Trim M2TS

How to Trim M2TS Online

1. Upload Your M2TS File: Drag and drop or click "+ Add Files" to add your Blu-ray rip, AVCHD camcorder file, or BDAV recording. Multiple M2TS files can be queued and trimmed in one session.
2. Set the Time Range: Under "Trim," choose "Time Range" and enter the start time and duration in HH:MM:SS.mmm format. Use a frame-accurate timestamp from a player like VLC or PotPlayer to avoid trimming mid-GOP.
3. Pick a Compression Method (Optional): Under "File Compression," choose "Quality Preset" (Highest, Very High, High, Medium, Low, Very Low, Lowest), "Target file size (%)", "Specific file size," "Constant Bitrate," "Variable Bitrate," "Constant Quality" (CRF 0–51 for H.264/H.265), or "Constraint Quality." Default keeps the source bitrate; raise CRF or lower the percentage to shrink the clip.
4. Adjust Resolution and Trim: Under "Video resolution," keep original, pick a preset (2160p, 1440p, 1080p, 720p, 480p) or enter custom width/height. Click "Trim" — files process in the browser, no sign-up, no watermark.

Why Trim M2TS Files?

M2TS is the BDAV (Blu-ray Disc Audio/Visual) container — a modified MPEG-2 Transport Stream defined in the Blu-ray spec for random-access media. Commercial Blu-ray discs cap at 40 Mbit/s video and 48 Mbit/s combined audio+video, so a feature film often weighs 25–40 GB. AVCHD camcorders from Sony, Panasonic, and Canon (the format was launched July 13, 2006 by Sony and Panasonic; first consumer cams shipped spring 2007) record the same container with H.264 + Dolby Digital, typically at 17–24 Mbit/s for 1080p. Trimming lets you isolate the part you actually need before re-encoding the whole disc.

• Pull a single chapter from a Blu-ray rip — A 30 GB MakeMKV or BD rip becomes a 1–3 GB clip after extracting one scene; combine with "Target file size (%)" at 25% to drop it to a sharable size.
• Clean up AVCHD camcorder footage — Wedding, birthday, and travel cams record continuous takes; trim the dead time at start/end before importing into Resolve, Premiere, or FCP.
• Prepare a clip for review or VFX — Editors often need a 30-second reference cut from a longer master. Keep M2TS to preserve compatibility with Sony Vegas and other Blu-ray-aware tools.
• Shrink high-bitrate Sony/Panasonic 4K — Newer AVCHD-successor cams (XAVC, XAVC S) push 50–100 Mbit/s; trimming with re-encode at CRF 23 cuts file size dramatically while keeping visual quality.
• Extract bonus features or making-of clips — Bonus discs are often split across multiple .m2ts files in BDMV/STREAM/; trim one out without re-authoring the whole disc.
• Build a Blu-ray authoring source — Authoring tools (TMPGEnc, multiAVCHD) prefer compliant M2TS at ≤40 Mbit/s; trimming a longer master to chapter length keeps the workflow clean.

M2TS Containers — Blu-ray BDMV vs AVCHD

Property	Blu-ray BDMV	AVCHD
Filename extension	.m2ts (long names)	.MTS (8.3 names on SDHC/internal)
Video codecs allowed	H.262/MPEG-2, H.264/AVC, SMPTE VC-1	H.264/AVC only
Mandatory audio	Dolby Digital, DTS, LPCM	Dolby Digital (AC-3) or LPCM
Optional audio	Dolby TrueHD, DTS-HD MA, DD+, DTS-HD HRA	None (AC-3/LPCM only)
Typical video bitrate	20–40 Mbit/s (1080p), up to 100+ Mbit/s on UHD BD	17–24 Mbit/s (1080p)
Folder structure	BDMV/STREAM/00001.m2ts	AVCHD/BDMV/STREAM/00001.MTS
Random-access design	Yes (variable-rate TS with arrival timestamps)	Yes (same TS modification)

