CONVERT
M2TS → FLV
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Fast, secure M2TS to FLV conversion. No registration required.
Situation. M2TS is the Blu-ray transport stream container for HD video. Solution: a FLV, produced below. Converting M2TS to FLV changes how the video is packaged without re-recording it. Most M2TS to FLV jobs are about getting the file to open on a platform that refuses the original container — an upload form, a social app, an older media player. KaijuConverter uses FFmpeg to either stream-copy (no re-encoding, zero quality loss) or transcode when codecs differ, and keeps the original M2TS intact. Technical note: M2TS is the Blu-ray transport stream container for HD video. Compare that with FLV is the Adobe Flash Video container, now deprecated but still lingering in archives.
Blu-ray MPEG-2 TS
Source formatM2TS is the container used on Blu-ray discs and AVCHD camcorders.
Flash Video
Target formatFLV was the dominant web video format during the Flash era. While Flash is now deprecated, many legacy video files still exist in FLV format and need conversion to modern formats.
Why convert M2TS to FLV
Flash Video 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.
HOW TO CONVERT
M2TS → FLV
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 FLV
Fetch the converted FLV as soon as it is ready. Both files auto-delete within two hours.
Common Use Cases
Share across platforms
Send FLV files to anyone without worrying about whether they have the right software for M2TS.
Embed in documents
Drop FLV output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
FLV 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 FLV — 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.
FLV Strengths
- Low overhead — the container is extremely compact.
- Designed for streaming — progressive download and seeking work well.
- Decoded natively by Flash Player on every OS for 20 years.
Limitations
- Flash Player is dead — no modern browser can play FLV without conversion.
- Legacy codecs (Sorenson, VP6) are poorly supported in modern tooling.
- Hardware video decoders never added FLV support.
M2TS vs FLV — 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
FLV
- MIME type
- video/x-flv
- Extensions
- .flv, .f4v
- Video codecs
- Sorenson Spark, VP6, H.264 (F4V)
- Audio codecs
- MP3, Nellymoser, AAC
- Status
- Deprecated since December 31, 2020
| Specification | M2TS | FLV |
|---|---|---|
| MIME type | video/mp2t | video/x-flv |
| Extensions | .m2ts (Blu-ray), .mts (AVCHD) | .flv, .f4v |
| Packet size | 192 bytes (188 TS + 4 BDAV) | — |
| Video codecs | H.264, HEVC, VC-1 | Sorenson Spark, VP6, H.264 (F4V) |
| Audio codecs | Dolby TrueHD, DTS-HD MA, LPCM, AC-3, DTS | MP3, Nellymoser, AAC |
| Status | — | Deprecated since December 31, 2020 |
M2TS vs FLV — Typical file sizes
Approximate file sizes for common scenarios.
M2TS
- 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
FLV
- 10-min YouTube 2008-era video 40-80 MB
- 45-min TV show (FLV H.264) 200-500 MB
Quality & Compatibility
Stream-copy is bit-perfect: when the codecs inside M2TS match what FLV 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 FLV-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 FLV 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 FLV, 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".
Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
Secure & Private Conversion
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