders and the main video format in a Blu-ray disc's BDMV/STREAM/ folder. They contain high-definition H.264 or H.265 video plus lossless audio (DTS-HD Master Audio, Dolby TrueHD) and Blu-ray PGS subtitle streams. Like VOB files for DVD, M2TS files store the actual video data of a Blu-ray.

What is M2TS?

M2TS is the file extension for BDAV MPEG-2 Transport Stream — the container format used by: Blu-ray discs (in the BDMV/STREAM/ folder), AVCHD (Advanced Video Coding High Definition) camcorders (Sony, Canon, Panasonic camcorders from 2006 onward), and the PlayStation 3's video recording functionality. M2TS is based on MPEG-2 Transport Stream (.ts) but with specific extensions for Blu-ray features. A Blu-ray disc's BDMV folder contains: STREAM/ folder with .m2ts video files (typically one large file per movie), CLIPINF/ with .clpi clip information files, BACKUP/ folder, BDJO/, META/, CERTIFICATE/. M2TS files can contain: H.264 AVC at 1080p24, 1080i, or 720p (most Blu-rays), H.265 HEVC at 4K (Ultra HD Blu-ray), Dolby TrueHD (lossless, up to Dolby Atmos), DTS-HD Master Audio (lossless, up to DTS:X), Dolby Digital Plus, linear PCM audio, Blu-ray PGS (Presentation Graphic Stream) subtitles. File sizes are large: a 2-hour movie Blu-ray remux is typically 20-50GB as M2TS. AVCHD camcorder recordings are smaller — a 1-hour 1080p recording might be 10-20GB.

M2TS pros and cons

Advantages

  • Supports Blu-ray lossless audio (Dolby TrueHD, DTS-HD MA)
  • PGS subtitle support (Blu-ray graphic subtitles)
  • Full H.264 and H.265 video quality
  • Native camcorder format for Sony/Canon/Panasonic AVCHD cameras
  • Well-supported by media servers (Plex, Jellyfin) via MKV remux

Limitations

  • Not natively supported on iPhones, Android, or most smart TVs
  • Windows Media Player doesn't support M2TS
  • Very large file sizes for Blu-ray remuxes (20-50GB)
  • AACS DRM on commercial Blu-rays restricts conversion
  • Requires VLC or MPC-HC for playback on Windows/Mac
  • Not accepted by any online video platform

When should you convert M2TS files?

Convert M2TS to MKV for a lossless remux — MKV can contain the same H.264/H.265 video, Dolby TrueHD/DTS-HD audio, and PGS subtitles without re-encoding anything. A Blu-ray remux from M2TS to MKV preserves 100% quality and is supported by all major media servers. Convert M2TS to H.264 MP4 (with AAC audio) for smaller files playable on any device, at the cost of audio downmix (from lossless to AAC) and subtitle handling. Convert AVCHD camcorder M2TS to MP4 for editing in video editors — most NLEs prefer H.264 MP4 for AVCHD footage.

Convert M2TS files

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M2TS FAQ

How do I play M2TS files on Windows?
VLC Media Player plays M2TS files on Windows, including most AVCHD camcorder recordings. MPC-HC (Media Player Classic Home Cinema) with LAV filters also plays M2TS. For Blu-ray remux M2TS (with TrueHD/DTS-HD audio): VLC may not decode all lossless audio types — PowerDVD (paid) or Cyberlink Media Player handle these better.
How do I remux Blu-ray M2TS to MKV without re-encoding?
MakeMKV (free for personal use, makemkv.com) is the standard tool for Blu-ray to MKV remux. It handles AACS decryption on commercial Blu-rays, selects video, audio, and subtitle tracks, and creates an MKV with zero re-encoding. Alternatively: eac3to (command line) + mkvmerge for more control over track selection.

More formats

HEICWebPAVIFEPUBWebMOpusMP3WAVM4AFLACAACMP4AVIMKVMOVJPGPNGGIFSVGTIFFICOBMPEPSARWOGGWMVPPTXPagesPDFDOCXRAWHEVCH.264AIFFM4VWMA3GPDNGRTFPSDOGVTSFLVAIXLSXCSVZIPAPNGMIDIJPEG XLMPG/MPEGVOBAC3ALACDTSJP2HEIFAPECBZ3G2SRTDOCPPTXLSODTODSM3URAR7ZM4BAMRTXTMOBITARGZJSONXMLYAMLKEYMTSCR2NEFMXFTGACAFASSVTTDSFRMF4VWVASFRMVBORFRW2EAC-3TTAISODMGXZDjVuFB2AUM4RAZW3MKAEXRVCFICSAAXPRCMP2SPXXSPFM3U8