Add your FLV file
Drop one or more .flv files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
FLV to M2TS
Pulling the soundtrack out of a .flv video into .m2ts audio keeps what you can hear and drops the picture entirely. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop FLV files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting Flash video to Blu-ray transport stream
Pulling the soundtrack out of a .flv video into .m2ts audio keeps what you can hear and drops the picture entirely. An .flv file is a Flash Video container, the format that powered most web video during the 2000s. YouTube, news sites, and early streaming platforms delivered .flv streams into the Flash Player plugin before HTML5 video replaced the whole stack.
An .m2ts file is a BDAV transport stream, the container Blu-ray discs and AVCHD software use for high-definition video. Open a Blu-ray's BDMV/STREAM folder and every title is an .m2ts file pairing H.264, VC-1, or HEVC video with multichannel audio. For this route the practical draw is preserves full disc quality, including lossless audio tracks and seekable and damage-tolerant like every transport stream — balanced against file sizes are very large, often tens of gigabytes per title, which is worth knowing before you commit a large batch.
Why convert FLV to M2TS?
The usual reason to take .m2ts audio out of a .flv file is that only the sound matters — a talk, interview, song, or podcast segment. Keeping the video stream would waste storage, and a dedicated audio file is easier to trim, tag, and play. On the source side, no mainstream player ships FLV support anymore; on the target side, the payoff is preserves full disc quality, including lossless audio tracks, which is exactly what you want for archiving personal Blu-ray projects and camcorder discs.
FLV vs M2TS at a glance
| Aspect | Flash video (.flv) | Blu-ray transport stream (.m2ts) |
|---|---|---|
| Format type | Container — quality depends on the codecs and settings inside | Container — quality depends on the codecs and settings inside |
| How it stores data | a simple sequence of tagged audio, video, and script packets designed for progressive download and RTMP streaming | 192-byte packets whose arrival timestamps enable the precise buffer control disc players require |
| Strongest at | recovering clips downloaded during the Flash era | archiving personal Blu-ray projects and camcorder discs |
| Weak spot | no mainstream player ships FLV support anymore | file sizes are very large, often tens of gigabytes per title |
| Metadata | an onMetaData script tag embeds duration, dimensions, and encoder details; there is no standard field set for titles or authorship | chapter and playlist information lives in separate CLPI and MPLS files on the disc, not inside the .m2ts stream |
Pick M2TS as the output
Select .m2ts in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if M2TS is selectable, the route is real and validated.
Convert on your device
Press Convert. A WebAssembly FFmpeg build demuxes the audio track and re-encodes it locally; the video stream is simply discarded.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid M2TS file. Outputs keep the original filename with the .m2ts extension.
FLV to M2TS questions, answered
Will converting FLV to M2TS lose quality?
Since flv is container-oriented and m2ts is container-oriented, the conversion preserves the source content exactly as stored; no additional compression pass is applied beyond what .m2ts itself requires.
Is it private to convert FLV files here?
Yes — the .flv file is processed inside your browser tab and never uploaded. A WebAssembly FFmpeg build demuxes the audio track and re-encodes it locally; the video stream is simply discarded. Close the tab and the file is gone from memory.
Where will the M2TS file work?
Desktop players such as VLC and MPC-HC play .m2ts smoothly and editing software imports it, but no browser or mobile OS supports the container. Converting to MKV keeps every track, while converting to MP4 favors device compatibility.
Will the M2TS file be bigger or smaller than my FLV?
Much smaller — the video stream is usually 80–95% of a .flv file's weight, and it is discarded entirely. The remaining audio is re-encoded at the bitrate implied by your quality setting.
What happens to the metadata in my FLV file?
This converter strips container metadata deliberately (the FFmpeg command runs with metadata mapping disabled) so exported files do not leak recording details. In the source, an onMetaData script tag embeds duration, dimensions, and encoder details; there is no standard field set for titles or authorship; none of it is transmitted anywhere because the file never leaves your browser.
Can I convert M2TS back to FLV?
Yes — the reverse route exists as a separate tool. Bear in mind that round-tripping .flv → .m2ts → .flv is not a perfect undo when any lossy step is involved; keep your original if fidelity matters.