M2TS Compression Presets — Quick Guide

Method	What it does	Best for
Quality Preset (Highest → Lowest)	Maps to a CRF curve under the hood	Quick re-encode without thinking about numbers
Target file size (%)	Re-encodes to a fraction of the original	Shrinking a 30 GB rip to a 5–8 GB Plex-friendly clip
Specific file size	Picks a bitrate to hit an exact MB/GB target	Fitting under a 25 GB BD-25 or 8 GB email/upload cap
Constant Bitrate (CBR)	Fixed Mbit/s throughout	Streaming or broadcast workflows where buffer is fixed
Variable Bitrate (VBR)	Allocates bits to motion-heavy sections	General-purpose; better quality per byte than CBR
Constant Quality (CRF)	Visually consistent quality, variable size	Archives where you want quality first, size second (CRF 18 ≈ visually transparent for H.264)
Constraint Quality	Caps maximum bitrate while using VBR	Hitting Blu-ray's 40 Mbit/s ceiling without over-shooting

Frequently Asked Questions

Will trimming M2TS preserve Dolby TrueHD or DTS-HD MA audio?

If you re-encode, the high-bitrate lossless tracks (TrueHD, DTS-HD MA, DTS:X, Atmos) get re-muxed or transcoded depending on the chosen audio codec. To keep TrueHD/DTS-HD lossless, many users remux to MKV first (with M2TS to MKV), trim there, then remux back. Standard Dolby Digital (AC-3) tracks survive a re-encode without issue.

Can I trim without re-encoding (lossless cut)?

Browser-based trim performs a re-encode pass to honor the chosen compression and resolution settings. For frame-accurate lossless cutting at GOP boundaries, desktop tools like TsMuxeR, MKVToolNix (after remux), or Smart Cutter ts/ps preserve original streams. xconvert's trim is the right choice when you also want to compress, resize, or change codecs in the same pass.

What's the difference between .m2ts and .MTS?

Both are the same BDAV container. Blu-ray discs use long filenames (00001.m2ts), while AVCHD camcorders writing to SDHC/SDXC card or internal memory use the legacy 8.3 filename convention (00001.MTS). When AVCHD files are imported to a PC, many tools rename them to .m2ts. xconvert handles both — see also Trim MTS and MTS to M2TS.

Why does my M2TS file freeze in Avidemux or other editors?

Lossless audio tracks (Dolby TrueHD, DTS-HD MA) are a known cause of importer hangs in Avidemux, SolveigMM, and similar tools. The standard workaround on the videohelp and makemkv forums is to remux the file to MKV first (preserves streams), edit there, then remux back. xconvert sidesteps this entirely by re-encoding to a clean output, so problem audio tracks don't block the cut.

Should I keep the output as M2TS or convert to MP4?

Keep M2TS for Blu-ray re-authoring, Sony/Panasonic camcorder workflows, or any toolchain that expects BDAV. Convert to MP4 (M2TS to MP4) for sharing, web playback, or mobile devices — MP4 with H.264/AAC plays natively in every browser and on iOS/Android, while M2TS does not.

What's the maximum bitrate I should target for Blu-ray-compliant output?

The Blu-ray specification caps video at 40 Mbit/s and combined audio+video at 48 Mbit/s. If the trimmed file is destined for a custom Blu-ray, set "Constraint Quality" or pick a Constant/Variable Bitrate at or below 40 Mbit/s for video so authoring tools accept it without re-encoding.

Can I trim a 4K UHD Blu-ray M2TS?

Yes — 4K UHD Blu-ray uses the same M2TS container with HEVC (H.265) video at up to ~128 Mbit/s. Upload, trim, and choose H.265/HEVC under the codec section if you want to keep the same codec. Re-encoding 4K HDR is CPU-intensive; expect the trim to take several minutes per minute of source.

What plays a trimmed M2TS file?

VLC, MPC-HC, PotPlayer, Kodi, Plex, and most desktop Blu-ray player software handle M2TS natively. macOS QuickTime requires a third-party component for full audio support; Windows Media Player needs codec packs. For a more universal output, run M2TS to MP4 or Compress M2TS after trimming.

Are uploaded files private?

Files process in your browser session and are removed after processing — no account, no public sharing link, no watermark. For Blu-ray rips of commercial discs, check your local copyright rules before uploading or sharing.