Free online HEVC to M2TS converter

What the HEVC format is

HEVC (High Efficiency Video Coding, also called H.265) is a video compression codec, not technically a container format. It provides roughly comparable visual quality at a lower bitrate than H.264, so it is common in 4K recordings, UHD Blu-ray sources, IP cameras, smartphones, screen captures, and downloads.

HEVC video may be stored in .mp4, .mkv, .mov, or a raw .hevc stream. Cameras, OBS Studio, FFmpeg, HandBrake, smartphones, and professional video applications can create files containing HEVC. The filename extension alone does not identify the codec; FFmpeg's ffprobe or MediaInfo can show the video and audio streams inside the file.

What the M2TS format is

M2TS is a filename extension for MPEG-2 Transport Stream files used by Blu-ray video, AVCHD camcorders, and some broadcast and playback systems. It carries video, audio, subtitles, timestamps, and program information in a transport stream designed for continuous playback and error tolerance.

M2TS is useful for Blu-ray authoring workflows, AVCHD-compatible equipment, and players that expect transport-stream input rather than MP4 or MKV. The container can carry several codecs, including H.264, MPEG-2 video, and in some implementations HEVC, but an .m2ts extension does not make a file Blu-ray-compliant. Authoring specifications also restrict resolution, frame rate, bitrate, audio format, and stream layout.

How to convert HEVC to M2TS

FFmpeg provides the most predictable desktop conversion. Install a current FFmpeg build, then inspect the source:

ffprobe input.mp4

Use stream copying when the source already has compatible streams and only the container needs to change:

ffmpeg -i input.mp4 -map 0 -c copy -f mpegts output.m2ts

This is a remux, so it is fast and does not reduce quality. It may fail for unusual input streams, or it may produce an M2TS file that a Blu-ray player rejects because HEVC, AAC, subtitles, or the source parameters are outside that player's supported profile.

For broader hardware compatibility, re-encode the video to H.264 and the audio to AC-3:

ffmpeg -i input.mp4 -map 0:v:0 -map 0:a:0? -c:v libx264 -preset medium -crf 18 -pix_fmt yuv420p -c:a ac3 -b:a 384k -f mpegts output.m2ts

crf 18 gives high-quality H.264 output; increasing the value reduces file size and quality, while decreasing it increases both. Replace input.mp4 with the actual HEVC-containing filename. For a raw stream, use input.hevc, but supply audio separately because a raw HEVC file normally contains video only.

When the target device specifically requires an AVCHD or Blu-ray structure, creating one M2TS file is not enough. Use a Blu-ray or AVCHD authoring application after encoding, because authoring adds playlists, clip metadata, navigation data, and the required directory structure.

For a no-installation conversion, upload the file to 101convert.com and select M2TS as the output format. Browser-based processing may impose file-size, upload-time, or codec limitations; do not use it for confidential recordings unless its handling policy meets your requirements.

Quality and compatibility limits

Remuxing with -c copy preserves the original HEVC video bitstream, but it does not improve compatibility. Re-encoding to H.264 is necessary for devices limited to H.264, and it introduces generation loss and additional processing time.

Check the target specification before choosing settings. Common Blu-ray-compatible workflows use H.264 video with a supported frame rate and level, AAC is often unsuitable for older Blu-ray players, and 4K or HDR HEVC may require UHD Blu-ray-specific authoring rather than standard Blu-ray output. Use MediaInfo or ffprobe to verify resolution, frame rate, audio codec, channel count, and bitrate after conversion.