F4V to WMA Converter

Extract WMA Audio from an F4V

This tool takes the audio track out of an F4V — Adobe's "Flash MP4", a container built on the ISO base media file format — discards the video, and re-encodes the sound as a .wma file using Microsoft's Windows Media Audio codec. It is a double-legacy job: a Flash-era container feeding a Windows-era audio format, so it is worth doing only when something specific insists on .wma. For anything modern, F4V to MP3 or F4V to AAC travels much further, and F4V to MP4 keeps the picture.

WMA Output at a Glance

The F4V Source at a Glance

How to Convert F4V to WMA

1. Upload Your F4V File: Drag and drop your .f4v file onto the page, or click "+ Add Files" to browse. Several files queue and run with the same settings.
2. Confirm the Audio Codec: WMA v2 is preselected under Audio Codec, and it is the right answer for almost every case. WMA v1 is there for genuinely old software that predates v2 support.
3. Choose a Bitrate Mode (Optional): File Compression starts on Quality Preset. Switch to Constant Bitrate to name an exact rate from 8 to 384 kbps, Custom Bitrate to type your own, Variable Bitrate to pick a range, or Specific file size to hit a target size. Trim exports just a section, and Audio Channel and Audio Sample Rate are available if a device is fussy.
4. Convert and Download: Click "Convert" and save your .wma file individually or as a ZIP. No sign-up, no watermark.

Choosing a Bitrate Mode

The F4V's audio is already lossy — AAC or MP3 — so the single most useful rule is to encode the WMA at or above the source's bitrate rather than below it. Encoding a 128 kbps AAC track down to 64 kbps WMA stacks a second, heavier round of loss on the first; encoding it at 128 or 160 kbps keeps the second pass nearly invisible.

• Constant Bitrate is the most predictable choice, and the easiest to match to the source. Pick the nearest step at or above the original rate.
• Custom Bitrate does the same job when the rate you want is not one of the presets.
• Variable Bitrate looks like the quality-first option but is not, for WMA specifically: the codec has no true quality-targeted variable mode here, so the range you pick is applied as an average constant rate. Treat "128k–160k" as roughly "144 kbps average", not as a psychoacoustic quality target.
• Specific file size is the one to use when a size limit, not fidelity, is the constraint — it works backwards from the number you give it and the clip's duration.
• Quality Preset is the starting mode and the least specific; when the result matters, one of the bitrate modes gives you a number you can reason about.

Frequently Asked Questions

What is the difference between WMA v1 and WMA v2, and which one do I get?

You get WMA v2 unless you change it — it is preselected in the Audio Codec group, and it is the more efficient of the two, meaning it sounds better at the same bitrate. WMA v1 is the original bitstream and exists here purely as an escape hatch for software or hardware old enough to predate v2 decoding. If a device rejects your file with a codec error, v1 is worth one attempt; otherwise there is no reason to choose it.

Will I lose quality extracting WMA audio from an F4V?

Some, unavoidably. F4V carries AAC or MP3 audio, both of which are already lossy, and WMA is lossy too — so this is a lossy-to-lossy re-encode and the second pass cannot recover what the first discarded. There is no passthrough option, because WMA cannot carry an AAC or MP3 stream unchanged; the audio is always decoded and re-encoded. The practical mitigation is to match or exceed the source bitrate, which keeps the additional artefacts below what most people notice on ordinary speech and music.

What bitrate should I choose for the WMA?

Match the source, then round up. Most Flash-era F4V recordings carry AAC somewhere between 96 and 192 kbps, so a Constant Bitrate of 128 or 160 kbps is a sensible default for stereo music and comfortably generous for speech. The arithmetic is easy to plan around: a rate in kilobits per second multiplied by the duration in seconds, divided by eight, gives kilobytes — so three minutes at 192 kbps is 192 × 180 ÷ 8 = 4,320 kB, about 4.3 MB. Halve the bitrate and you halve the file, at a real cost in fidelity.

Does the Variable Bitrate setting really vary the bitrate?

Not in the way it does for MP3 or AAC. WMA as implemented here has no true quality-targeted variable mode, so when you pick a range such as 96k–128k, the encoder applies it as an average constant bitrate rather than genuinely spending more bits on complex passages and fewer on quiet ones. That is not a defect in your file — it simply means the mode is a convenient way to express "around this much" rather than a different encoding philosophy. If you want an exact, predictable rate, Constant Bitrate says so plainly.

Will my WMA file play outside Windows?

Assume it will not, and plan accordingly. WMA is a Windows and Windows Media Player format; it does not appear at all in MDN's web audio codec guide, which is a fair signal for how little the modern web platform cares about it. Some cross-platform desktop players and a number of older car stereos and DLNA devices do decode it, but Apple's Music app, most phones and most web players do not. Reserve .wma for the one program or device that demands it, and use F4V to MP3 when the file needs to travel.

Should I change the Audio Sample Rate or Audio Channel?

Choose Original for both unless something is failing. Audio Sample Rate offers 8, 12, 16, 24, 44.1 and 48 kHz alongside Original; downsampling a 44.1 kHz music track to 16 kHz removes the top octaves permanently and only makes sense for voice recordings feeding a device that requires it. Audio Channel offers mono and stereo — folding a stereo track to mono halves the data the encoder has to describe and is a legitimate way to save space on a lecture or interview, but it is irreversible.

What happens to the video track in the F4V?

It is discarded. This page produces an audio-only .wma, so the H.264 picture, any subtitle tracks and any container metadata attached to the video are not carried over. If you meant to keep the video, run F4V to MP4 instead — F4V is already based on the MP4 container family, so that is the closest, most portable target. There is no way to re-attach the picture to a .wma afterwards; you would need to start again from the original file.

How are my files handled, and how long are they kept?

Your F4V is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark on the output, and your files are never shared or made public. On a large batch the practical constraint is upload time rather than a per-file cap — and since only the audio survives, setting a Trim start and duration before converting is the quickest way to move less data.