CONVERT M2TS → Y4M (M2TS to Y4M)
Fast, secure M2TS to Y4M conversion. No registration required.
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HOW TO CONVERT M2TS → Y4M
Upload the M2TS
Drop your M2TS onto the uploader. Files up to 25 MB run on the free tier without registration; paid plans go up to 2 GB.
Stream-copy or re-encode
FFmpeg probes the codecs; if compatible, it stream-copies (no quality loss). Otherwise it transcodes at matching bitrate.
Download the Y4M
Fetch the converted Y4M as soon as it is ready. Both files auto-delete within two hours.
Situation. M2TS is the Blu-ray transport stream container for HD video. Solution: a Y4M, produced below. Repackaging a M2TS file into Y4M is one of the fastest video jobs there is. When the codecs already match the target container specification, the bytes are literally copied across — no re-encoding, no quality drop, no long wait. Upload above and watch the progress bar usually fly. Background. M2TS is the Blu-ray transport stream container for HD video. Destination side, Y4M is a video container, so playback depends on the codec inside as well as the wrapper itself.
Why convert M2TS to Y4M
YUV4MPEG2 is better supported than Blu-ray MPEG-2 TS across web uploads, social networks and consumer devices. Converting trades the niche advantages of M2TS for broad playback and fewer "file type not supported" messages. Stream copy (when codecs match) keeps the video bit-identical to the source.
M2TS vs Y4M — Technical specifications
Side-by-side comparison of the technical details.
M2TS
- MIME type
- video/mp2t
- Extensions
- .m2ts (Blu-ray), .mts (AVCHD)
- Packet size
- 192 bytes (188 TS + 4 BDAV)
- Video codecs
- H.264, HEVC, VC-1
- Audio codecs
- Dolby TrueHD, DTS-HD MA, LPCM, AC-3, DTS
- MIME Type
- video/mp2t
- Extension
- .m2ts
- Category
- Video Files
- Full Name
- Blu-ray MPEG-2 TS
- Conversion Engine
- FFMPEG
Y4M
- MIME type
- video/x-yuv4mpeg2
- MIME Type
- video/x-raw-yuv
- Extension
- .y4m
- Category
- Video Files
- Full Name
- YUV4MPEG2
- Conversion Engine
- FFMPEG
- Pixel format
- YUV 4:2:0, 4:2:2, 4:4:4
- Header
- ASCII single line
| Specification | M2TS | Y4M |
|---|---|---|
| MIME type | video/mp2t | video/x-yuv4mpeg2 |
| Extensions | .m2ts (Blu-ray), .mts (AVCHD) | — |
| Packet size | 192 bytes (188 TS + 4 BDAV) | — |
| Video codecs | H.264, HEVC, VC-1 | — |
| Audio codecs | Dolby TrueHD, DTS-HD MA, LPCM, AC-3, DTS | — |
| MIME Type | video/mp2t | video/x-raw-yuv |
| Extension | .m2ts | .y4m |
| Category | Video Files | Video Files |
| Full Name | Blu-ray MPEG-2 TS | YUV4MPEG2 |
| Conversion Engine | FFMPEG | FFMPEG |
| Pixel format | — | YUV 4:2:0, 4:2:2, 4:4:4 |
| Header | — | ASCII single line |
M2TS vs Y4M — Strengths and limitations
What each format does best, and where it falls short.
M2TS Strengths
- Blu-ray native container — supports H.264, HEVC, VC-1 video.
- Multiple audio tracks (DTS-HD MA, Dolby TrueHD, LPCM).
- Compatible with all Blu-ray players and most media center apps.
- AVCHD backward compatibility for home video archives.
Limitations
- 192-byte packets waste ~2% overhead vs plain TS.
- BDAV headers complicate parsing outside dedicated Blu-ray tools.
- AACS disc-level encryption (on commercial Blu-rays) blocks direct playback until decrypted.
Y4M Strengths
- Uncompressed raw YUV — codec benchmark truth.
- Dead-simple header.
- Universal codec development support.
Limitations
- Enormous file sizes.
- Development-only — not for consumption.
- No metadata beyond basic stream params.
Quality & Compatibility
Stream-copy is bit-perfect: when the codecs inside M2TS match what Y4M can carry, the frames are copied across without re-encoding and the output is visually identical to the source. When transcoding is required, we target CRF 20–23 H.264 — visually transparent for most content — and keep audio bitrate at 192 kbps AAC.
Tips for Best Results
- Stream-copy beats re-encoding by orders of magnitude — check if your M2TS already uses Y4M-compatible codecs before picking Advanced settings.
- For social uploads, 1080p at 30 fps strikes the best quality-to-size ratio; 4K is often downscaled server-side anyway.
- Keep the M2TS if you plan further editing — transcoded Y4M is fine for final delivery but not for intermediate edits.
Frequently Asked Questions
Only when it has to. If the codecs inside M2TS (usually H.264 or H.265 for video, AAC for audio) are accepted by Y4M, we stream-copy — the bytes are repackaged into the new container with zero re-encoding and no quality loss. When the source uses a codec the target does not support, we transcode at a matching bitrate to keep the visual quality close to the original.
With stream copy, expect the job to finish in seconds to tens of seconds regardless of video length — the work is mostly rewriting the container. Transcoding is slower (roughly real-time: a ten-minute clip takes about ten minutes) because every frame must be decoded and re-encoded. The progress bar shows which mode applies.
Yes. Resolution, frame rate, colour space and bit depth are preserved by default; stream copy is literally bit-identical on these parameters. If you explicitly pick a lower bitrate or a different codec in Advanced, the output is rebuilt to those settings, but the default is always "match the source".
Blu-ray MPEG-2 TS
Source formatM2TS is the container used on Blu-ray discs and AVCHD camcorders.
YUV4MPEG2
Target formatYUV4MPEG2 (Y4M) is a simple uncompressed video format that stores raw YUV pixel data with a minimal header. It is widely used as an intermediate format for video processing and quality benchmarking where no compression artifacts are acceptable.
Common Use Cases
Share across platforms
Send Y4M files to anyone without worrying about whether they have the right software for M2TS.
Embed in documents
Drop Y4M output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
Y4M often produces smaller files than M2TS for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
M2TS vs Y4M — Typical file sizes
Approximate file sizes for common scenarios.
- 45-min TV episode (1080p H.264) 2-4 GB
- 2-hour movie (1080p H.264) 20-40 GB
- 2-hour movie (4K HEVC UHD BD) 50-100 GB
- 10 sec 1080p Y4M ~600 MB
- 1 min 4K Y4M ~14 GB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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