Y4M to MXF Converter
FileFlip converts Y4M to MXF entirely inside your browser, using FFmpeg compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert a Y4M file to MXF?#
- Drop your Y4M file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to MXF and the conversion starts on its own. FileFlip downloads 30.8 MB of WebAssembly the first time and nothing after that, then runs FFmpeg on your own machine.
- Save the MXF file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting Y4M to MXF lose quality?#
It depends on what is inside the file. Y4M is a container rather than a codec, so whether the MXF conversion copies the streams across untouched or re-encodes them is decided by the codecs that particular file happens to use.
Is it safe to convert Y4M files online?#
Yes, because nothing is uploaded. FileFlip converts Y4M files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What Y4M to MXF actually does to the file#
Converting Y4M to MXF runs on FFmpeg, downloads 30.8 MB of WebAssembly the first time and nothing after that, re-encodes or copies through depending on the codecs in the file, and drops encoded streams.
| Engine | FFmpeg |
|---|---|
| Conversion path | One step: Y4M → MXF |
| Downloaded to your browser | 30.8 MB, once, then cached by your browser |
| Quality | Decided by the codecs inside the file |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| Encoded streams | Dropped | The target format has nowhere to put it. |
What is a Y4M file?#
A Y4M file holds YUV4MPEG2 data, raw uncompressed video frames in planar YCbCr with a short plain-text header, the format codec developers feed into encoders like x264, x265 and vpxenc so nothing but the codec under test touches the pixels.
Use Y4M when testing or comparing video encoders, where the point is to remove every other codec from the pipeline so the one under test is the only variable.
Convert Y4M to a compressed format like MP4 for anything other than encoder testing, since the raw size makes it impractical to store or share.
What is an MXF file?#
An MXF file wraps video, audio and extensive metadata for broadcast and post-production, a SMPTE container designed to move footage between cameras, editing systems and archives without losing timecode, captions or provenance along the way.
Use MXF for broadcast delivery, tapeless camera ingest or any post-production pipeline where downstream tools expect the metadata and operational pattern a plain container cannot carry.
Convert MXF to MP4 or MOV once a project leaves the broadcast or post-production chain, for review copies, web delivery, or anywhere the metadata MXF exists to carry is no longer needed.
Y4M to MXF questions people ask#
Why is a Y4M file so much bigger than the video it represents?
A Y4M file stores every pixel of every frame with no compression at all, unlike MP4 or MKV, which is exactly the point: encoder developers use it as clean, unaltered input so nothing but the codec being tested affects the result. A minute of 1080p footage can run to several gigabytes.
What is Y4M used for?
Y4M is the standard input format for testing and benchmarking video encoders such as x264, x265 and libvpx, because raw, uncompressed frames guarantee the encoder is working from an unaltered source rather than one already degraded by another codec.
Does a Y4M file have sound?
No, Y4M carries video only. It was designed purely as a way to pipe raw frames between video tools, with no provision for an audio track at all.
What is an MXF file used for?
MXF is the file professional cameras, editing systems and broadcasters exchange footage in, because it carries timecode, captions and other production metadata that a consumer container like MP4 has no place to store. Sony XDCAM and Panasonic P2 cameras record directly to MXF, and it is the delivery format most TV stations and streaming platforms require.