SWF to M2TS Converter

Convert SWF to M2TS

M2TS is the MPEG transport stream flavour used on Blu-ray discs and AVCHD camcorders, and it is what set-top boxes, media players and hardware editors tend to accept without argument. This converter reads the video and audio streams embedded in a .swf, re-encodes them, and muxes the result into a .m2ts file. Adobe stopped supporting Flash Player on December 31, 2020 and began blocking Flash content on January 12, 2021, so moving Flash video into a transport stream is a way to get it into equipment that will still play it years from now.

Worth settling before you upload: nothing here emulates the Flash runtime. We decode what is stored in the container, not what ActionScript would have drawn.

How to Convert SWF to M2TS

1. Upload Your SWF File: Drag the .swf onto the page or click "+ Add Files". Several files can be queued and converted with one set of settings.
2. Pick a Video Codec and Audio Codec: Video Codec opens on H.264 and also offers H.265, MPEG-2, MPEG-1, MPEG-4, DivX and Xvid. Audio Codec opens on AAC, with AC3, EAC3, DTS, MP2 and MP3 available — the choice here matters more than it looks (see below).
3. Choose a File Compression mode: Quality Preset is the default, at "Very High (Recommended)". Constant Quality exposes a CRF slider on the 16-51 scale, and Specific file size, Constant Bitrate and Variable Bitrate are all available if you need to hit a number.
4. Convert and Download: Click "Convert" and download the .m2ts. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours — no sign-up, no watermark.

Pick AC3 if a Blu-ray Player Is the Destination

The output really is BDAV-framed: our encoder writes 192-byte packets — a standard 188-byte transport packet with a 4-byte arrival-timestamp prefix in front of it — rather than the plain 188-byte packets you get from a .ts or .mts file. Checking the first bytes of our own output confirms the sync byte 0x47 sitting at offset 4 rather than offset 0, which is exactly the BDAV layout.

That framing is only half of what a Blu-ray player expects, though. AAC is not a legal audio codec for BDAV, and it is what this page selects by default. Blu-ray audio means AC-3, DTS or linear PCM. If the file is destined for a disc-authoring tool or a player that follows the spec strictly, change Audio Codec to AC3 before converting. If it is going into VLC, a PC media player or an NLE, AAC is fine and more efficient.

Even with AC-3 selected, a single .m2ts is a stream file, not a disc. Authoring software will take it as an input and build the BDMV structure around it; simply renaming or copying the file onto a disc will not produce something a player can navigate.

What Comes Out of the Flash File

Every conversion re-encodes; the streams are decoded and compressed again rather than copied across. That costs a generation of quality, so pick the highest Quality Preset you can live with if the result will be edited further.

Frequently Asked Questions

Why does my Flash file fail to convert?

Because it very likely holds no encoded video stream. Most .swf files that survive today are vector timelines — games, banners, menus, cartoons — where the artwork was described as shapes and drawn by the Flash Player at runtime rather than stored as pixels. A converter that reads embedded streams finds nothing to read. Encrypted and anti-decompiler-protected files fail too. A Flash emulator such as the open-source Ruffle is the only route for that kind of file, and you would be capturing its playback rather than converting.

Should I choose M2TS or MP4 for an old Flash video?

MP4, unless something specific requires a transport stream. MP4 is smaller for the same quality, plays on every phone, browser and editor, and is far easier to move around. M2TS earns its place when the destination is Blu-ray authoring, an AVCHD workflow, a broadcast chain, or a set-top box that will not read MP4. For general viewing and sharing, SWF to MP4 is the better answer.

Is the audio kept?

Yes, provided the SWF actually contains an audio stream — it is decoded and re-encoded to your chosen Audio Codec alongside the video. If the Flash file's sound was generated at runtime by ActionScript rather than stored, there is nothing to carry over and the output will have video only. Note that Flash movies frequently contain far less audio than their runtime suggested.

Can I trim the Flash video to just the part I want?

Not from the .swf itself. Flash files are not seekable — there is no index for a decoder to jump into — so asking for a start offset inside a SWF will not land where you expect. Convert the whole movie first, then cut the result, which is a format that seeks properly. Converting whole is also the only way to find the real length, since a SWF header declares a frame count and frame rate instead of a duration.

Which quality mode should I use on this page?

Stay on Quality Preset unless you have a reason not to; it is the default and it behaves sensibly across all the codecs offered here. Switch to Constant Quality if you want to drive the CRF slider directly — on H.264 and H.265 it runs 16-51, where lower means better quality and a larger file, and the low twenties is the usual sweet spot. Reach for Specific file size or a bitrate mode only when you have a hard number to hit, such as a disc capacity.

Will an M2TS from a Flash file look good on a TV?

It will look exactly as good as the Flash video did, which is usually modest. Flash video was authored for small players on dial-up-era connections — frequently 320x240 or 480x360, at low bitrates. Upscaling to 1080p during conversion enlarges the pixels without adding detail and makes the compression artefacts more obvious. Leaving Video resolution on "Keep original" and letting the TV do the scaling generally looks better.

What is the difference between .m2ts, .mts and .ts?

All three carry MPEG transport streams, but the framing differs. A .m2ts file uses 192-byte BDAV packets with a 4-byte timestamp prefix on each one, which is what Blu-ray and AVCHD expect. .ts and .mts files use plain 188-byte packets. Our encoder follows the extension you choose, so requesting .m2ts genuinely produces the BDAV layout rather than a renamed .ts.

Does the M2TS keep any of the Flash interactivity?

None of it. Buttons, links, mouse handling, game logic and anything else driven by ActionScript are properties of the Flash runtime, not of the video. A transport stream is a linear sequence of pictures and sound. If the interactive behaviour is the thing you need to preserve, no video conversion will do it — you need an emulator that runs the original file.

What happens to my SWF file after the conversion?

Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — never shared, never made public, and never used for anything other than producing your download.